Lars Engebretsen

Lars Engebretsen
University of Oslo · Department of Orthopaedics (ORTHO)

MD PhD

About

693
Publications
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Publications

Publications (693)
Article
Objectives The purpose of this study was to compare clinical outcomes between randomized groups who underwent MCL augmentation repair versus MCL autograft reconstruction. Methods Patients were prospectively enrolled from 2013 to 2019 from 3 centers (United States, Norway, Denmark). Grade III superficial (sMCL) injuries were confirmed by stress rad...
Article
Full-text available
Background:. Anterior cruciate ligament (ACL) injury is considered a risk factor for osteoarthritis. The primary aim of the present study was to investigate the cumulative risk of, and risk factors associated with, a subsequent knee arthroplasty after an ACL reconstruction at up to 15 years of follow-up. The secondary aim was to compare the relativ...
Article
Acute respiratory illness (ARill) is common and threatens the health of athletes. ARill in athletes forms a significant component of the work of Sport and Exercise Medicine (SEM) clinicians. The aim of this consensus is to provide the SEM clinician with an overview and practical clinical approach to non-infective ARill in athletes. The Internationa...
Article
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Background The Norwegian Knee Ligament Register was founded in 2004 to provide representative and reliable data on cruciate ligament surgery. The aim of this study was to evaluate the validity of key variables in the Norwegian Knee Ligament Register to reveal and prevent systematic errors or incompleteness, which can lead to biased reports and stud...
Article
Coronal plane alignment deformities of the lower extremity are often neglected in the evaluation and treatment of chronic posteromedial (PMC) and posterolateral corner (PLC) injuries. Genu varus, valgum, and recurvatum deformities can increase the likelihood of graft failure following knee ligament reconstruction. Abnormal and excessive vector forc...
Article
Background: Although previous studies have reported good short-term results for superficial medial collateral ligament (sMCL) reconstruction, whether an augmented MCL repair is clinically equivalent remains unclear. Purpose/Hypothesis: The purpose of this study was to compare clinical outcomes between randomized groups that underwent sMCL augmenta...
Article
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Purpose External validation of machine learning predictive models is achieved through evaluation of model performance on different groups of patients than were used for algorithm development. This important step is uncommonly performed, inhibiting clinical translation of newly developed models. Machine learning analysis of the Norwegian Knee Ligame...
Article
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Objectives Accurate prediction of outcome following anterior cruciate ligament (ACL) reconstruction is challenging and machine learning has the potential to improve our predictive capability. The purpose of this study was to determine if machine learning analysis of the Norwegian Knee Ligament Register (NKLR) can: (1) identify the most important ri...
Chapter
In the history of anterior cruciate ligament (ACL) surgery, ACL repair was the first surgical ligament procedure attempted to restore knee stability. The first repair was reported in 1895. In the early twentieth century, only a few reports were available on the outcome of surgical repair. The interest of ACL suture was increased because of pioneers...
Article
Objectives To define incidence and injury patterns of International Ski Federation (FIS) World Cup (WC) women ski jumpers over three seasons. Methods Ski jump athletes competing in the Women’s FIS WC were recruited for prospective injury surveillance from 2017–2018 to 2019–2020. Team representatives recruited the athletes annually and prospectivel...
Article
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Paediatric and adolescent ACL injuries are an emerging health burden, increasing at a higher rate than in adults. They compromise quality of life, affect knee structure and function, lead to the early development of osteoarthritis and are a serious economic burden due to shortened professional careers and subsequent surgeries. Up to 35% of children...
Conference Paper
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Background Elite athletes are exposed to high physiological training and competition loads and associated increased injury risk. While there is a wealth of evidence reporting the prevalence of injuries seasonally and during major games events, there are few studies examining injury risk across an elite athlete’s entire sporting-career. Objective R...
Conference Paper
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Background There are numerous studies describing elite athlete injury patterns seasonally and during major sporting events, however little is known about injury patterns during an elite athlete’s entire sporting career. Objective To describe Olympic-career related significant (≥30 days duration) injuries. Design Cross-sectional survey. Setting T...
Conference Paper
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Background The incidence of paediatric anterior cruciate ligament (ACL) reconstructions is increasing in the USA and Australia, but the incidence in Norway is unknown. The health burden regarding short- and long-term complications from ACL injury is high, and there are also risks of complications associated with reconstructions. Objective The prim...
