Philippe Neyret

CHU de Lyon - Hôpital de la Croix-Rousse, Lyons, Rhône-Alpes, France

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Publications (250)367.36 Total impact

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    ABSTRACT: Purpose: The purpose of this study was to determine the test-retest reliability and the repeatability over multiple days of a robotic testing device when used to measure laxity of the lower leg during a simulated dial test. Methods: Ten healthy subjects were evaluated using an instrumented robotic lower leg testing system over 4 days. Three testing cycles were performed each day. Each leg was rotated into external and then internal rotation by servomotors until a torque threshold of 5.65 N m was reached. Load-deformation curves were generated from torque and rotation data. Both average-measure and single-measure intraclass correlation coefficients (ICC) were compared across the curves. ICC scores were also compared for features of the curves including: maximum external rotation at -5.65 N m of torque, maximum internal rotation at 5.65 N m of torque, rotation at torque 0, compliance (slope of load-deformation curve) at torque 0, endpoint compliance in external rotation, endpoint compliance in internal rotation, and play at torque 0. Play at torque 0 was defined as the width of the hysteresis curve at torque 0. Results: Average-measure ICC scores and test-retest scores were >0.95 along the entire load-deformation curve except around zero torque. ICC scores at maximum internal and external rotation ranged from 0.87 to 0.99 across the left and right knees. ICC scores for the other features of the curves ranged from 0.61 to 0.98. The standard error of the mean ranged from 0.0497 to 1.1712. Conclusions: The robotic testing device in this study proved to be reliable for testing a subject multiple times both within the same day and over multiple days. These findings suggest that the device can provide a level of reliability in rotational testing that allows for clinical use of test results. Objective laxity data can improve consistency and accuracy in diagnosing knee injuries and may enable more effective treatment.
    Knee Surgery Sports Traumatology Arthroscopy 09/2015; 23(10). DOI:10.1007/s00167-015-3768-4 · 3.05 Impact Factor
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    ABSTRACT: The purpose of this study was to compare the biomechanical characteristics and patient outcomes after either isolated intraarticular ACL reconstruction or intraarticular reconstruction with lateral extra-articular tenodesis. In addition, we aimed to evaluate biomechanical parameters of the entire uninjured, contralateral knee as a baseline during the analysis. Eighteen patients were evaluated at an average of 9.3 years after ACL reconstruction. Twelve patients had an intraarticular reconstruction (BTB), and six had an additional lateral extraarticular procedure (BTB/EAR). Patients were selected for the additional procedure by the operating surgeon based on clinical and radiological criteria. At the time of review, each patient was assessed using subjective patient questionnaires, manual laxity testing, and instrumented laxity testing. Each knee was also evaluated using a robotic lower leg axial rotation testing system. This system measured maximum internal and external rotations at 5.65 Nm of applied torque and generated load deformation curves and compliance data. Pointwise statistical comparisons within each group and between groups were performed using the appropriate paired or unpaired t test. Features were extracted from each load deformation curve for comparative analysis. There were no significant differences between the two groups with respect to the patient satisfaction scores or to laxity testing (manual or instrumented). Robotic testing results for within-group comparisons demonstrated a significant reduction in maximum external rotation (8.77°) in the reconstructed leg when compared to the healthy leg (p < 0.05) in the BTB/EAR group, with a non-significant change in internal rotation. The slope of the curve at maximum internal rotation was also significantly greater in the reconstructed legs for the BTB/EAR group (p < 0.05), indicating reduced endpoint compliance or a harder endpoint. Finally, the leg that received the extra-articular tenodesis had a trend towards a reduced total leg axial rotation. Conversely, patients in the BTB group demonstrated no significant differences between their legs. For between-group comparisons, there was a significant increase in maximum internal rotation in the healthy legs in the BTB/EAR group compared with the healthy legs in the BTB group (p < 0.05). If the injured/reconstructed legs were compared, the significant difference at maximum internal rotation disappeared (p < 0.10). Similarly, the healthy legs in patients in the BTB/EAR group had a significantly more compliant or softer endpoint in internal rotation, greater maximum internal rotation, and more internal rotation at torque 0 in their healthy legs compared with the healthy legs in the BTB group (p < 0.05). These same differences were not noted in the reconstructed knees. The only identifiable significant difference between the injured/reconstructed legs was rotation at 0 torque (p < 0.05). In this group of patients who were at an average of 9 years from surgery, the addition of a lateral extra-articular reconstruction to a standard bone-tendon-bone intraarticular ACL reconstruction does reduces internal rotation of the tibia with respect to the femur when compared to intraarticular reconstruction alone. It appears that the selection process for inclusion into the BTB/EAR group included an increase in total axial rotation of the healthy knee during the examination along with a decrease in endpoint stiffness at maximum internal rotation. II.
