Subacromial impingement syndrome

Development of a musculoskeletal shoulder model considering anatomic joint structures and soft-tissue deformation for dynamic simulation

The shoulder joint has a high degree of freedom and an extremely complex and unstable kinematic mechanism. Coordinated contraction of the rotator cuff muscles that stop around the humeral head and the deltoid muscles and the extensibility of soft tissues, such as the joint capsule, labrum, and ligaments, contribute to shoulder-joint stability. Understanding the mechanics of shoulder-joint movement, including soft-tissue characteristics, is important for disease prevention and the development of a device for disease treatment. This study aimed to create a musculoskeletal shoulder model to represent the realistic behavior of joint movement and soft-tissue deformation as a dynamic simulation using a rigid-body model for bones and a soft-body model for soft tissues via a spring-damper-mass system. To reproduce the muscle-contraction properties of organisms, we used a muscle-expansion representation and Hill's mechanical muscle model. Shoulder motion, including the movement of the center of rotation in joints, was reproduced, and the strain in the joint capsule during dynamic shoulder movement was quantified. Furthermore, we investigated narrowing of the acromiohumeral distance in several situations to induce tissue damage due to rotator cuff impingement at the anterior-subacromial border during shoulder abduction. Given that the model can analyze exercises under disease conditions, such as muscle and tendon injuries and impingement syndrome, the proposed model is expected to help elucidate disease mechanisms and develop treatment guidelines.

Glenohumeral versus subacromial steroid injections for impingement syndrome with mild stiffness: a randomized controlled trial

BACKGROUND

The subacromial (SA) space is a commonly used injection site for treatment of impingement syndrome. For shoulder stiffness, glenohumeral (GH) injections are commonly performed. However, in cases of impingement syndrome with mild shoulder stiffness, the optimal site of steroid injection has yet to be identified.

METHODS

This prospective, randomized study compared the short-term outcomes of ultrasound-guided GH and SA steroid injections in patients who were diagnosed with impingement syndrome and mild stiffness. Each group comprised 24 patients who received either a GH or SA injection of 40 mg of triamcinolone. Range of motion and clinical scores were assessed before and 3, 7, and 13 weeks after the injection.

RESULTS

GH and SA injections significantly improved the range of motion and clinical scores after 13 weeks of follow-up. Notably, targeting the GH joint resulted in an earlier gain of forward elevation, external rotation, and internal rotation in 3 weeks (P<0.001, P=0.012, and P=0.002, respectively) and of internal rotation and a Constant-Murley score in 7 weeks (P<0.001 and P=0.046). Subsequent measurements were similar between the groups and showed a steady improvement in all ranges of motion and clinical scores.

CONCLUSIONS

GH injections may be more favorable than SA injections for treatment of impingement syndrome with mild stiffness, especially in improving the range of motion in the early period. However, the procedures showed similar outcomes after 3 months. Level of evidence: I.

Low-level laser therapy versus ultrasound therapy combined with home-based exercise in patients with subacromial impingement syndrome: A randomized-controlled trial

Objectives

The aim of this study was to evaluate the effects of low-level laser therapy (LLLT) and therapeutic ultrasound (US) combined with home-based exercise (HBE) versus HBE alone in patients with subacromial impingement syndrome (SAIS).

Patients and methods

Between March 2021 and July 2021, a total of 60 patients with SAIS (19 males, 41 females; mean age: 51.3±10.4 years; range, 30 to 70 years) were included. The patients were randomly allocated to an LLLT group (LG), an US therapy group (UG), and a control group (CG). The LLLT and US therapy programs were applied five times a week, for a total of 15 sessions. Home-based exercise programs and cold-pack therapy were administered to patients in each group. The patients were evaluated at baseline and one and three months of follow-up using the Visual Analog Scale (VAS) for pain during activity, at rest, and at night, and the Shoulder Pain and Disability Index (SPADI).

Results

All groups showed a significant improvement in the VAS and SPADI scores after the first month (p<0.05). The VAS activity pain score (p=0.008), SPADI pain score (p=0.003), SPADI disability score (p=0.012), and SPADI total score (p=0.003) significantly decreased in the LG compared to the CG at one month of follow-up. However, there were no significant differences in the outcome measures among the three groups at three months (p>0.05).

Conclusion

The LLLT combined with HBE is more effective than HBE program alone for relieving activity pain and improving shoulder functions in the short term. However, LLLT and US therapy do not provide additional effects in terms of pain and disability at three months.

