BACKGROUND: The majority of scapula fractures have historically been treated non-operatively. The current literature describing patient outcomes following scapula fractures is limited. Our objective was to determine differences in outcomes between operatively and non-operatively treated scapular fractures. The goal of our study was to provide an updated and comprehensive systematic review for scapula body, neck, and glenoid fractures focusing on several outcomes including union rate, return to work, pain, shoulder active range of motion, strength, functional scores, and any recorded complications.
METHODS: The PRISMA methodology was followed for this systematic review. Articles were obtained from the PubMed/Medline database using the following search terms: scapula body OR scapula neck OR intra-articular glenoid AND fracture. Additional articles were obtained by searching the bibliographies of included references. Studies were included if they contained clinical data on one or more of our study objectives and contained participants with a scapular body, neck, and/or glenoid fracture who were at least 16 years old. A total of 35 papers, with 822 total cases were included. Studies chosen were assessed for level of evidence and reviewed for data pertaining to the current study objectives. All cases of scapula fractures found throughout the literature were analyzed for outcome data. Outcomes studied included union rate, return to work, pain, shoulder active range of motion, strength, functional scores, and recorded complications.
RESULTS: The overwhelming majority of scapula fractures go on to union. The majority of patients will eventually return to work. Persistent post-injury pain is unfortunately common. Shoulder range of motion and strength are decreased when compared to the contralateral shoulder. Non-operative glenoid fractures have the lowest reported functional scores. Malunion, need for additional surgeries, and post-traumatic arthritis were the most common complications.
CONCLUSIONS: When treating scapula fractures, orthopedic surgeons must consider the specific fracture pattern, as well as patient specific goals. Risks and benefits of both operative and non-operative management should be discussed with the patient including the exceptionally low non-union rate regardless of treatment option and that persistent pain following injury is unfortunately common.

BACKGROUND: Shoulder osteoarthritis can cause significant pain and disability. It is thought that the wider principles of osteoarthritis management can be applied in the management of people with shoulder osteoarthritis, but most prior research has been conducted with people experiencing osteoarthritis of the hip and knee. There is a paucity of evidence to guide the non-surgical management of shoulder osteoarthritis and limited understanding of current physiotherapy practice.
OBJECTIVE: We aimed to investigate the current treatment recommendations by physiotherapists in the UK for people with shoulder OA.
METHODS: An online survey using a clinical vignette was designed and distributed to UK registered physiotherapists with experience of managing people with shoulder osteoarthritis, via social media and professional networks. Descriptive statistics were used to analyse demographic and multiple-choice questions, and free text responses were summarised narratively.
RESULTS: 114 respondents accessed the survey with 110 valid responses; 105 (95%) respondents would offer face-to-face consultations, with 89 (81%) respondents expecting to offer 2-4 appointments. 108 (98%) respondents would offer advice/education; 79 (72%) would offer weight management; 82 (75%) prescribed exercises to improve movement; and 101 (92%) offered exercises to increase strength. If a person lived with obesity or had a treatment preference, the majority of respondents would change their recommendations.
CONCLUSIONS: This is the first survey of NHS physiotherapy practice for people with shoulder osteoarthritis. The responses largely align with NICE guidelines; despite this alignment, it is not known whether such guideline-based care is acceptable to people with shoulder osteoarthritis or clinically effective.