    Knee Surgery Sports Traumatology Arthroscopy 09/2015; 23(10). DOI:10.1007/s00167-015-3772-8 · 3.05 Impact Factor
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    ABSTRACT: The purpose of this study is to review the indications for and outcomes of high tibial osteotomy in the treatment of patients with chronic knee laxity. A comprehensive literature review was performed to identify surgical indications and results of high tibial osteotomy for the treatment of chronic knee laxity. Four distinct situations were identified in which a high tibial osteotomy may be advantageous: (1) anterior laxity with varus osteoarthritis, (2) chronic anterior laxity in the setting of varus with lateral ligamentous laxity, (3) chronic anterior laxity in the setting of a high tibial slope, and (4) chronic posterior laxity or posterolateral corner injury. A total of 24 studies were included in this report, including reports of the treatment of 410 knees as well as several review articles. The most frequently reported indication for that addition of HTO was anterior laxity in the setting of varus OA, which was noted to have good results, minimizing anterior knee laxity and allowing return to sports, while reducing the progression of osteoarthritis. More advanced cases in which lateral structures have also become stretched and incompetent are an excellent indication for HTO, with the need for subsequent lateral procedures dependent on the degree of varus laxity and especially hyperextension that is present. Excessive tibial slope has been identified as a cause of ACL reconstruction failure, and some authors have recommended addressing very high slope in revision cases. In knees with chronic posterior or posterolateral instability, correction of alignment first is generally recommended, with subsequent ligamentous procedures performed when instability persists. Knees with chronic instability pose a difficult treatment challenge. In all cases, the contribution of coronal plane alignment to varus-valgus knee stability must be carefully considered and addressed prior to ligament surgery. Sagittal plane alignment is also key and must not be overlooked. Such considerations drive the indication for osteotomy as well as the type of osteotomy that is chosen. Level of evidence IV.
    Knee Surgery Sports Traumatology Arthroscopy 08/2015; 23(10). DOI:10.1007/s00167-015-3752-z · 3.05 Impact Factor
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    A Peltier · T Lording · L Maubisson · R Ballis · P Neyret · S Lustig
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    ABSTRACT: Tears of the posterior horn of the medial meniscus (PHMM) are very common in the ACL-deficient knee. Specific lesions of the PHMM have been described in the setting of ACL rupture: ramp lesions and injuries to the meniscotibial ligament. There are little data available regarding the role these lesions play in knee instability. The aim of this study is to analyse the biomechanical consequences of ramp and meniscotibial ligament lesions on knee stability. Our hypothesis was that these lesions would cause increased instability in the setting of ACL rupture. A cadaveric study was undertaken: ten knees were included for analysis. The biomechanical repercussions of different meniscoligamentous injuries were studied in four stages: stage 1 involved testing the intact knee, stage 2 after transection of the ACL, stage 3 following creation of a ramp lesion, and stage 4 after detachment of the meniscotibial ligament. Four parameters were measured during the experiment: anterior tibial translation under a force of 134 N, internal and external tibial rotation under a torque of 5 Nm, and valgus angulation under a torque of 10 Nm. Measurements were taken in four knee flexion positions: 0° or full extension, 30°, 70°, and 90° of flexion. There was a statistically significant increase in anterior tibial translation for stage 2 (6.8 ± 1.3 mm, p ≤ 0.001), stage 3 (9.4 ± 1.3 mm, p ≤ 0.001), and stage 4 (9.3 ± 1.3 mm, p ≤ 0.001) compared to stage 1. There was no significant difference between stage 2 and stage 3 (2.6 mm, n.s.) or stage 4 (2.5 mm, n.s.). We did, however, demonstrate an increase in anterior tibial translation of 2.6 mm after the creation on a lesion of the PHMM compared to isolated division of the ACL, for all flexion angles combined. There was an increase in internal tibial rotation between stage 1 and stage 4 (3.2° ± 0.7°, p ≤ 0.001) and between stage 2 and stage 4 (2.0° ± 0.7°, p = 0.023). A significant difference was demonstrated for external rotation under 5 Nm torque between stages 4 and 1 (2.2° ± 0.5°, p ≤ 0.001) and between stages 4 and 2 (1.7° ± 0.5°, p = 0.007) for all knee flexion angles combined. No created lesion had a significant effect on medial laxity under a 10-Nm valgus torque at any degree of knee flexion. Lesions of the posterior horn of the medial meniscus are frequent in cases of anterior cruciate ligament rupture. These lesions appear to play a significant role in knee stability. Ramp lesions increase the forces in the ACL, and the PHMM is a secondary restraint to anterior tibial translation. Lesions of the meniscotibial ligament may increase rotatory instability of the knee.