Conference Paper
Background Cervical musculature function (strength, endurance, and proprioception) may be a modifiable risk factor for concussion in contact sports. The ability to enhance neck function and reduce concussive risk needs to be determined. Objective To assess the efficacy of a training programme to enhance neck function and lower match concussion inj...
Conference Paper
Background Injury incidence in professional rugby union tends to be greater than other team sports. Epidemiological studies are required to describe injury occurrence and inform injury prevention measures. Objective To analyse injuries sustained by professional rugby union players in Scotland. Design Prospective observational. Setting Time-loss...
Article
Full-text available
Background Increased knowledge of the factors predicting outcome after anterior cruciate ligament reconstruction (ACLR) is needed. Purpose To determine the effect of concomitant meniscal lesions, and the surgical management thereof, on patient-reported outcomes 5 years after ACLR. Study Design Prospective cohort study; Level of evidence, 2. Meth...
Article
Background: Several factors are associated with an increased risk of anterior cruciate ligament (ACL) reconstruction revision. However, the ability to accurately translate these factors into a quantifiable risk of revision at a patient-specific level has remained elusive. We sought to determine if machine learning analysis of the Norwegian Knee Li...
Article
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Background Patellofemoral joint (PFJ) disease is a common ailment in elite athletes. Our aim is to report the frequency of superolateral Hoffa’s fat pad (SHFP) edema, and PFJ cartilage damage and bone marrow lesions (BML), among Olympian athletes, and to study the association between measurements of trochlear morphology and vertical patellar positi...
Article
PurposeDespite increasing interest in utilizing quadriceps tendon (QT) grafts in anterior cruciate ligament reconstruction (ACLR), data on the optimal quadriceps graft thickness are limited. The purpose of this study was to characterize the mechanical properties for the quadriceps tendon, comparing full-thickness (FT) QT grafts with and without bon...
Article
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Background A detailed understanding of the anatomy of the quadriceps tendon (QT) is clinically relevant, owing to its increased use as a graft in anterior cruciate ligament reconstruction. Purpose To qualitatively and quantitatively describe the anatomy of the QT in younger adult specimens. Study Design Descriptive laboratory study. Methods A to...
Article
Objective To describe the frequency and severity of magnetic resonance imaging (MRI) based peripheral osteoarthritis (OA) in athletes during the Rio de Janeiro 2016 Olympic Games. Methods All MRIs of the peripheral joints in Olympic athletes, performed at the centralized imaging facility, either following acute trauma or for non-traumatic joint pa...
Article
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Background Patients and clinicians often struggle to choose the optimal management strategy for posttraumatic knee osteoarthritis (OA) after an anterior cruciate ligament (ACL) injury. An evaluation of radiographic outcomes after a decision-making and treatment algorithm applicable in clinical practice can help to inform future recommendations and...
Article
Objectives To assess the implementation, limited efficacy, and acceptability of the BEAST (better and safer return to sport) tool – a rehabilitation and return-to-sport (RTS) decision tool after anterior cruciate ligament reconstruction (ACLR) in nonprofessional athletes. Design Prospective cohort. Participants 43 nonprofessional pivoting sport a...
Article
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Objectives To evaluate the self-reported incidence of sleep disturbances, defined as ≤7 hours of sleep per 24-hour period, in patients undergoing arthroscopic-assisted knee surgery. Methods Patients who underwent arthroscopic knee surgery over the course of a 4-month period were prospectively included. Patients were excluded if a history of insomn...
Article
PurposeSurgery performed in low-volume centres has been associated with longer operating time, longer hospital stays, lower functional outcomes, and higher rates of revision surgery, complications and mortality. This has been reported consistently in the arthroplasty literature, but there is a paucity of data regarding the relationship between surg...
Article
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Background: Traumatic and chronic overuse injuries of the wrist are common in athletes. The purpose of this study was to describe the frequency, anatomic distribution, and severity of MRI-detected wrist joint injuries amongst athletes who competed in the Rio de Janeiro 2016 Summer Olympics. Methods: All sports injuries reported by the National O...
Article
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Objective To evaluate muscle strength changes following partial meniscectomy or exercise therapy for degenerative meniscal tears and the relationship between baseline muscle strength and osteoarthritis progression. Methods Secondary analysis of a randomized trial (n=140 participants). Isokinetic quadriceps and hamstrings strength (peak torque [N·m...