[Subacromial shoulder impingement]

Impingement, especially subacromial impingement, is one of the most frequent causes of shoulder pain. It results in soft tissue pathologies due to constriction of the subacromial space. It can lead to tendon pathologies and bursitis. In addition to the clinical examination, imaging methods such as magnetic resonance imaging (MRI), MRI arthrography, ultrasound and X‑ray examinations are helpful in making a diagnosis or evaluating the cause of pain. Conservative treatment approaches, such as rest, medication, physiotherapy, manual therapy and infiltrations should primarily be used. If the symptoms do not improve after 3-6 months of conservative treatment, surgical treatment should be considered.

Exosome Cell Origin Affects In Vitro Markers of Tendon Repair in Ovine Macrophages and Tenocytes

Tendon injuries and disease are resistant to surgical repair; thus, adjunct therapies are widely investigated, especially mesenchymal stromal cells (MSCs) and, more recently, their extracellular vesicles (MSCdEVs), for example, exosomes. Thought to act on resident and infiltrating immune cells, the role of MSCdEVs in paracrine signaling is of great interest. This study investigated how MSCdEVs differ from analogs derived from resident (tenocyte) populations (TdEV). As macrophages play a significant role in tendon maintenance and repair, macrophage signaling was compared by cytokine quantification using a multiplexed immunoassay and tenocyte migration by in vitro scratch-wound analysis. TdEV-treated macrophages decreased IL-1 and increased MIP-1 and CXCL8 expression. In addition, macrophage signaling favored collagen synthesis and tenocyte bioactivity, while reducing proangiogenic signaling when TdEVs were used in place of MSCdEVs. These in vitro data demonstrate a differential influence of exosomes on macrophage signaling, according to cell source, supporting that local cell-derived exosomes may preferentially drive healing by different means with possible different outcomes compared to MSCdEVs. Impact Statement Adipose-derived mesenchymal stromal cell (AdMSC) exosomes (EVs) can improve tendon mechanical resilience, tissue organization, and M2 macrophage phenotype predominance in response to tendon injury. This active area of investigation drives great interest in the function of these exosomes as adjunct therapies for tendon disease, particularly rotator cuff tendinopathy. However, little is known about the effects of EVs as a function of cell source, nor regarding their efficacy in preclinical translational ovine models. Herein we demonstrate a differential effect of exosomes as a function of cell source, tenocyte compared to AdMSCs, on macrophage signaling and tenocyte migration of ovine cells.

Shoulder Impingement Syndrome

Shoulder impingement is the most common diagnosis for shoulder pain. Shoulder impingement syndrome has been scrutinized as a misleading "umbrella" term, due to its vague and nonspecific context. It is better subcategorized into subacromial, internal, and subcoracoid impingement. The evaluation and treatment algorithm for each is grossly similar. A thorough history, focused physical examination, and standard radiographs are the first steps. Advanced imaging with MRI or ultrasound may be useful. The mainstay of treatment includes physical therapy, anti-inflammatory medications, and injections. Surgical treatment is reserved for refractory cases, and includes decompression, debridement, and/or repair of injured structures.

Reliability of point-of-care shoulder ultrasound measurements for subacromial impingement in asymptomatic participants

Background

Rehabilitation is the key to management of patients with subacromial impingement syndrome to prevent disability and loss of function. While point-of-care musculoskeletal ultrasound aids clinical diagnosis of subacromial impingement syndrome, many patients do not demonstrate the classic findings of dynamic supraspinatus tendon impingement beneath the acromion on ultrasound. The objective of this study was to establish the most reliable shoulder ultrasound measurements for subacromial impingement, by evaluating the intra-rater and inter-rater reliability of measurements in asymptomatic participants.

Methods

Eighteen participants (9 women, 9 men, mean ± standard deviation: 34.6 ± 7.9 years of age) underwent bilateral shoulder ultrasound evaluations with measurements for subacromial impingement (acromiohumeral distance, acromion-greater tuberosity distance, supraspinatus tendon, subacromial-subdeltoid bursa, and subacromial-subdeltoid bursal fluid thickness) performed by two sports medicine physicians. Intra-class coefficients were calculated to determine the intra- and inter-rater reliability of shoulder ultrasound images and measurements.

Results

Intra-rater reliability for acromiohumeral distance (0.76–0.79), supraspinatus tendon (0.91–0.95), subacromial-subdeltoid bursa (0.76–0.84), and subacromial-subdeltoid bursal fluid thickness (0.75–0.81) was found to be good to excellent, whereas inter-rater reliability ranged from poor to moderate.