    Knee Surgery Sports Traumatology Arthroscopy 08/2015; DOI:10.1007/s00167-015-3751-0 · 3.05 Impact Factor
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    ABSTRACT: When performing total knee arthroplasty (TKA) in valgus knee deformities, a medial or lateral parapatellar approach can be performed, but the lateral approach is often considered technically more difficult. The purpose of this study was to compare intra-operative, early clinical and radiological outcomes of medial and lateral parapatellar approaches for TKA in the setting of moderate knee valgus (<10°). We prospectively analysed 424 knees with pre-operative valgus deformity between 3° and 10° that underwent TKA over an 18-year period; 109 were treated with a medial approach and 315 with a lateral approach. Intra- and post-operative outcomes and complication rates after a minimum follow-up of one year were compared. Tourniquet (p = 0.25) and surgical (p = 0.62) time were similar between groups. The popliteus tendon was released more frequently in the medial-approach group (p = 0.04), while the iliotibial band was released more frequently in the lateral-approach group (p < 0.001). A tibial tuberosity osteotomy was performed more frequently in the lateral- than medial-approach group (p = 0.003). No significant differences in limb alignment (p = 0.78), or Knee Society Score (KSS) knee (p = 0.32) and function (p = 0.47) results were noted based on surgical approach, and complication rates were similar between groups (p = 0.53). Lateral parapatellar approach is a safe and effective surgical technique for performing TKA in moderately valgus knees. These equivalent early results are encouraging for systematic use of the lateral approach in moderately valgus knees.
    International Orthopaedics 07/2015; DOI:10.1007/s00264-015-2893-5 · 2.11 Impact Factor
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    ABSTRACT: Revision surgery for failed unicompartmental knee arthroplasty (UKA) with bone loss is challenging. Several options are available including cement augmentation, metal augmentation, and bone grafting. The aim of the present study was to describe a surgical technique for lateral tibial plateau autografting and report mid-term outcomes. Eleven consecutive patients (median age 69.5 years) affected by posteromedial tibial plateau collapse after medial UKA were enrolled in the present study. The delay between UKA and revision surgery was 21 months (range 15-36 months). All patients were revised with a cemented posterior-stabilized implant, with a tibial stem. Medial tibial plateau bone loss was treated with an autologous lateral tibial plateau bone graft secured with two absorbable screws. All patients were evaluated with the Oxford Knee Score (OKS), visual analogue scale for pain (VAS), and complete radiographic evaluation. At a median follow-up of 60 months (range 36-84 months), the OKS improved from 21.5 (range 16-26) to 34.5 (range 30-40) (p < 0.01) and the median VAS score improved from 8.0 (range 5-9) to 5.5 (range 3-7) (p < 0.01). No intraoperative complications were recorded. Partial reabsorption of the graft was observed in two cases at final follow-up. Lateral tibial plateau bone autograft is an alternative to metal wedge or cement augments in the treatment of medial plateau collapse after UKA. Primary fixation of the tibial plateau autograft can be achieved with absorbable screws and a tibial-stemmed implant. Further comparative studies with a larger series may be helpful to draw definitive conclusions. Case series, Level IV.