Article
Reconstruction of the anterior cruciate ligament (ACL) is one of the most common surgical procedures in orthopaedic sports medicine. Despite this, graft selection remains controversial with various regional, institutional, and individual preferences and trends. The traditional autograft options for reconstruction have been hamstring tendon and bone...
Article
Background: Anterior cruciate ligament (ACL) injuries can be treated with or without ACL reconstruction (ACLR), and more high-quality studies evaluating outcomes after the different treatment courses are needed. The purpose of the present study was to describe and compare 5-year clinical, functional, and physical activity outcomes for patients who...
Chapter
The Olympic Winter sliding sports include luge, bobsleigh, and skeleton. Collectively, these sports demonstrate a relatively high rate of injury among athletes competing in the Winter Olympic Games. Athletes are at risk of sustaining injury due to the icy track and high speeds achieved by the athletes during training and competition runs. Further,...
Article
Objective: To identify trajectories of patient-reported knee function over five years in patients with degenerative meniscal tears, and to explore whether baseline characteristics were associated with trajectories of sport and recreational function. Design: Prospective cohort study. Methods: We conducted a secondary exploratory analysis of the...
Article
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Translating patient‐reported outcome measures (PROMs) can alter the meaning of items and undermine the PROM's psychometric properties (quantified as cross‐cultural differential item functioning [DIF]). The aim of this paper was to present the theoretical background for PROM translation, adaptation, and cross‐cultural validation, and assess how PROM...
Article
Full-text available
Treatment strategies for anterior cruciate ligament (ACL) injuries continue to evolve. Evidence supporting best practice guidelines for the management of ACL injury is to a large extent based on studies with low-level evidence. An international consensus group of experts was convened to collaboratively advance towards consensus opinions regarding t...
Article
Background: Increased lateral posterior tibial slope (LPTS) is associated with increased rates of anterior cruciate ligament (ACL) injury and failure of ACL reconstruction. It is unknown if ACL deficiency influences the developing proximal tibial physis and slope in skeletally immature patients through anterior tibial subluxation and abnormal force...
Article
Objective: To describe the injury and illness characteristics among participating athletes during the Lausanne 2020 Youth Olympic Winter Games (YOG 2020), 9-22 January 2020. Methods: The daily number of athlete injuries and illnesses were recorded (1) through the reporting of all National Olympic Committee (NOC) medical teams and (2) in the poly...
Article
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Purpose: Describe the frequency and severity of knee ligament sprains diagnosed by MRI in athletes participating at the 2016 Summer Olympic Games, their association with certain sports and assess correlations with additional knee structural injury. Patients and methods: All knee MRIs performed in the Olympic Village and polyclinics during the 20...
Article
Stress radiographs can provide an objective, quantifiable assessment of ligamentous knee injury. Commonly utilized techniques include varus, valgus, and posterior stress radiographs and can be used to augment findings on physical examination and magnetic resonance imaging. Both in vitro and in vivo studies have demonstrated reliability and validity...
Article
Objectives: To describe and compare the epidemiology of competition injuries in unarmed combat sports (ie, boxing, judo, taekwondo and wrestling) in three consecutive Olympic Games. Methods: Prospective cohort study using injury data from the IOC injury surveillance system and exposure data from official tournament records at three consecutive Oly...
Article
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All sport events have inherent injury and illness risks for participants. Healthcare services for sport events should be planned and delivered to mitigate these risks which is the ethical responsibility of all sport event organisers. The objective of this paper was to develop consensus-driven guidelines describing the basic standards of services ne...
Article
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Objective Describe the self-reported prevalence and nature of Olympic-career injury and general health and current residual symptoms in a self-selected sample of retired Olympians. Methods 3357 retired Olympians from 131 countries completed a cross-sectional online survey, distributed by direct email through World Olympians Association and Nationa...
Article
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Purpose: To establish recommendations for diagnosis, classification, treatment, and rehabilitation of posteromedial corner (PMC) knee injuries using a modified Delphi technique. Methods: A list of statements concerning the diagnosis, classification, treatment and rehabilitation of PMC injuries was created by a working group of four individuals. Us...
