Panagiotis G Ntagiopoulos

Background: Trochlear dysplasia is one of the most consistent anatomic factors that can lead to recurrent patellar dislocations. Various trochleoplasty procedures have been described to treat patellar dislocations in high-grade dysplasia by creating a new congruent trochlea. Purpose: To present the midterm efficacy and outcome of the sulcus-deep...

Purpose: To evaluate the question of whether different arthroscopically confirmed anterior cruciate ligament (ACL) injury patterns have distinctive preoperative findings on clinical examination, instrumented laxity, and magnetic resonance imaging (MRI). Methods: Three hundred consecutive ACL-deficient patients with isolated ACL tears were evalua...

Purpose: The purpose of this study was to evaluate the biomechanical results from the in vitro reconstruction of medial patellofemoral ligament (MPFL) using a navigation-assisted technique on a cadaveric model and its effects on patellar stability and kinematics. The authors investigated the hypothesis that patellar kinematics after reconstruction...

Patellofemoral (PF) disorders are a very special entity in knee practice, and although they are very common to encounter, very often their treatment is cumbersome and time-consuming for both the patient and the surgeon. The cornerstone of most PF pathology is the abnormal tracking of the patella over the trochlea, which may extend from obvious pate...

Partial ACL tears are very important to diagnose preoperatively in order to modify treatment. The diagnosis of partial versus complete ACL tears requires the use of clinical examination, detailed imaging, and the use of instrumented devices that measure laxity. Such efficient devices are modern stress x-rays that compare anterior side-to-side diffe...

In proportion as more detailed understanding of ACL anatomy, more researches have focused on the diagnosis and treatment of symptomatic partial ACL tears. Partial ACL ruptures have been recognized for many years. In ACL reconstruction, preserving the remaining bundle of the ACL in cases of partial ACL injury may have several advantages. Controversy...

Background: Results of anterior cruciate ligament (ACL) reconstruction are traditionally excellent in younger and nonarthritic patients. During the past few decades, people older than 60 years have become more active than ever, with more demanding physical lifestyles. An increase also has been noted in active patients with diagnosed ACL injuries....

Anterior cruciate ligament (ACL) tears are severe injuries that result in knee instability [1], meniscal lesions [2], and, in the long term, knee osteoarthritis [3]. Patients usually describe subjective symptoms of instability as knee pain and giving way especially during activities involving pivoting or in daily life. The presence of these symptom...

In the presence of patellofemoral instability, arthroscopy can be used for the less invasive treatment of certain pathologies. Historically, arthroscopy was only used in the kinematic analysis, for articular cartilage evaluation and for lateral release, but in the last few years, more invasive procedures, such as medial patellofemoral ligament reco...

Trochleoplasty has become more popular because of a better knowledge of knee anatomy and biomechanics. The greater availability of surgical instruments and better imaging of the dysplastic factors are also important. The technical difficulty of the sulcus-deepening trochleoplasty is based on the fact that surgeons aim to reshape what is usually an...

Purpose The purpose of the study was to evaluate the influence of β-tricalcium phosphate (β-TCP) content on absorption rate and osteoconductive behavior of β-TCP/poly-L-lactic acid (PLLA) interference screws for anterior cruciate ligament (ACL) reconstruction. The authors compared two biocomposite β-TCP/PLLA screws containing 30 % (30TCP) and 60 %...

Unlabelled: Trochleoplasty is a surgical procedure, whose goal is to change the abnormal shape of the femoral trochlea in patients with recurrent patellar dislocation. Such surgeries that aim to reshape the articular surface of a bone without damaging it are quite unique in orthopaedic surgery. Although in the beginning, trochleoplasty was reserve...

The design of the trochlear compartment is crucial in patellofemoral arthroplasty (PFA), because 78 % of patients with isolated patellofemoral arthritis present concomitant trochlear dysplasia with patellar maltracking and therefore remain predisposed to post-operative patellar subluxation and dislocation. The study investigated whether current PFA...

Chronic anterior cruciate ligament (ACL) laxity, and in particular rotational laxity associated with a severe positive pivot-shift test (PST), has been associated to the combined damage of the ACL and the posterolateral structures of the knee [6, 26, 32]. Other authors have also recorded possible evidence of damage of these structures along with AC...

The purpose of the present epidemiologic study is to record the radiographic presence of trochlear dysplasia and patella alta in patients who undergo anterior cruciate ligament (ACL) reconstruction as a potential underlying factor for post-operative anterior knee pain (AKP). All consecutive cases of skeletally-mature ACL-deficient knees that would...

Introduction: Patella alta is one of the primary factors of patellofemoral instability and its importance lies in the reduced engagement between patella and trochlea during the early degrees of flexion. The evaluation of patellar height is based on conventional x-rays, CT scan and, more recently, MRI. The objective of this multicentric prospective...