    Knee Surgery Sports Traumatology Arthroscopy 04/2015; DOI:10.1007/s00167-015-3610-z · 3.05 Impact Factor
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    Jonathan Robin · Philippe Neyret
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    ABSTRACT: Patellofemoral instability, also referred to as episodic patella dislocation (EPD), occurs at an incidence of 7 per 100,000 people across all age groups. Many anatomical factors are known to contribute to EPD. The most common of these are trochlea dysplasia and patella alta. Patella alta is increasingly being recognized as a main contributing factor in EPD. This morphologic abnormality exists when the patella is located in an exaggerated proximal position such that it does not engage in the trochlea appropriately. The exact biomechanical mechanism that links patella alta to EPD is unclear, but it is likely to be multifactorial. A delay in patellofemoral contact and engagement predisposes to patella dislocation and potentially increased rates of patellofemoral osteoarthritis. Surgical management of patella alta in the setting of EPD aims to restore patella height and patella tendon length back to normal indices. The goal is to improve patellofemoral engagement and prevent further patella dislocations. The recommended procedures include a distalizing tibial tubercle osteotomy and patella tendon tenodesis, which are frequently combined with other procedures to stabilize the patella. Overall, excellent surgical results have been recorded for these procedures in the short term to medium term.
    Operative Techniques in Sports Medicine 04/2015; 28(2). DOI:10.1053/j.otsm.2015.02.007 · 0.20 Impact Factor
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    ABSTRACT: This study aimed to assess the benefit of using an arthroscopic intercondylar view and a posterior medial viewing portal during anterior cruciate ligament (ACL) reconstruction in the diagnosis of posterior horn of the medial meniscus (PHMM) tears. A secondary objective was to determine clinical and radiological risk factors for the PHMM. Forty-one patients undergoing isolated ACL reconstruction were prospectively evaluated. At ACL reconstruction, the PHMM was assessed using a standard 30° arthroscope in 3 sequential stages: a "classic" anterolateral portal view, an intercondylar view, and a view through a posteromedial portal. Thirty-nine patients were included (12 female patients and 27 male patients). A posteromedial tear of the medial meniscus was found in 17 patients using the anterolateral portal view. The intercondylar view identified 4 new additional lesions and extensions of 3 previously identified lesions. The posteromedial portal view identified 6 new lesions and 5 extensions of known lesions compared with the anterolateral portal view. Two lesions seen through the posteromedial portal were not identified by either the anterolateral portal view or the intercondylar view. Tears of the PHMM may be underdiagnosed by intraoperative assessment using only an anterolateral portal view during ACL reconstruction. The intercondylar view combined with a posteromedial portal aids in the diagnosis of PHMM tears and should be considered in routine ACL reconstruction to assess meniscal status, particularly when the interval from injury to surgery is prolonged. Level IV, therapeutic case series. Copyright © 2015 Arthroscopy Association of North America. Published by Elsevier Inc. All rights reserved.
    Arthroscopy The Journal of Arthroscopic and Related Surgery 02/2015; 31(4). DOI:10.1016/j.arthro.2014.12.003 · 3.21 Impact Factor
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    ABSTRACT: Abstract PURPOSE: While many studies about anterior-cruciate-ligament-deficient (ACLD) patients have demonstrated functional adaptations to protect the knee joint, an increasing number of patients undergo ACL reconstruction (ACLR) surgery in order to return to their desired level of activity. The purpose of this study was to compare 3D kinematic patterns between individuals having undergone ACLR with their healthy contralateral knee and a control group. METHODS: Three-dimensional kinematic data were obtained from 15 patients pre- and post-ACLR, 15 contralateral knees and 15 healthy controls. Data were recorded during treadmill walking at self-selected speed. Flexion/extension, external/internal tibial rotation, adduction/abduction and anterior/posterior tibial translation were compared between groups. RESULTS: ACLR knees showed a significantly higher knee-joint extension during the entire stance phase compared with ACLD knees. However, ACLR knees still showed a deficit of extension compared with healthy control knees. In the axial plane, there was no significant difference in pre- and postoperative kinematic data. Significant difference was achieved between ACLR knees and healthy control knees, specifically between 28 and 34 % and 44 and 54 % of the gait cycle. There was no significant difference in anterior-posterior translation or coronal plane between groups. CONLUSION: Following ACL reconstruction, patients have better clinical and kinematic parameters. Despite improvements, knee kinematics during gait in the ACLR group differed from the control group. These kinematic changes could lead to abnormal loading in the knee joint and initiate the process for future chondral degeneration.
