Background: Synovial fluid (SF) biomarkers demonstrate time-dependent variation after acute knee injury, and it is postulated that persistently elevated inflammatory markers may mediate worse long-term outcomes. Purpose: This study investigated the relationship between biomarkers in SF at the time of meniscectomy and long-term patient-reported outcomes in patients with acute versus chronic meniscal

Background: Whether the use of platelet-rich plasma (PRP) as an adjuvant to extensor carpi radialis brevis (ECRB) repair in recalcitrant lateral epicondylitis (RLE) promotes tendon healing and improves clinical outcomes remains unclear. Purpose: To evaluate the tendon healing and clinical outcomes of arthroscopic ECRB repair combined with PRP injection and compared with arthroscopic ECRB repair alone

Background: The outcomes of surgical repair for traumatic avulsions of the pyramidalis, anterior pubic ligament, adductor longus complex (PLAC) remain unknown. Purpose: To report how surgical repair for PLAC injuries in professional athletes affected return to preinjury level of sporting activity, injury recurrence, patient satisfaction, functional performance, and complications. Study Design: Case

Background: Mesenchymal stromal cell (MSC) techniques represent a promising method to enhance the surgical repair of rotator cuff tears. To eliminate the resource-intensive process of cell isolation and culture expansion, a method to recruit endogenous MSCs was investigated in an established rat model of rotator cuff repair. Hypothesis: MSCs can be pharmacologically mobilized from the peripheral blood

Background: While both short- and long-term outcomes after hip arthroscopy for femoroacetabular impingement syndrome (FAIS) have been reported, the predictive relationship between the two has yet to be established. Purpose: To determine whether the degree of improvement in patient-reported outcomes observed at 1 year postoperatively predicts long-term outcomes at 10 years after primary hip arthroscopy

Background: Medial closing wedge distal femoral osteotomy (CWDFO) is used to correct valgus deformities and manage lateral osteoarthritis (OA) and patellar dislocation (PD). However, its effect on the tibial tuberosity–trochlear groove (TT-TG) distance remains debated, with limited studies evaluating contributing factors. Purpose: To determine whether TT-TG distance changes after CWDFO differ by the

Background: Recent literature has shown that inferior Hill-Sachs extension for on-track shoulders is predictive of recurrent instability after arthroscopic Bankart repair alone. Specifically, there is a high risk for recurrent instability when the lesion extends below the humeral equator on sagittal magnetic resonance imaging. This worrisome inferior extension has been termed “critical humeral bone

Background: Anabolic-androgenic steroids (AASs) are synthetic derivatives of testosterone that are abused by athletes to enhance their physical appearance and performance. AAS abusers have an increased risk of tendon ruptures compared with nonusers, and it has been proposed that AASs damage tendon tissue. Only a few human studies have investigated the effect of AASs on tendon tissue, and to our knowledge

Background: Primary anterior cruciate ligament (ACL) repair (ACLPR) demonstrates promising short-term clinical outcomes in select patients; however, it remains poorly understood as to whether previously reported short-term outcomes are maintained at midterm follow-up. Purpose: To determine whether short-term (2-year) outcomes are maintained at 5 years after ACLPR, evaluate age-stratified failure and

Background: Meniscal injuries trigger a local inflammatory response mediated by intra-articular mediators. Proinflammatory cytokines and chemokines can lead to cartilage degradation and subchondral bone changes, contributing to posttraumatic osteoarthritis. The role that age plays in this inflammatory response is unclear. Purpose: To investigate age-dependent variation in cytokine types and concentrations

Background: Central acetabular stenosis (CAS), defined as an osteophyte within the acetabular fossa, is associated with higher rates of femoral head chondral damage and, when left untreated, inferior short-term outcomes after hip arthroscopic surgery. Central acetabular decompression (CAD) is an arthroscopic technique to resect the osteophyte and resurface the acetabular fossa to improve contact mechanics

Background: Anterior cruciate ligament (ACL) reconstruction (ACLR) in the presence of excessive posterior tibial slope (PTS) is a well-established risk factor for increased ACL graft forces and a heightened risk of graft failure. Purpose/Hypothesis: The primary aim of this study was to evaluate whether lateral extra-articular tenodesis (LET) could mitigate the adverse effects of increased PTS on knee

Background: Major League Baseball (MLB) recently instituted a combine for their prospective players. Purpose/Hypothesis: The purpose of this study was to report initial epidemiological findings for both physical examination and imaging findings for the MLB Combine. It was hypothesized that most players would have no significant abnormal physical examination findings, but most would have abnormal findings

Background: Emerging evidence suggests that anterior cruciate ligament (ACL) ruptures can restore ACL fiber continuity. The relationship between ACL continuity on magnetic resonance imaging (MRI) (sign of ACL healing) and outcomes >5 years after an acute ACL rupture has not been investigated. Purpose: This study aimed to (1) describe clinical outcomes and radiographic osteoarthritis (ROA) at 11 years

