BACKGROUND Deltoid ligament injuries occur in isolation as well as with ankle fractures and other ligament injuries. Both operative treatment and nonoperative treatment are used, but debate on optimal treatment continues. Likewise, the best method of surgical repair of the deltoid ligament remains unclear. PURPOSE To determine the biomechanical role of native anterior and posterior components of the

BACKGROUND Postoperative infections, commonly from Staphylococcus epidermidis, may result in anterior cruciate ligament graft failure and necessitate revision surgery. In biomechanical studies, S. epidermidis has been shown to establish biofilms on tendons and reduce graft strength. PURPOSE/HYPOTHESIS The goal of this study was to determine the effect of bacterial bioburden on the collagen structure

BACKGROUND Whether vitamin D deficiency is related to rotator cuff muscle and tendon physiology is controversial. PURPOSE To assess the relationship between vitamin D deficiency and various gene expression patterns in patients with rotator cuff tears. STUDY DESIGN Controlled laboratory study. METHODS During arthroscopic surgery, samples from the supraspinatus muscle, deltoid muscle, and supraspinatus

BACKGROUND Minced cartilage implantation (MCI) has seen a renaissance in recent years. In this evolved technique, human articular cartilage is harvested with an arthroscopic shaver, augmented with platelet-rich plasma (PRP), and implanted with autologous thrombin. This modified technique combines the possibility of cell-based surgical cartilage repair with a minimally invasive autologous 1-step procedure

BACKGROUND The posterior tibial slope has been identified as an anatomic risk factor for anterior cruciate ligament insufficiency and reruptures after anterior cruciate ligament reconstruction. Anterior tibial closing wedge osteotomy for correction of sagittal plane deformities has the potential to cause an unintended change in coronal plane alignment. PURPOSE To evaluate the effects of anterior tibial

BACKGROUND Animal models play an important role in studying posttraumatic osteoarthritis (PTOA) disease progression. Different models exist, such as destabilization of the medial meniscus (DMM), anterior cruciate ligament (ACL) surgical transection (ACLs), and noninvasive ACL rupture. PURPOSE To study the effects of PTOA on nociception in 3 different murine models and to relate these findings to macroscopic

BACKGROUND The natural history of Kaplan fiber (KF) injuries after acute primary anterior cruciate ligament (ACL) reconstruction (ACLR) remains unknown. PURPOSE/HYPOTHESIS The purpose of this study was to evaluate the temporal change in the magnetic resonance imaging (MRI) appearance of the KF complex after acute primary ACLR. It was hypothesized that KF injuries would resolve with time. STUDY DESIGN

BACKGROUND Borderline acetabular dysplasia is commonly radiographically defined as a lateral center-edge angle (LCEA) of 20° to 25°. While the variability of plain radiographic assessment of this population has been reported, an understanding of the variability of 3-dimensional (3D) hip morphology remains to be better defined. PURPOSE To investigate the variability of 3D hip morphology present on low-dose

BACKGROUND Medial meniscus posterior root tears (MMPRTs) cause pain and dysfunction and are associated with poor clinical outcomes with nonoperative management at short-term follow-up. However, little is known about the long-term natural history of these tears. PURPOSE The purpose of this study was to (1) provide an update to a previous minimum 2-year study on the natural progression of these tears

BACKGROUND Participation in martial arts has been increasing for several years, with millions of children and adolescents engaging in the sport annually. Yet, the most comprehensive examination of martial arts-related injuries was completed almost 2 decades ago. PURPOSE To describe the epidemiology of martial arts-related injuries presenting to US emergency departments (EDs) among pediatric patients

BACKGROUND Ankle osteoarthritis is debilitating and usually affects relatively young people, often as a result of previous ankle traumas, frequently occurring in sports. Platelet-rich plasma (PRP) injections for ankle osteoarthritis have shown no evidence of benefit over the course of 26 weeks. Previous studies on PRP for knee osteoarthritis showed that clinically significant improvements with PRP

BACKGROUND High tibial osteotomy (HTO) and distal femoral osteotomy (DFO) are well-recognized treatments to address varus and valgus malalignment, respectively, in the setting of symptomatic unicompartmental arthritis of the tibiofemoral joint. The existing literature is limited in its ability to characterize complications after HTO or DFO procedures. PURPOSE The objective of this study was to determine

BACKGROUND Superior capsular reconstruction (SCR) is a procedure purported to restore stability of the glenohumeral joint after an irreparable rotator cuff tear, but the in vivo behavior of the graft is unknown. Previous work has not evaluated the relationship between graft deformation, kinematics, and healing. PURPOSE To (1) determine regional graft elongation after SCR, (2) determine if graft elongation

BACKGROUND Members of the military are known to experience disproportionately high rates of both glenohumeral instability and superior labrum anterior-posterior (SLAP) tears when compared with civilian populations. Although the outcomes after simultaneous repair of Bankart and SLAP lesions have been well described, there is a paucity of literature available regarding the operative management of posterior