Introduction La patella alta est un des facteurs principaux de l’instabilité fémoro-patellaire. Son importance est liée à un engagement réduit de la patella dans la trochlée pendant les premiers degrés de flexion. L’évaluation de la hauteur patellaire est basée sur des radios conventionnelles, sur le scanner et plus récemment sur l’IRM. L’objectif...

Purpose: Trochleoplasty is a relatively rare operation with few published results and it remains a technically demanding procedure which requires careful patient selection. The ideal candidate for surgery remains to be elucidated, and some authors consider it as a good revision option in cases of previous unsuccessful operations for persisting pat...

Purpose: The study aimed to compare trochlear profiles of various total knee arthroplasty (TKA) models to anatomic profiles observed in healthy and pathologic knees and to evaluate trochlear designs against radiologic indicators for PF disorders and trochlear dysplasia. Methods: The trochlear profiles of 14 different TKA models were digitized us...

Introduction Avec la meilleure connaissance anatomique du ligament croisé antérieur (LCA), le diagnostic de lésion du LCA, partielle ou totale doit être précis pour adapter la planification préopératoire à l’état anatomique. Les mesures instrumentées de la translation tibiale antérieure sont fondamentales pour quantifier l’importance de la laxité d...

Introduction: Our knowledge on anterior cruciate ligament (ACL) pathomechanics has increased. The diagnosis of partial ACL tears must be accurate in order to adjust the operative planning to anatomic status and injury severity. Instrumented measurement of knee laxity is a useful preoperative tool to quantify anterior tibial translation and several...

The study is a prospective case-series analysis to demonstrate a new double bundle technique for anterior cruciate ligament (ACL) reconstruction with the use of hamstring tendons through a single tibial tunnel, a double femoral socket with implant-free femoral fixation and interference screw for tibial fixation. Twenty-one patients were treated wit...

We report the case of an unusual combination of concomitant subcapital and intertrochanteric fractures of the hip in a patient after a motorcycle accident. To the best of our knowledge, there is no previous report in the literature of these conditions as a result of high energy trauma or of the treatment used. A 36-year-old Caucasian man was admitt...

Optimal entry point for antegrade femoral intramedullary nailing (IMN) remains controversial in the current medical literature. The definition of an ideal entry point for femoral IMN would implicate a tenseless introduction of the implant into the canal with anatomical alignment of the bone fragments. This study was undertaken in order to investiga...

Several observational and experimental studies have investigated the potential anabolic effects of statins on undisturbed bone but only a few recent studies have examined the effect of statins on skeletal repair. The goal of the study is to investigate any potential early anabolic effect of the systemic administration of simvastatin in low doses (b...

The "fish-vertebra" sign appears as biconcave lumbar vertebrae with bone softening in lateral and posterior-anterior radiographs of the spine as an exaggeration of the normal concavity of the superior and inferior surfaces of one or more vertebral bodies. This is due to ischaemia of the central growth plate of the spine, and is typically seen in si...

Distal locking is one challenging step during intramedullary nailing of femoral shaft fractures that can lead to an increase of radiation exposure. In the present study, the authors describe a technique for the distal locking of femoral nails, implementing a new targeting device in an attempt to reduce radiation exposure and operational time. Over...

The indications for intramedullary nailing have expanded to include most tibial shaft fractures. Nail design has improved since their first introduction, but distal locking remains a difficult part of the procedure, resulting in radiation exposure to the patient and the surgeon and increased operation time. To address these issues, we describe an a...

The purpose of this study was to investigate the influence of an antibiotic policy programme based on restriction of the empirical use of fluoroquinolones and ceftazidime on the susceptibilities of Gram-negative microorganisms in a general Intensive Care Unit (ICU). The epidemiology of infections caused by the predominant ICU pathogens, i.e. Acinet...

This is a case report about a radiological sign appearing in the spinal x ray of a 58-year-old patient with sickle cell disease (SCD), who presented at the emergency department with lumbar pain. The “fish-vertebra” sign appears as biconcave lumbar vertebrae with bone softening in lateral and posterior–anterior radiographs of the spine as an exagger...

A 28-year old medical doctor presented with a hand injury caused by a broken mercury thermometer .The extensor digiti minimi tendon was ruptured. Operative treatment included debridement and removal of the mercury followed by repair of the tendon. Reoperation was required to excise wound granulomatous reaction from residual droplets of mercury. The...

During invasive mechanical ventilation due to the dryness of medical gases is necessary to provide an adequate level of conditioning. The hot water humidifiers (HWH) heat the water, thus allowing the water vapor to heat and humidify the medical gases. In the common HWH there is a contact between the medical gases and the sterile water, thus increas...