Background: The optimal graft choice for posterior cruciate ligament reconstruction (PCLR) remains controversial. Purpose: To evaluate and compare the biomechanical and clinical outcomes, as well as the complication and failure rates, associated with the use of Achilles allografts; hamstring tendon (HST), quadriceps tendon (QT), and bone–patellar tendon–bone (BTB) autografts; and hybrid (HY) grafts

Background: An Achilles tendon rupture is a common orthopaedic injury in athletes and other people. Therefore, it is essential to investigate methods that may yield beneficial results for tendon healing by addressing the inflammatory and gene expression aspects of the healing process. Purpose: The objective of this study was to examine the effect of combining aerobic exercise and omega-3 supplementation

Background: Arthroscopic superior capsule reconstruction (ASCR) with combined fascia lata autograft and synthetic scaffold patch graft has been reported to improve graft healing and treat irreparable rotator cuff tears (RCTs). Information about the surgical outcomes of using different synthetic scaffold materials is limited. Purpose: To compare the clinical outcomes of the ASCR technique using LARS

Background: Anteromedial rotatory instability (AMRI) can result from combined injury to the anterior cruciate ligament (ACL) and medial collateral ligament (MCL) complex (superficial and deep [sMCL and dMCL]). Hypothesis: Adding an oblique anteromedial (AM) limb to an sMCL reconstruction improves the control of AMRI. Study Design: Controlled laboratory study. Methods: A 6 degrees of freedom robotic

Background: Osteochondral allograft transplant and autograft transplant for femoral head defects have emerged as promising treatments for concomitant cartilage and subchondral bone injuries in young patients. Purpose: To evaluate the clinical and radiological outcomes of patients who underwent osteochondral allograft or autograft transplant for femoral head defects and identify any risk factors that

Background: Operative repair of partial proximal hamstring avulsions has been shown to improve pain and function at short- and midterm follow-up. Long-term outcomes have not yet been reported. Furthermore, it is unknown whether greater tendon involvement (ie, tendon number) in partial tears affects clinical outcomes. Hypothesis: Hamstring function and patient satisfaction would remain stable over time

Background: Primary osteochondral allograft transplantation (OCA) of the knee has been shown to improve patient-reported outcome measure (PROM) scores at various follow-up time points. However, studies analyzing the effects of patient sex on primary OCA outcomes remain limited and show conflicting results. Purpose: To compare PROM scores and clinically significant outcome (CSO) achievement rates at

Background: Patellar tendinopathy (PT) is a highly prevalent injury among jumping athletes. The long-term prognosis of athletes with PT following physical therapy is unknown. Purpose: To assess self-perceived recovery rate and the 5-year change in pain levels, disability, and sports participation, and to explore the prognostic factors associated with self-perceived recovery. Study Design: Cohort study;

Background: Elbow flexion at stagnant time points of the pitch has been associated with increased elbow varus torque (EVT) and elbow injury history. Purpose: To determine how elbow flexion angle throughout the pitch (excursion) between individual pitchers and a cohort of pitchers influences throwing arm kinetics in high school (HS) and professional (PRO) pitchers. Study Design: Descriptive laboratory

Background: Previous studies have identified predictors of total hip arthroplasty (THA) conversion after hip arthroscopy (HA) for femoroacetabular impingement syndrome (FAIS) at short- to midterm follow-up, yet no studies to the authors’ knowledge have established a scoring system for predicting THA conversion at a minimum 10-year follow-up. Purpose: To create a scoring system to predict 10-year THA

Background: Previous literature shows that current osteochondral allograft (OCA) harvesting techniques lead to donor plug chondrocyte death during OCA transplant for treating focal knee cartilage defects. Purpose: To evaluate the effects of drilling/reaming speed and irrigation temperature on chondrocyte viability during OCA harvest. Study Design: Controlled laboratory study. Methods: From each human

Background: The concept of early intervention at the appropriate time has been recognized for treating posttraumatic osteoarthritis (PTOA). However, the optimal intervention timing to achieve superior therapeutic efficacy remains unclear. In addition, there is a lack of direct evidence regarding therapeutic efficacies achieved at different time points. Hypothesis: The administration schedule of stem/stromal

Background: Efforts to decrease pain, improve early rehabilitation, and reduce opioid consumption have prompted a focus on peripheral nerve blocks for pain management after anterior cruciate ligament reconstruction (ACLR). The commonly used adductor canal block (ACB) might not provide sufficient postoperative pain control because of its lack of coverage of the posterior aspect of the knee. The addition