BACKGROUND Coronal and sagittal malalignment of the knee are well-recognized risk factors for failure after anterior cruciate ligament (ACL) reconstruction (ACLR). However, the effect of axial malalignment on graft survival after ACLR is yet to be determined. PURPOSE To evaluate whether increased tibiofemoral rotational malalignment, namely, tibiofemoral rotation angle (TFA) and tibial tubercle-trochlear

BACKGROUND Femoral torsion measurements and outcomes are variable throughout the literature and have focused on short-term follow-up. However, there is a paucity of literature investigating clinically meaningful outcomes at midterm follow-up after hip arthroscopy for femoroacetabular impingement syndrome (FAIS). PURPOSE To quantify femoral version using computed tomography imaging in patients with

BACKGROUND Tibial spine fractures are common in the pediatric population because of the biomechanical properties of children's subchondral epiphyseal bone. Most studies in porcine or adult human bone suggest that suture fixation performs better than screw fixation, but these tissues may be poor surrogates for pediatric bone. No previous study has evaluated fixation methods in human pediatric knees

BACKGROUND The extent to which recurrent patellar instability (RPI) affects wrestlers has not been thoroughly examined. PURPOSE To assess return to wrestling (RTW), patient-reported outcomes, and reoperation rates after patellofemoral stabilization surgery (PFSS) for RPI in a cohort of competitive wrestlers. STUDY DESIGN Cohort study; Level of evidence, 3. METHODS All competitive wrestlers with a history

BACKGROUND In recent years, the placement of a subacromial balloon (SAB) spacer has emerged as a treatment option for massive irreparable rotator cuff tears (MIRCTs); however, there is significant controversy regarding its utility in comparison with other surgical interventions. PURPOSE To compare outcomes after SAB spacer placement versus arthroscopic debridement for MIRCTs. STUDY DESIGN Dual-armed

BACKGROUND Hip arthroscopy is an effective treatment tool for athletes with femoroacetabular impingement (FAI) syndrome. However, long-term data are scarce. PURPOSE To assess survivorship, minimum 10-year patient-reported outcome measures (PROMs), and sports participation after primary hip arthroscopy for FAI syndrome in athletes and to perform a propensity-matched comparison between patients undergoing

BACKGROUND Young patients are 6 times more likely than adults to have a primary anterior cruciate ligament (ACL) graft failure. Biological factors (ie, tunnel osteolysis) may account for up to a third of these failures. Previous evaluations of patient ACL explants indicated significant bone loss within the entheseal regions. However, it remains unknown if the degree of bone loss within the ACL insertion

BACKGROUND Osteoarthritis is a chronic, progressive, and degenerative condition with limited therapy options. Recently, biologic therapies have been an evolving option for the management of osteoarthritis. PURPOSE To assess whether allogenic mesenchymal stromal cells (MSCs) have the potential to improve functional parameters and induce cartilage regeneration in patients with osteoarthritis. STUDY DESIGN

BACKGROUND Meniscus root tears are associated with chondral injury, early degenerative change, and a high conversion rate to total knee arthroplasty. It is well-established that meniscus root tears lead to decreased femorotibial contact area, increased peak contact pressures, and increased stress on the articular cartilage. PURPOSE To evaluate the biomechanical characteristics of the all-inside meniscus

BACKGROUND Existing biomechanical studies of posterior glenoid bone loss and labral pathology are limited by their use of anterior instability models, which differ in both orientation and morphology and have been performed in only a single, neutral arm position. PURPOSE To evaluate the biomechanical effectiveness of a posterior labral repair in the setting of a clinically relevant posterior bone loss

BACKGROUND Lateral extra-articular procedures have been effective in reducing graft rupture rates after anterior cruciate ligament (ACL) reconstruction (ACLR), but the evidence supporting their role in ACL repair is sparse. PURPOSE/HYPOTHESIS The purpose was to compare clinical and radiological outcomes of ACLR and lateral extra-articular tenodesis (LET) (ACLR+LET) against combined repair of the ACL

BACKGROUND Functional restoration of the bone-to-tendon interface (BTI) after rotator cuff repair is a challenge. Therefore, numerous biocompatible biomaterials for promoting BTI healing have been investigated. PURPOSE To determine the efficacy of scaffolds with spatiotemporal delivery of growth factors (GFs) to accelerate BTI healing after rotator cuff repair. STUDY DESIGN Controlled laboratory study

BACKGROUND Physical fatigue and cognitive performance have been suggested as risk factors for an anterior cruciate ligament (ACL) injury, and fatigue has also been demonstrated to reduce cognitive processing. The combined effects of fatigue and lower cognitive function during cognitive-challenging movements may increase knee mechanics associated with the ACL injury risk. HYPOTHESES We hypothesized