    International Orthopaedics 12/2014; 39(6). DOI:10.1007/s00264-014-2643-0 · 2.11 Impact Factor
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    ABSTRACT: Dear Editor,We appreciate the valuable comments and constructive suggestions regarding our paper. We have carefully considered the comments and respond accordingly [1].The femoral mechanical axis is represented by the line passing through the centre of the femoral head and the middle of the tibial spines. The angle described in our study represents the angle between this axis and the tangent line of the femoral condyles. The tibial mechanical axis is represented by the line passing by the middle of the tibial spines and the middle of the tibial plafond. The angle described in our study represents the angle between this axis and the tangent line of the healthy tibial plateau. This method allows evaluation of the extra-articular part of the deformity. We can also use the Dejour and Levigne method to measure the tibial epiphyseal angle [2]. The mechanical femorotibial axis is the angle between the two aforementioned axes.Indeed, we have not completely described the surgical technique. ...
    International Orthopaedics 12/2014; 39(3). DOI:10.1007/s00264-014-2625-2 · 2.11 Impact Factor
  • A. Darnis · V. Villa · C. Debette · S. Lustig · E. Servien · P. Neyret
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    ABSTRACT: L’ostéotomie tibiale de valgisation par soustraction latérale est une option thérapeutique dans le traitement de l’arthrose fémoro-tibiale médiale isolée sur genu varum. Les complications vasculaires liées à cette chirurgie sont rares mais l’utilisation de la scie oscillante ou de l’ostéotome sont incriminées dans la survenue de cette complication. Il est important de connaître les étapes de cette intervention présentant un risque vasculaire et les précautions à prendre dans le but de diminuer ce risque.
    Revue de Chirurgie Orthopédique et Traumatologique 12/2014; 100(8-8):640-643. DOI:10.1016/j.rcot.2014.08.003
  • A Darnis · V Villa · C Debette · S Lustig · E Servien · P Neyret
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    ABSTRACT: Closing-wedge high tibial osteotomy is a surgical option for patients with isolated medial compartment osteoarthritis and varus knee alignment. Vascular complications are rare, but incriminate the use of oscillating saw or osteotome. It is important to know the steps of this surgery that involve risk of vascular injury and what to do to decrease that risk. Performing the distal osteotomy cut using an oscillating saw is a step with high risk of vascular injury. A protective device behind the tibia may decrease this risk. In this descriptive angiographic cadaver study, closing-wedge high tibial osteotomy was performed on 6 cadaveric knees in 90° knee flexion, and the distance between the surgical instrument and the popliteal artery was measured on fluoroscopy with artery opacification at the various steps of surgery. Tibial osteotomy with oscillating saw involves high vascular risk: the mean distance between the saw-blade and the popliteal artery is 10.6mm in 90° knee flexion. Using a specific device placed behind the tibia protects the vascular structures. High tibial osteotomy is indicated in medial compartment osteoarthritis of the knee and can be performed by closing or opening-wedge. Vascular injuries in closing-wedge osteotomy exist and it is recommended to perform this surgery at 90° knee flexion, although some studies report that this does not move the artery out of the way. A risk of vascular lesion should be kept in mind. The oscillation of the saw and the direction of the osteotomy should also be taken into consideration when performing a closing-wedge high tibial osteotomy in order to protect the popliteal artery. Descriptive cadaver study. Level IV. Copyright © 2014 Elsevier Masson SAS. All rights reserved.