UNASSIGNED: To compare shoulder range of motion (ROM) in dominant vs. nondominant shoulder of competitive tennis players, and to determine whether shoulder ROM is different between younger and older players, or males and females.
UNASSIGNED: A search was performed on PubMed, Embase, and Epistemonikos on December 18, 2023. This study conforms to the principles of the Cochrane Collaboration and the Preferred Reporting Items for Systematic Reviews and Meta-analysis guidelines. Clinical studies or case reports on shoulder ROM including external rotation (ER; shoulder at 90° of abduction) and internal rotation (IR) in competitive, elite, or professional tennis players.
UNASSIGNED: We found 25 eligible studies that reported on a total of 18,534 tennis players, of which 20 studies reported the ROM for the dominant and nondominant side. Comparing dominant vs. nondominant shoulders revealed that dominant shoulders had significantly smaller IR (53.0° vs. 62.6°; P < .001). Comparing adults vs. children revealed that adults have significantly smaller IR (44.5° vs. 57.1°; P < .001) and ER (95.3° vs. 110.3°; P < .001). Comparing females vs. males revealed no significant differences in ER (113.4° vs. 104.9°; P = .360) or IR (54.3° vs. 56.4°; P = .710).
UNASSIGNED: IR in shoulders of tennis players is significantly smaller in dominant vs. nondominant sides (53.0° vs. 62.6°, P < .001), and significantly smaller in adults vs. children (44.5° vs. 57.1°, P < .001). These findings could be relevant in the context of physical preparation and training of tennis players, to monitor evolution of IR as a result of their sport and/or as they transition from childhood to adulthood.

UNASSIGNED: The incremental biological changes in the synovial microenvironment of the shoulder in acute and chronic instability that may contribute to joint degeneration are poorly understood. Proteomic analysis of synovial fluid in patients with shoulder instability may improve our understanding of proteins that are shed into shoulder synovial fluid after an injury.
UNASSIGNED: Injury-specific factors such as the direction of instability and the severity of glenoid and humeral bone loss are associated with the proteome of synovial fluid in patients with shoulder instability.
UNASSIGNED: Descriptive laboratory study.
UNASSIGNED: Synovial fluid lavage samples were compared between patients with anterior (n = 12) and posterior (n = 8) instability and those without instability (n = 5). Synovial proteins were identified with liquid chromatography-tandem mass spectrometry. Orthogonal validation of protein targets found to be significant on tandem mass spectrometry was performed in a separate set of prospective patients with Western blotting. Data were processed and analyzed, and P values were adjusted with the Benjamini-Hochberg method for multiple comparisons.
UNASSIGNED: A total of 25 patients were included. Tandem mass spectrometry identified 720 protein groups in synovial fluid of patients with shoulder instability. There were 4 synovial proteins that were significantly expressed in patients with anterior instability relative to posterior instability: periostin (POSTN) (adjusted P value = .03; log fold change [logFc] = 4.7), transforming growth factor beta-induced protein ig-h3 (adjusted P value = .05; logFc = 1.7), collagen type VI alpha-3 chain (adjusted P value = .04; logFc = 2.6), and coagulation factor V (adjusted P value = .04; logFc = -3.3). Among these targets, POSTN showed a moderate correlation with the Hill-Sachs lesion size (r = 0.7). Prospective validation with Western blotting confirmed a significantly higher level of POSTN in synovial fluid of patients with anterior instability (P = .00025; logFc = 5.1).
UNASSIGNED: Proteomic analysis enriched our understanding of proteins that were secreted into shoulder synovial fluid of patients with shoulder instability. The identification of POSTN, a proinflammatory catabolic protein involved with tissue remodeling and repair, as a significant target in anterior shoulder instability is a novel finding. Therefore, further study is warranted to determine the role that POSTN may play in the progression of bone loss and posttraumatic osteoarthritis.
UNASSIGNED: Proteomic analysis of synovial fluid in patients with shoulder instability improved our understanding of this abnormality after an injury.

The purpose of this review is to provide a comprehensive resource for shoulder proprioception assessment and its integration into clinical decision making as well as targeted rehabilitation protocols. Data for this review were acquired from peer-reviewed articles from computerized online databases, namely PubMed and Medline, published between 1906 and 2021. The development of digital/smart phone goniometers can improve shoulder joint range of motion (ROM) measurements and demonstrate comparable measurement accuracy to the universal standard goniometer. The inclinometer offers a portable and cost-effective method for measuring shoulder joint angles and arcs of motion in the vertical plane. Two types of dynamometers, the computerized isokinetic machine and the handheld hydraulic dynamometer, are reliable tools for objective shoulder rotator cuff strength assessment. Motion analysis systems are highly advanced modalities that create three-dimensional models of motion arcs using a series of cameras and reflective beads, offering unparalleled precision in shoulder proprioception measurement; however, they require time-consuming calibration and skilled operators. Advancements in wearable devices and compact mobile technology such as iPhone applications may make three-dimensional motion analysis more affordable and practical for outpatient settings in the future. The complex interplay between proprioception and shoulder dysfunction is not fully understood; however, shoulder proprioception can likely both contribute to and be caused by shoulder pathology. In patients with rotator cuff tears, glenohumeral osteoarthritis, and shoulder instability, clinicians can track proprioception to understand a patient\'s disease progression or response to treatment. Finally, rehabilitation programs targeting shoulder proprioception have shown promising initial results in restoring function and returning athletes to play.