Background: Patients undergoing hip arthroscopic surgery for femoroacetabular impingement syndrome (FAIS) have been shown to achieve clinically significant outcomes (CSOs) at high rates. However, limited studies, to date, have identified independent predictors of achieving CSOs at a minimum 10-year follow-up, and even fewer studies have reported on patients treated with contemporary hip arthroscopic

Background: The J-sign is a marker of abnormal patellar tracking and is associated with bony abnormalities. When patella alta is present, distal tibial tubercle osteotomy (dTTO) can enable the patella to engage in a more distal/deeper groove, often eliminating the J-sign. Purpose: To determine which anatomic findings are associated with a persistent J-sign after medial patellofemoral ligament reconstruction

Background: Irreparable acetabular labral defects often require acetabular labral reconstruction (ALR) to restore hip joint health and function. Optimal graft choices for ALR have not been fully delineated. Hypothesis: Fresh meniscal allograft transplantation (MAT) will be associated with cellular, extracellular matrix, geometric, and integration characteristics that mimic native acetabular labrum

Background: Lateral hinge fractures (LHFs) are considered risk factors for delayed union or nonunion after medial open-wedge high tibial osteotomies (MOWHTOs). However, there is limited evidence on the extent to which the morphology of the hinge fracture influences the stability of a MOWHTO. Purpose/Hypothesis: The purpose of this study was to validate the Takeuchi classification under axial and torsional

Background: Sagittal-plane slope-reducing high tibial osteotomy (HTO) can reduce the risk of anterior cruciate ligament (ACL) injury in knees with a high posterior tibial slope. The biomechanical effect of slope-reducing HTO on tibiofemoral kinematics and force carried by the ACL remains less well understood. Hypothesis: Decreased tibial slope will be associated with decreased ACL force, coupled internal

Background: Gluteus medius and/or minimus (GM) repair has been shown to provide improved patient-reported outcomes (PROs), yet few studies have established how postoperative physical therapy (PT) after GM repair affects patient recovery. Purpose: To (1) evaluate the trajectory of patient improvement after GM repair during PT and (2) identify how the duration of PT influences minimum 2-year PROs. Study

Background: Latarjet is the gold standard procedure for treating anterior shoulder instability associated with significant bone loss. However, concerns arise regarding associated anatomic and mechanical changes, including release of the pectoralis minor tendon and alteration of the conjoint tendon vector. Recent studies have investigated alterations in scapular position and motion after Latarjet, with

Background: Trochleoplasty aims to correct trochlear dysplasia, an osseous cause of patellar instability. The procedure involves the use of a high-speed bur directly under femoral articular cartilage, which may place chondrocytes at risk of thermal necrosis. Purpose/Hypothesis: The purpose of this study was to investigate the effect of irrigation and offset used during a trochleoplasty procedure on

Background: Chondrocyte-based cell therapy remains a promising method for cartilage repair, despite limitations faced during the last 30 years. Purpose/Hypothesis: This work presents hyaline-like bioengineered beads from donor chondrocytes as a novel treatment option for cartilage lesions. It was hypothesized that the implanted cartilage minigrafts would be able to treat cartilage lesions by complete

Background: Both tibial spine fractures (TSFs) and anterior cruciate ligament (ACL) tears result in functional loss of knee stability. Nonetheless, it remains unclear why some patients sustain ACL tears, whereas others have TSFs. Purpose: To identify the common morphological risk factors for pediatric ACL tears and TSFs and to determine the morphological differences between them using multiplanar reconstruction

Background: Periacetabular osteotomy (PAO) can treat pain, dysfunction, and decreased activity secondary to hip dysplasia. Patients’ pre- and postoperative activity can be measured using the University of California Los Angeles (UCLA) activity score, a validated questionnaire. Understanding return to and maintenance of activity at long-term follow-up after PAO is a priority for active patients. Purpose:

Background: The Ankle-GO is a composite outcome score based on 4 functional tests and 2 patient-reported outcome measures. It was initially described and validated for its ability to predict return to sports (RTS) at the same level of play after lateral ankle sprains. Purpose/Hypothesis: The main aim of this study was to assess the psychometric properties of the Ankle-GO in patients after Achilles

Background: Concomitant injuries after an anterior cruciate ligament (ACL) tear differ between sports, which may be related to divergent loading patterns. Bone bruises (BBs) can provide insight into the biomechanical injury mechanism. Purpose/Hypothesis: The purpose of this study was to compare BB patterns and concomitant injuries after noncontact ACL tears between pivoting sports athletes and alpine

Background: Although a recent systematic review found that latissimus dorsi tendon transfer (LDTT) granted comparable outcomes in shoulders with massive rotator cuff tears (mRCTs) versus those with failed rotator cuff repair (RCR), some studies found inferior outcomes after failed RCR. Purpose: To compare the clinical and functional outcomes, as well as complication rates, of patients who underwent