    Orthopaedics & Traumatology Surgery & Research 11/2014; 100(8). DOI:10.1016/j.otsr.2014.07.021 · 1.26 Impact Factor
  • Revue de Chirurgie Orthopédique et Traumatologique 11/2014; 100(7):S274. DOI:10.1016/j.rcot.2014.09.154
  • A Madelaine · T Lording · V Villa · S Lustig · E Servien · P Neyret
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    ABSTRACT: Purpose: Varisation distal femoral osteotomy is a well-described treatment for lateral compartment arthrosis in the young, active patient. This treatment may potentially alter the length of the lower limb . The objective of this study was to quantify the change in leg length following lateral opening wedge distal femoral osteotomy using a blade plate. Methods: Between 1998 and 2011, 29 lateral opening wedge distal femoral osteotomies were performed for symptomatic genu valgum with signs of lateral compartment arthrosis or patello-femoral symptoms. The mean age was 44.4 years (±11.3). Average follow-up was 80.2 months (±50.6). Results: The mean osteotomy opening was 8.3° (±2.3). The femoro-tibial mechanical axis (mFTA) was improved significantly, from 187.8° (±3.5) to 180.4° (±2.6) post-operatively (p < 0.001). The pre-operative leg length discrepancy was -0.7 cm, compared to -0.6 cm post-operatively, which was not significant (n.s.). There were five revisions to arthroplasty for disease progression at meantime of 166.6 months post-operatively. The probability of survival at 60 months was 91.4 % (95 % CI 74.9-100 %) with end-point of revision to total knee arthroplasty and 87.6 % (95 % CI 74.1-100 %) of revision for complications. Conclusions: Lateral opening wedge distal femoral osteotomy, performed for symptomatic genu valgum, has no effect on leg length. This technique allows good correction of the axis of the lower limb; however, the complication rate is not insignificant (14 %). Complications occurred mainly in post-traumatic cases and may be avoidable with attention to technique and optimum rehabilitation. The procedure should be reserved for young, active patients with significant symptoms. LEVEL OF EVIDENCE: IV.
    Knee Surgery Sports Traumatology Arthroscopy 10/2014; DOI:10.1007/s00167-014-3387-5 · 3.05 Impact Factor
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    ABSTRACT: Introduction En novembre 2011, la Knee Society publiait le nouveau score IKS, évaluant avant et après la prothèse totale de genou (PTG), les données cliniques objectives, mais aussi les attentes des patients, leur satisfaction, et la fonction du genou à travers des activités physiques variées. Nous avons entrepris son adaptation transculturelle en langue française selon les recommandations actuelles. Hypothèse Le nouveau score IKS adapté en français est un score cohérent, faisable, fiable et discriminant. Matériel et méthodes Une étude bicentrique a permis de recruter 80 patients présentant une arthrose de genou, répartis en un groupe de 40 patients avec indication de PTG et un groupe de 40 patients avec indication de traitement médical. Le nouveau score IKS, après une étape de traduction/contre-traduction, était comparé à trois autres scores validés : le KOOS, l’AMIQUAL et le SF-12 afin d’évaluer la validité de construit, la capacité discriminante, la faisabilité à travers le taux de réponse et l’existence d’un effet plancher ou plafond, la cohérence interne à l’aide du coefficient alpha de Cronbach, et la fiabilité à travers la reproductibilité et la sensibilité au changement. Résultats Deux cas ont été éliminés pour cause de données manquantes. On observait un score discriminant, un taux de réponse proche de 100 %, l’existence d’un effet plafond pour le domaine « attentes », un coefficient alpha de Cronbach satisfaisant, une reproductibilité excellente, et une bonne sensibilité au changement. Discussion Ces résultats confirment que le nouveau score IKS est fiable, faisable, discriminant, cohérent et sensible au changement. Son originalité tient aux domaines « attentes » et « satisfaction », à sa présentation sous forme de questionnaire auto-administré et à l’évaluation de la fonction dans le cadre d’activités diverses. Niveau de preuve Type d’étude : niveau III.
    Revue de Chirurgie Orthopédique et Traumatologique 09/2014; 100(5):387–391. DOI:10.1016/j.rcot.2014.07.001
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    ABSTRACT: Introduction In November 2011, the Knee Society published its new KSS score to evaluate objective clinical data and also patient expectations, satisfaction and knee function during various physical activities before and after total knee arthroplasty (TKA). We undertook the French cross-cultural adaptation of this scoring system according to current recommendations. Hypothesis The French version of the new KSS score is a consistent, feasible, reliable and discriminating score. Patients and methods Eighty patients with knee osteoarthritis were recruited from two centers: one group of 40 patients had a TKA indication, while the other group of 40 patients had an indication for conservative treatment. After the new KSS score was translated and back-translated, it was compared to three other validated instruments (KOOS, AMIQUAL and SF-12) to determine construct validity, discriminating power, feasibility in terms of response rate and existence of floor or ceiling effect, internal consistency with Chronbach's alpha and reliability based on reproducibility and sensitivity to change (responsiveness). Results Due to missing data, two cases were eliminated. We found that the score could discriminate between groups; it had a nearly 100% response rate, a ceiling effect in the “expectations” domain, satisfactory Chronbach's alpha, excellent reproducibility and good responsiveness. Discussion These results confirm that the French version of the new KSS score is reliable, feasible, discriminating, consistent and responsive. The novelty of this scoring system resides in the “expectations” and “satisfaction” domains, its availability as a self-assessment questionnaire and the evaluation of function during various activities. Level of proof, type of study Level III.