BACKGROUND Previous studies have demonstrated several prognostic factors for retear after arthroscopic rotator cuff repair (ARCR). However, studies that histologically evaluate the quality of the torn rotator cuff (RC) tendon and its association with postoperative outcomes are limited. PURPOSE To investigate factors associated with retear after ARCR using the suture bridge (SB) technique, including

BACKGROUND All-suture anchors and knotless anchors are increasingly used in the repair of anteroinferior labral tears in patients with shoulder instability. Optimal repair constructs may limit recurrent instability. PURPOSE To perform a quantitative biomechanical comparison of 3 labral fixation devices for soft tissue Bankart lesions: knotless soft-body tensionable anchor (SB knotless), knotted soft-body

BACKGROUND Intra-articular injection of autologous culture-expanded adipose-derived mesenchymal stem cells (ADMSCs) has introduced a promising treatment option for knee osteoarthritis. Although the clinical efficacy and safety of ADMSCs have been reported, the treatment remains controversial owing to the small sample sizes and heterogeneous osteoarthritis grades in previous studies. PURPOSE To assess

BACKGROUND Acromioclavicular (AC) joint dislocation is a common clinical problem among young and athletic populations. Surgical management is widely used for high-grade dislocations (Rockwood III-VI) and in high-demand athletes at high risk of recurrence. PURPOSE To systematically review the evidence in the literature to ascertain the rate and timing of return to play (RTP) and the availability of

BACKGROUND Tibial spine fractures (TSFs) are uncommon injuries that may result in substantial morbidity in children. A variety of open and arthroscopic techniques are used to treat these fractures, but no single standardized operative method has been identified. PURPOSE To systematically review the literature on pediatric TSFs to determine the current treatment approaches, outcomes, and complications

BACKGROUND Lower trapezius transfer (LTT) has been proposed for restoring the anteroposterior muscular force couple in the setting of an irreparable posterosuperior rotator cuff tear (PSRCT). Adequate graft tensioning during surgery may be a factor critical for sufficient restoration of shoulder kinematics and functional improvement. PURPOSE/HYPOTHESIS The purpose was to evaluate the effect of tensioning

BACKGROUND An Achilles tendon rupture (ATR) is a frequent injury and results in the activation of tendon cells and collagen expression, but it is unknown to what extent turnover of the tendon matrix is altered before or after a rupture. PURPOSE/HYPOTHESIS The purpose of this study was to characterize tendon tissue turnover before and immediately after an acute rupture in patients. It was hypothesized

BACKGROUND Several tibiofemoral anatomic features have been repeatedly associated with increased anterior cruciate ligament (ACL) injury risk. Previous studies have highlighted age and sex differences among these anatomic risk factors, but little is known about the normal and pathologic development of these differences during skeletal maturation. PURPOSE To investigate differences in anatomic risk

BACKGROUND Despite similar published rates of rerupture among patients treated with early functional rehabilitation and open repair for acute Achilles tendon rupture, uncertainty still exists regarding the optimal treatment modality. The reverse fragility index (RFI) is a statistical tool that provides an objective measure of the study's neutrality by determining the number of events that need to change

BACKGROUND Increased femoral torsion (FT) or tibial torsion (TT) has been suggested to be a potential risk factor for recurrent patellofemoral instability. However, the influence of increased FT or TT on the postoperative clinical outcomes of recurrent patellofemoral instability has rarely been investigated. PURPOSE To assess the effect of increased FT or TT on postoperative results in patients with

BACKGROUND The semimembranosus (SM) tendon acts as a secondary dynamic stabilizer of the knee. It restrains external rotation and anterior translation of the medial compartment. Its role in the mechanism of injury during anterior cruciate ligament (ACL) rupture is unknown. HYPOTHESIS The bone bruise (BB) often detected at the posteromedial tibia in association with acute ACL tear may be related to

BACKGROUND An increased tibial slope (TS) has been identified as a risk factor for anterior cruciate ligament (ACL) injury and graft failure after ACL reconstruction. However, different imaging modalities are used to determine the TS, resulting in divergent values. Consequently, no reference values and no consensus on thresholds can be reached, which in turn is mandatory for indicating correction osteotomies

BACKGROUND The prevalence of partial-thickness rotator cuff tears (PTRCTs) has been reported to be 13% to 40% within the adult population, accounting for 70% of all rotator cuff tears. Approximately 29% of PTRCTs will progress to full-thickness tears if left untreated. The long-term clinical course after arthroscopic repair of PTRCTs is not well known. PURPOSE To investigate minimum 10-year patient-reported

BACKGROUND Microfracture (MF) is frequently performed as a first-line treatment for articular cartilage defects. Although good clinical outcomes are often obtained in the short term, poor clinical outcomes sometimes occur because of subchondral bone deterioration. The condition of the subchondral bone treated with MF may affect the repair of the osteochondral unit. PURPOSE To analyze histological findings