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The author decided to opt for Open Choice and to make the article an Open Access publication.
Article
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Objectives To develop an assessment and recognition tool to identify elite athletes at risk for mental health symptoms and disorders. Methods We conducted narrative and systematic reviews about mental health symptoms and disorders in active and former elite athletes. The views of active and former elite athletes (N=360) on mental health symptoms in...
Article
Full-text available
Purpose: To report the MRI patterns of knee cartilage damage and concomitant internal derangement in athletes participating at the Rio de Janeiro 2016 Olympic Games. Methods: Knee MRIs obtained at the core imaging facility of the International Olympic Committee were blindly, retrospectively reviewed by a board-certified musculoskeletal radiologi...
Article
Purpose: Recent registry data have demonstrated a higher revision rate of quadriceps tendon (QT) graft compared with hamstring tendon (HT) and patellar tendon (PT) grafts. Clinic routines could be an important factor for revision outcomes. The purpose of this study is to use the Danish Knee Ligament Reconstruction Registry (DKRR) to compare revisi...
Article
Background Blood derivative injections have been recently proposed to address osteoarthritis (OA) with overall positive results, although long-term data on their efficacy are lacking. A novel blood derivative has been developed to concentrate growth factors and antagonists of inflammatory cytokines and shown promising early findings. Purpose To in...
Article
Full-text available
The posteromedial and posterolateral corner structures contribute significantly to knee stability. The posterior oblique ligament is a primary restraint to internal rotation and a secondary restraint to valgus. The superficial fibres of the medial collateral ligament are the primary valgus restraint and also provide secondary internal and external...
Article
Full-text available
Treatment strategies for ACL injuries continue to evolve. Evidence supporting best practice guidelines to manage ACL injury is largely based on studies with low-level evidence. An international consensus group of experts was convened determine consensus regarding best available evidence on operative versus non-operative treatment for ACL injury. Th...
Article
Full-text available
Treatment strategies for anterior cruciate ligament (ACL) injuries continue to evolve. Evidence supporting best-practice guidelines for the management of ACL injury is to a large extent based on studies with low-level evidence. An international consensus group of experts was convened to collaboratively advance toward consensus opinions regarding th...
Article
Full-text available
Background A precise and consistent definition of return to sport (RTS) after anterior cruciate ligament (ACL) injury is lacking, and there is controversy surrounding the process of returning patients to sport and their previous activity level. Purpose The aim of the Panther Symposium ACL Injury Return to Sport Consensus Group was to provide a cle...
Preprint
Full-text available
Objectives To develop an assessment tool for the early identification of elite athletes potentially at risk for experiencing mental health symptoms and disorders Stepwise approach Firstly, narrative and systematic reviews of the scientific literature about mental health symptoms and disorders in active and former elite athletes were conducted. Seco...
Article
Full-text available
Treatment strategies for anterior cruciate ligament (ACL) injuries continue to evolve. Evidence supporting best practice guidelines for the management of ACL injury is to a large extent based on studies with low-level evidence. An international consensus group of experts was convened to collaboratively advance toward consensus opinions regarding th...
Article
Full-text available
Background: Focal cartilage defects (FCDs) in the knee joint has a high prevalence. A broad range of treatment options exists for symptomatic patients. Knowledge of patient compensation claims following surgical treatment of FCDs is missing. The purpose of this study is to evaluate compensation claims filed to the Scandinavian registries for patie...
Article
Two decades ago, it was not uncommon to call the posterolateral corner of the knee the “dark side of the knee.” This was because there were few quantitative anatomic data, no anatomic-based reconstructions, and a high rate of clinical outcome failures. Most nonanatomic posterolateral reconstruction procedures at the time commonly resulted in signif...
Chapter
Anterior cruciate ligament (ACL) injuries are one of the most common injuries of the knee, with an estimated incidence of 200,000 per year in the United States [1, 2]. Treatment of ACL injuries remains one of the most prevalent musculoskeletal procedures performed, affecting 1 in 3000 among the general population of the United States. In Norway, th...
Article
Full-text available
PurposeTo study the incidence of acromioclavicular joint injuries in a general population.Methods All acute shoulder injuries admitted to an orthopaedic emergency department were registered prospectively, using electronic patient records and a patient-reported questionnaire. The regional area was the city of Oslo with 632,990 inhabitants. Patients...