Background: The utilization of new pitch-tracking metrics has driven player development and provides more predictive pitch-specific data on physical characteristics and performance. Given the differences in each pitcher's arsenal, these pitch-specific metrics provide new potential variables to investigate ulnar collateral ligament (UCL) injury risk. Purpose: To evaluate the association of several pitch-specific

Background: Multiple techniques have been utilized to measure posterior tibial slope (PTS) without consensus on which imaging modality, view, and axis combination is most consistent for risk assessment and preoperative planning in primary and revision anterior cruciate ligament (ACL) surgery. An exclusively proximal-based measurement of PTS has yet to be defined. Purpose/Hypothesis: The purpose of

Background: Patients with posterolateral rotational instability (PLRI) of the elbow exhibit a higher degree of joint incongruence on magnetic resonance imaging (MRI) than patients without PLRI. However, the influence of joint hypermobility and position of the elbow in healthy participants is yet unknown. Purpose: To analyze the influence of general hypermobility and elbow joint position on joint congruence

Background: A steep posterior tibial slope (PTS) and excessive anterior tibial subluxation of the lateral compartment (ASLC) have been considered to be associated with inferior graft outcomes in primary anterior cruciate ligament (ACL) reconstruction (ACLR). Case series studies have demonstrated that combined slope-reducing tibial osteotomy can greatly improve knee functional scores and stability in

Background: Ankle sprains in American football resulting from external rotation and eversion (EE) mechanisms remain a persistent injury that often involves player-to-player contact. Currently, there is little research that describes the frequency or source of this contact in American football and what scenarios are responsible for these injuries across different player positions. Purpose: To identify

Background: One-fifth of patients with femoroacetabular impingement (FAI) have bilateral symptoms. Performing bilateral hip arthroscopy on the same day minimizes the overall rehabilitation period compared with staged bilateral surgery, but most studies of outcomes from simultaneous surgery are in small cohorts. Purpose/Hypothesis: The purpose was to compare clinical outcome and revision rates between

Background: The superficial medial collateral ligament (sMCL) is commonly injured, with treatment varying based on associated injuries, tear grade, and location. However, the prevalence of different tear locations and the predictors of tear types have not been studied. Purpose: To evaluate the interrater and intrarater reliability for a magnetic resonance imaging (MRI)–based sMCL classification system

Background: Anterior cruciate ligament (ACL) injuries are common in female basketball players, who have a 2 to 3 times higher risk for an ACL injury than their male counterparts. Improving our understanding of the situations and biomechanics that result in an ACL injury in basketball players may support the design of more effective programs to mitigate the injury risk. Purpose: To describe the injury

Background: Among high school baseball players, elbow injury is a significant career-threatening problem. Although structural abnormalities of the elbow joint, poor physical function, and faulty pitching mechanics have been identified as potential risk factors for this disorder, their relationship has not been fully elucidated. Purpose: To determine the interaction among these risk factors and, in

Background: As the incidence of primary hip arthroscopic surgery has increased, the incidence of revision hip arthroscopic surgery has also increased. Although many factors have been reported that predict clinical failure of hip arthroscopic surgery, the outcomes of primary versus revision hip arthroscopic surgery are unknown. Purpose: To perform a systematic review and meta-analysis comparing the

Background: Rotator cuff disease is prevalent and can cause significant disability. Local subacromial corticosteroid injections (CSIs) have been a mainstay of nonoperative management despite concerns regarding their potential for adverse effects on tendon and muscle tissue. We identified 3 potential molecular targets that could be inhibited by alternative, currently available treatments. Purpose: To

Background: Distal femoral osteotomy (DFO) use is increasing in popularity, and popliteal artery injury during DFO can be devastating. Purpose: To determine the safe sawing angles in DFO to prevent popliteal artery injury by analyzing the artery's course and the distances from key structures within the osteotomy plane. Study Design: Descriptive laboratory study. Methods: Three-dimensional images of

Background: The best management of irreparable rotator cuff tears remains uncertain, with multiple new techniques introduced over the past 2 decades. Two options for treatment are arthroscopic debridement and biceps tenotomy, or the subacromial balloon spacer. Early trial results favored the former option, but the 2-year results have not yet been reported. Purpose: To report the 2-year follow-up outcomes

Background: Score cutoffs of clinically important outcome values such as the minimal clinically important improvement (MCII), substantial clinical benefit (SCB), and Patient Acceptable Symptom State (PASS) are population and treatment specific. In patients with nonarthritic hip-related pain, numerous score cutoffs have been calculated for use after surgical treatment, but they have not been established

Background: There is growing interest in sagittal plane malalignment as a risk factor for patellofemoral chondral wear and, correspondingly, as an important measure to correct when performing certain tibial tubercle osteotomy (TTO) procedures. However, a radiographic method to measure anteriorization after TTO has not been described. Purpose: To develop and validate a radiographic method of measuring