    Orthopaedics & Traumatology Surgery & Research 09/2014; 100(5). DOI:10.1016/j.otsr.2014.03.025 · 1.26 Impact Factor
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    ABSTRACT: Introduction: The literature results of unicompartmental knee arthroplasty (UKA) for isolated lateral osteoarthritis (OA) are not as good as for isolated medial OA. In 1988 our department started using a UKA with a fixed, all polyethylene tibial component and a resurfacing femoral component. The aim of this retrospective study is to report on the progression of medial OA and the long term results of this prosthesis implanted for isolated lateral OA, at a minimum follow up of ten years. Materials and methods: From January 1988 to October 2003, we performed 54 lateral UKAs in 52 patients. All patients had isolated lateral OA, which was post-traumatic in three cases. The mean age at the time of the index procedure was 72.2 ± 15.2 years. Forty-six UKAs in 44 patients were available for follow-up. The mean duration of follow-up was 14.2 years (minimum ten years; range 10.2-18 years). Results: At final follow-up, seven had undergone a second operation, three were revised to total knee arthroplasty (TKA), three had medial UKAs implanted for progression of medial disease, and one was converted to TKA for tibial tray malpositioning. No revision surgery was necessary for wear, infection or progression of patellofemoral OA. The mean Knee Society Score (KSS) knee score was 95.1 points and mean KSS function score was 82.2 points. The mean range of motion was 132.6° (range, 115-150°). Implant survival was 94.4% at ten years and 91.4% at 15 years. Conclusion: The use of a UKA with a fixed, all polyethylene tibial bearing and a femoral resurfacing implant is a reliable option for the management of isolated lateral knee osteoarthritis. We have demonstrated excellent functional results and implant survival in the long term. The most significant factor leading to reoperation is progression of medial disease.
    The Knee 09/2014; 21 Suppl 1:S26-32. DOI:10.1016/S0968-0160(14)50006-3 · 1.94 Impact Factor
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    ABSTRACT: Purpose: Medial structures repair is a well-established approach in the treatment for patellar instability. However, the literature is confusing concerning the indications for surgery, the different surgical techniques and outcomes. The goal of this systematic review was to clarify the indications for medial structures repair and to analyse the results of both arthroscopic and open techniques. Methods: A comprehensive literature review was performed using the keywords 'patellar instability', 'medial capsule reefing' and 'medial capsule plication' with no limit regarding the year of publication. All the selected articles in Anglo-Saxon language were evaluated with the Coleman methodology score. Results: Seventeen full-text articles were evaluated. Initial cohort included 617 patients. About 569 patients were reviewed at an average FU of 54.6 months (range 2-165 months) after medial structures repair. Average age at the time of surgery was 21.2 years (range 9-65 years). The indications for surgery included both patellar subluxation and dislocation (acute or chronic). Average Kujala score increased from 55 to 84 at the last FU, and in the same way average Lysholm score increased from 41.2 to 80.5, whereas average Tegner score increased from 3 to 5.3 and IKDC score from 47.8 to 75.1. Re-dislocation rate among the series was 6.1%. Average Coleman methodology score was 61.6 (range 17-92). Conclusion: From this review, it emerges that medial capsule reefing is a reliable option in the treatment for patellar instability. It can be proposed with good expectations, since the outcomes are positive and stable even at longer FU and complications rates are low. Re-dislocation rate is variable and can occur in up to one-third of patients. However, most of the available studies are case series, and comparison of the series is hard since they widely differ in inclusion criteria and indications, surgical technique and additional procedures, and outcome measures.