BACKGROUND Publicly obtained data (POD) have recently been utilized frequently by sports medicine researchers to describe injury patterns, risk factors, and outcomes in elite athletes. The relative ease of this type of research that is based solely on internet and media sources has resulted in a near exponential increase in the number of these POD studies. PURPOSE To systematically review the sports

BACKGROUND Clinical tools based on machine learning analysis now exist for outcome prediction after primary anterior cruciate ligament reconstruction (ACLR). Relying partly on data volume, the general principle is that more data may lead to improved model accuracy. PURPOSE/HYPOTHESIS The purpose was to apply machine learning to a combined data set from the Norwegian and Danish knee ligament registers

BACKGROUND Exercises that provide progressive therapeutic loading are a central component of patellofemoral pain rehabilitation, but quantitative evidence on patellofemoral joint loading is scarce for a majority of common weightbearing rehabilitation exercises. PURPOSE To define a loading index to quantify, compare, rank, and categorize overall loading levels in the patellofemoral joint across 35 types

BACKGROUND Treatment of meniscal injuries at the time of anterior cruciate ligament reconstruction (ACLR) can result in restrictions on weightbearing and range of motion in the early rehabilitative phases. What is unknown is the effect of (1) meniscal tear type and location at the time of anterior cruciate ligament injury and (2) meniscal treatment at the time of ACLR on quadriceps strength in adolescents

BACKGROUND Tarsal navicular bone stress injuries (BSIs) are considered "high risk" because of prolonged healing times and higher rates of nonunion in adult populations but, to our knowledge, have not been comprehensively examined in adolescent athletes. PURPOSE To describe the characteristics of tarsal navicular BSIs in adolescents. STUDY DESIGN Case series; Level of evidence, 4. METHODS A retrospective

BACKGROUND Arthroscopic superior capsular reconstruction (aSCR) has emerged as a treatment option for managing massive rotator cuff tears (MRCTs) given the unpredictable results after an arthroscopic rotator cuff repair (aRCR). Yet, few comparative studies of aSCR and aRCR have been conducted. PURPOSE To compare the clinical and radiological outcomes between aRCR and aSCR in patients with MRCT. STUDY

BACKGROUND Atrophy of the rotator cuff is a negative prognostic indicator after rotator cuff repair. Although full-thickness rotator cuff tears accompanied by tendon retraction are commonly associated with decreased muscle cross-sectional area (CSA) on magnetic resonance imaging (MRI), it is unclear whether this is accompanied by histologic atrophy of rotator cuff myofibers. PURPOSE To evaluate the

BACKGROUND The effect of a concurrent cartilage procedure in lateral meniscal allograft transplantation (MAT) in patients with bipolar cartilage lesions (high-grade lesions on both the femoral and the tibial side) is not well studied. An objective evaluation of graft status after MAT and a concurrent cartilage procedure has not been reported. PURPOSE To investigate the effect of concurrent cartilage

BACKGROUND There is no practical consensus on managing cholesterol in patients with rotator cuff repair despite hyperlipidemia and statin therapy being well-known factors in rotator cuff healing. The 10-year atherosclerotic cardiovascular disease (ASCVD) risk score is a commonly used guideline to determine statin administration for hyperlipidemia. PURPOSE To identify the relationship between retear

BACKGROUND Lower extremity (LEX) strains, including hamstring, quadriceps, adductor, and calf strains, are among the most common injuries in sports. These injuries lead to high burden, resulting in significant missed participation time. PURPOSE To describe the incidence of LEX strains in professional American football. STUDY DESIGN Descriptive epidemiology study. METHODS This study included all players

BACKGROUND Previous studies have examined the effect of whole body (WB) parameters on anterior cruciate ligament (ACL) strain and loads, as well as knee joint kinetics and kinematics. However, articular cartilage damage occurs in relation to ACL failure, and the effect of WB parameters on ACL strain and articular cartilage biomechanics during dynamic tasks is unclear. PURPOSES (1) To investigate the

BACKGROUND Limited literature exists regarding how postoperative physical therapy (PT) may affect outcomes in patients with femoroacetabular impingement syndrome (FAIS) undergoing hip arthroscopy. Additionally, it is unknown how PT measures relate to traditional orthopaedic patient-reported outcomes (PROs). PURPOSE To evaluate how the duration of PT may correlate with outcomes in patients with FAIS

BACKGROUND Chronic lateral ankle instability that develops after ankle sprains has a severe, negative influence on the patient's lower extremity function. Anatomic repair or reconstruction of the lateral ankle ligament is an effective treatment for people with chronic lateral ankle instability who want to regain their preinjury levels of work and sport. PURPOSE To determine the rate of return to sport