Conclusions

Acromiohumeral distance in neutral position and short axis ultrasound measurements of supraspinatus tendon, subacromial-subdeltoid bursa, and subacromial-subdeltoid bursal fluid thickness in the modified Crass position were the most reliable for subacromial impingement in asymptomatic participants. We recommend validation of these measurements in a symptomatic population to aid diagnosis and direct rehabilitation of patients with suspected subacromial impingement, and to increase point-of-care ultrasound uptake, availability, and training among rehabilitation professionals across health systems.

Conservatively Treated Symptomatic Rotator Cuff Tendinopathy May Progress to a Tear

Purpose

To determine the likelihood of, and risk factors for, progression of rotator cuff tendinopathy to tear on magnetic resonance imaging (MRI) in patients treated conservatively for minimum 1 year.

Methods

Patients in the Veterans Health Administration (VHA) Corporate Data Warehouse with a diagnosis of rotator cuff injury and sequential MRI of the same shoulder at least 1 year apart were identified. Presenting MRIs were reviewed to select patients with tendinopathy, while excluding those with a normal appearing cuff, tear, or prior repair. Tear progression was defined as development of a partial or full-thickness tear on follow-up MRI. Chart review was performed for demographic and clinical data. Descriptive statistics and inter-observer and intra-observer reliability were calculated. Discrete and continuous variables were compared between patients who progressed and those who did not using chi-square, Fisher’s Exact, Student’s t, and Mann-Whitney U-test.

Results

In the VHA database, 135 patients had an initial MRI demonstrating rotator cuff tendinopathy. On subsequent MRI at mean 3.4 year follow-up, 39% of patients had progressed to a tear. When grouped on the basis of time between scans as 1 to 2 years, 2 to 5 years, or over 5 years, the rate of progression was 32%, 37%, and 54% respectively. No factors were associated with progression.

Conclusions

Among patients with symptomatic rotator cuff tendinopathy that remained symptomatic at a minimum of 1 year and obtained a follow-up MRI, 39% progressed to a partial or full-thickness tear. None of the factors evaluated in this study correlated with progression from tendinopathy to tear. When patients were grouped based on time between scans as 1 to 2 years, 2 to 5 years, or more than 5 years, the rate of progression from tendinopathy to tear was 32%, 37%, and 54%, respectively.

3D imaging has good specificity but poor sensitivity for the diagnosis of pathologies of the long head of the biceps: a systematic review and meta-analysis

PURPOSE

To systematically review and meta-analyse the literature to determine which three-dimensional (3D) imaging modality provides the best diagnostic accuracy to detect pathologies of the long head of the biceps tendon (LHBT).

MATERIALS AND METHODS

A search was performed on PubMed, Embase^®, and Cochrane. Studies that compared the diagnostic accuracy of 3D imaging modalities versus arthroscopy for the assessment of LHBT pathologies were included. Studies assessing superior labral anterior posterior (SLAP) lesions were excluded.

RESULTS

Fifteen studies were included; nine were eligible for meta-analysis. Six studies on instability indicated a sensitivity of 0.68 (CI 0.46-0.84) and specificity of 0.76 (CI 0.68-0.82). Four studies on full-thickness tears indicated a sensitivity of 0.56 (CI 0.28-0.81) and specificity of 0.97 (CI 0.93-0.99). Four studies on partial-thickness tears indicated a sensitivity of 0.52 (CI 0.20-0.82) and specificity of 0.64 (CI 0.25-0.91). Two studies on any tear indicated a sensitivity of 0.58 (CI 0.28-0.83) and specificity of 0.99 (CI 0.93-1.00). Only one study on other pathologies indicated a sensitivity of 0.61 and specificity of 0.84.

CONCLUSION

To diagnose LHBT pathologies, 3D imaging modalities overall have low-to-moderate sensitivity, but high-to-excellent specificity. The consistency in reported sensitivity is generally poor, while the consistency and reported specificity is good for the detection of instability, full-thickness tears and any tear, but poor for the detection of partial-thickness tears. 3D imaging may be adequate to rule out LHBT pathologies, but are not sufficiently reliable to confirm the presence of such pathologies.

LEVEL OF EVIDENCE

III.