UNASSIGNED: Destabilizing shoulder injuries are common in high school American football players; however, the rate of recurrent glenohumeral instability and return to play after arthroscopic labral stabilization surgery remains unknown.
UNASSIGNED: The purpose of this study was to determine the rate of recurrent instability on return to competitive high school football after arthroscopic shoulder labral stabilization and capsulorrhaphy procedures. It was hypothesized that the instability rate would be greater in players with more years of eligibility remaining (YER) to play at the high school level.
UNASSIGNED: Case series; Level of evidence, 4.
UNASSIGNED: Consecutive male high school football players with at least 1 YER who sustained at least 1 anterior traumatic inseason shoulder instability episode and underwent arthroscopic stabilization between 2012 and 2017 were identified. Patients and/or families were contacted by phone to discuss (1) recurrent instability episodes and (2) return to competitive sport and/or recreational athletic activity. Statistical analysis was conducted using chi-square tests to compare recurrent shoulder instability with return to play and YER.
UNASSIGNED: A total of 45 football players aged 14 to 17 years were included, with a mean follow-up of 4.1 years. Most patients (60%) chose not to return to competitive football, due mainly to fear of recurrent injury. Overall, the recurrent instability rate was 15.6% (7/45). The instability rate in players who returned to football was 16.7%, with 66.7% requiring revision surgery. The instability rate in patients who did not return to football was 14.8%, with no revision procedures required. In players who returned to football, the instability rate in YER group 4 was significantly higher than that in YER groups 1 to 3 (42% vs 10.5%, respectively, P = .03), with each year of play conferring an additional 10% risk of reinjury. There was a significant difference in the type of recurrent instability in players who returned to any sport versus those who did not (P = .029).
UNASSIGNED: High school football players who returned to competitive play after arthroscopic shoulder stabilization surgery experienced a higher rate of recurrent instability that was dependent on their YER. Over half of the players chose not to return to football, with fear of reinjury being the most common reason.

UNASSIGNED: The exact incidence of shoulder dislocation in the general population of the United States (US) has yet to be well studied.
UNASSIGNED: To establish the current incidence and patterns of shoulder dislocations in the US, especially regarding sports-related activity.
UNASSIGNED: Descriptive epidemiology study.
UNASSIGNED: This was a retrospective analysis of shoulder dislocations encountered in emergency departments in the US between 1997 and 2021 as recorded in the National Electronic Injury Surveillance System (NEISS). Data were further analyzed according to patient age, sex, and sports participation. Information from the United States Census Bureau was used to determine the overall incidence of dislocations.
UNASSIGNED: A total of 46,855 shoulder dislocations were identified in the NEISS database, representing a national estimate of 1,915,975 dislocations (mean 25.2 per 100,000 person-years). The mean patient age was 35.3 years. More than half of the dislocations (52.5%) were sports-related, and basketball (16.4%), American football (15.6%), and cycling (9%) were the sports most commonly associated with dislocation. Most dislocations (72.1%) occurred in men. This disparity by sex was more significant for sports-related dislocations (86.1% in men) than nonsports-related dislocations (56.7% in men; P < .001). With sports-related dislocations, people <21 years experienced a significantly higher proportion versus those >39 years (44.6% vs 14.9%; P < .001), while the opposite distribution was seen with nonsports-related dislocations (<21 years: 12% vs >39 years: 51.7%; P < .001). Women outnumbered men with shoulder dislocation among people >61 years.
UNASSIGNED: Sports-related shoulder dislocations were more common among younger and male individuals than older and female individuals. Contact sports such as basketball and American football were associated with more shoulder dislocations compared with noncontact sports.