    Knee Surgery Sports Traumatology Arthroscopy 07/2014; 22(10). DOI:10.1007/s00167-014-3171-6 · 3.05 Impact Factor
  • B Shabani · D Bytyqi · S Lustig · L Cheze · C Bytyqi · P Neyret
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    ABSTRACT: Purpose: Static, one-dimensional testing cannot predict the behaviour of the anterior cruciate ligament (ACL)-deficient knee under realistic loading conditions. Currently, the most widely accepted method for assessing joint movement patterns is gait analysis. The purpose of the study was in vivo evaluation of the behaviour of the anterior cruciate ligament-deficient (ACLD) knees during walking, using 3D, real-time assessment tool. Methods: Biomechanical data were collected prospectively on 30 patients with ACL rupture and 15 healthy subjects as a control group, with KneeKg™ System. Kinematic data were recorded in vivo during treadmill walking at self-selected speed. Flexion/extension, abduction/adduction, anterior/posterior tibial translation and external/internal tibial rotation were compared between groups. Results: The ACLD patients showed a significant lower extension of the knee joint during stance phase (p < 0.05; 13.2° ± 2.1° and 7.3° ± 2.7°, for ACLD and control group, respectively). A significant difference in tibial rotation angle was found in ACLD knees compared to control knees (p < 0.05). The patients with ACLD rotated the tibia more internally (-1.4° ± 0.2°) during the mid-stance phase, than control group (0.2° ± 0.3°). There was no significant difference in anteroposterior translation and adduction-abduction angles. Conclusion: Significant alterations of joint kinematics in the ACLD knee were revealed in this study by manifesting a higher flexion gait strategy and excessive internal tibial rotation during walking that could result in a more rapid cartilage thinning throughout the knee. The preoperative data obtained in this study will be useful to understand the post-ACL reconstruction kinematic behaviour of the knee. Clinical relevance: The findings in this study indicate that ACLD knee may adapt functionally to prevent excessive anterior-posterior translation but they fail to avoid rotational instability.
    Knee Surgery Sports Traumatology Arthroscopy 07/2014; DOI:10.1007/s00167-014-3169-0 · 3.05 Impact Factor
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    ABSTRACT: Purpose Long-term survival in total knee arthroplasty (TKA) depends on multiple factors, including restoration of mechanical alignment and obtaining optimal ligament balance. The aim of this study was to document the results of single-stage TKA combined with high tibial osteotomy for managing femorotibial arthrosis with significant frontal-plane deformity. Methods Patients with osteoarthritis of the knee and extra-articular deformity in > 10° and operated between 1997 and 2001 were reviewed retrospectively. In each case, a high tibial osteotomy combined with a posterior stabilised TKA was performed. Patients were assessed using the Knee Society Score (KSS). The femorotibial mechanical angle was measured on radiographs pre- and postoperatively and at the most recent follow-up. Results Fifteen knees in 12 patients were included in the study. Mean age was 68.2; average follow-up was 78 months (22.1–145.9). The KSS improved significantly from 47.1 (28–58) to 60.7 (40–94) points (p
    International Orthopaedics 06/2014; 38(10). DOI:10.1007/s00264-014-2420-0 · 2.11 Impact Factor

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3k Citations
367.36 Total Impact Points


  • 1999–2015
    • CHU de Lyon - Hôpital de la Croix-Rousse
      Lyons, Rhône-Alpes, France
  • 2011–2014
    • University of Lyon
      Lyons, Rhône-Alpes, France
    • Imperial College London
      Londinium, England, United Kingdom
  • 2007–2014
    • Hospices Civils de Lyon
      Lyons, Rhône-Alpes, France
  • 2004–2013
    • Centre Hospitalier Universitaire de Lyon
      Lyons, Rhône-Alpes, France
  • 2012
    • HCL
      Noida, Uttar Pradesh, India
  • 2011–2012
    • CHU de Lyon - Groupement Hospitalier Edouard Herriot
      Lyons, Rhône-Alpes, France
  • 2010
    • University of Lille Nord de France
      Lille, Nord-Pas-de-Calais, France
    • Centre Hospitalier Universitaire de Toulouse
      Tolosa de Llenguadoc, Midi-Pyrénées, France
  • 2008
    • Centre Hospitalier Universitaire de Brest
      • Services de chirurgie orthopédique et de traumatologie
      Brest, Brittany, France
  • 1988–1994
    • Centre Hospitalier Lyon Sud
      Lyons, Rhône-Alpes, France