In unstable shoulders, excessive anteroinferior position of the humeral head relative to the glenoid can lead to a dislocation. Measuring humeral head position could therefore be valuable in quantifying shoulder laxity. The aim of this study was to measure (1) position of the humeral head relative to the glenoid and (2) joint space thickness during passive motion in unstable shoulders caused by traumatic anterior dislocations and in contralateral uninjured shoulders. A prospective cross-sectional CT-study was performed in patients with unilateral anterior shoulder instability. Patients underwent CT scanning of both injured and uninjured side in supine position (0° abduction and 0° external rotation) and in 60°, 90°, and 120° of abduction with 90° of external rotation without an external load. Subsequently, 3D virtual models were created of the humerus and the scapula to create a glenoid coordinate system to identify poster-anterior, inferior-superior, and lateral-medial position of the humeral head relative to the glenoid. Joint space thickness was defined as the average distance between the subchondral bone surfaces of the humeral head and glenoid. Fifteen consecutive patients were included. In supine position, the humeral head was positioned more anteriorly (p = 0.004), inferiorly (p = 0.019), and laterally (p = 0.021) in the injured compared to the uninjured shoulder. No differences were observed in any of the other positions. A joint-space thickness map, showing the bone-to-bone distances, identified the Hill-Sachs lesion footprint on the glenoid surface in external rotation and abduction, but no differences on average joint space thickness were observed in any position.

UNASSIGNED: Many joint-preserving surgical interventions for cartilage defects of the knee have been adapted for use in the shoulder; however, there still exists no clear consensus for treatment. Thus, the purpose of this systematic review was to evaluate the outcomes of different interventions in patients with focal chondral lesions of the glenohumeral joint.
UNASSIGNED: A literature search was conducted using PubMed, Embase, and Medline. Patients who underwent a joint-preserving surgical procedure to treat a focal chondral defect of the glenoid, humeral head or both were included. Patients treated for diffuse cartilage defects or with shoulder arthroplasty were excluded.
UNASSIGNED: Ten studies were included, with follow-up data available for 194 shoulders. Eight joint-preserving procedures were evaluated, with microfracture being the most common. One study evaluating microfracture reported significant improvements in patient-reported outcomes at short-term and long-term follow-up compared to preoperative scores. Across all studies, 32 patients underwent subsequent shoulder surgery, with 22 being arthroplasties.
UNASSIGNED: We found improvements in patient-reported and functional outcomes across all studies. Although joint-preserving procedures have shown reasonable outcomes for focal chondral defects of the glenohumeral joint, long-term outcomes remain unknown, and the progression of osteoarthritis remains a concern. Higher quality evidence is required to make definitive recommendations.
UNASSIGNED: IV.

More than 80% of adult manual wheelchair users with spinal cord injuries will experience shoulder pain. Females and those with decreased shoulder dynamics variability are more likely to experience pain in adulthood. Sex-related differences in shoulder dynamics variability during pediatric manual wheelchair propulsion may influence the lifetime risk of pain. We evaluated the influence of sex on 3-dimensional shoulder complex joint dynamics variability in 25 (12 females and 13 males) pediatric manual wheelchair users with spinal cord injury. Within-subject variability was quantified using the coefficient of variation. Permutation tests evaluated sex-related differences in variability using an adjusted critical alpha of P = .001. No sex-related differences in sternoclavicular or acromioclavicular joint kinematics or glenohumeral joint dynamics variability were observed (all P ≥ .042). Variability in motion, forces, and moments are considered important components of healthy joint function, as reduced variability may increase the likelihood of repetitive strain injury and pain. While further work is needed to generalize our results to other manual wheelchair user populations across the life span, our findings suggest that sex does not influence joint dynamics variability in pediatric manual wheelchair users with spinal cord injury.