Coracoid Impingement and Morphology Is Associated with Fatty Infiltration and Rotator Cuff Tears

This study describes measurements between the coracoid, glenoid, and humerus; characterizes coracoid shape, rotator cuff fatty infiltration, and quantitatively evaluates coracoid impingement and its association with anterosuperior rotator cuff tears (ASCT). 193 shoulder magnetic resonance imaging (MRI) scans demonstrating: rotator cuff tear; isolated tear of the supraspinatus; tear of supraspinatus and subscapularis, were included. MRI measurements included coracohumeral interval (CHI), coracoid overlap (CO), coracoid recess (CR), coracoglenoid angle (CGA), and coracoglenoid interval (CGI) on axial slices; acromiohumeral interval (AHI) on coronal slices; and coracohumeral interval (CHI) and coracoacromial ligament (CAL) thickness on sagittal slices. The coracoid shape was classified as flat, curved, or hooked. An Independent T-test was used to compare the MRI measurements and the different rotator cuff tear groups. In 79% of the patients with ASCT tears, the coracoid was curved. Axial CHI, CGA, sagittal CHI, and AHI were decreased in ASCT when compared to no tears and isolated supraspinatus tears (p < 0.05). CO was increased in ASCT compared to no tears and isolated supraspinatus tears (p < 0.05). Patients with an ASCT had a significantly increased subscapularis and supraspinatus Goutallier fatty infiltration score when compared to no tear and isolated supraspinatus tears (p < 0.05). These quantitative measurements may be useful in identifying patients at risk for ASCT. Level of Evidence III.

Volumetric evaluation of the subacromial space in shoulder impingement syndrome

INTRODUCTION

Shoulder impingement syndrome is evaluated radiologically with two-dimensional measurement parameters. None of these measurement parameters accurately reflect the three-dimensional geometry. The purpose of this study was to evaluate the volumetric status of the subacromial space in patients with shoulder impingement syndrome and to investigate its relationship with two-dimensional parameters.

HYPOTHESIS

The primary hypothesis of this study is that subacromial volume is reduced in patients with impingement syndrome. The second hypothesis is that the sagittal plane morphology of the acromion reflects the subacromial volume better than the coronal plane morphology.

PATIENTS AND METHODS

This retrospective study consisted of a total of 52 participants: 26 patients with impingement syndrome and 26 controls. Volumetric measurements were performed with using magnetic resonance imaging. The relationship between humerus and acromion was evaluated by acromiohumeral distance. The sagittal plane morphology of the acromion was evaluated with an objective acromial angle, while the coronal plane morphology was evaluated with a lateral acromial angle. The radiological parameters between groups were compared.

RESULTS

The mean subacromial volume was significantly smaller in the impingement group compared to the control group (p=0.01). The subacromial volume had a negative correlation with the objective acromial angle (R=-0.46; p=0.01) The mean tendon volume was significantly higher in the impingement group (p<0.001). The mean acromiohumeral distance in the impingement group (6.8mm±1.0mm), was calculated to be significantly lower than the control group (10.1mm±1.5mm) (p<0.001). There was a positive moderate correlation between subacromial volume and acromiohumeral distance (R=0.61; p=0.01).

DISCUSSION

This is the first study to demonstrate a reduction in subacromial volume in patients with impingement syndrome. The sagittal plane morphology of the acromion, rather than the coronal plane, appears to be more closely related to the subacromial volume.

LEVEL OF EVIDENCE

III; case-control study.

Publication Trends and Hot Spots in Subacromial Impingement Syndrome Research: A Bibliometric Analysis of the Web of Science Core Collection

Background

In recent years, the research on subacromial impingement syndrome (SIS) has gradually increased. Although the research directions are diverse, the overall research status and trend are not clear.

Objective

The aim of our study was to use bibliometric analysis to identify the trends in SIS-related research and to analyze the most highly cited scientific publications on SIS.

Methods

All data were retrieved from the Web of Science Core Collection database, and the year of publications, countries, journals, institutions and total number of citations were extracted and analyzed. The results related to countries, institutions and keywords were then analyzed using VOSviewer software and bibliometrics online analysis platform. And, we also identified the 100 most cited articles on SIS.

Results

A total of 548 articles related to AIS were identified. The frequency of publication on SIS has increased substantially over time. Among all countries, Turkey has contributed the most publications on SIS (n=118). The institution with the most articles was Istanbul University (n=17). Journal of Shoulder and Elbow Surgery topped the list of journals and has published 19 SIS-related publications. The hotspot of research changed from the former arthroscopic surgery to physical therapy and rehabilitation.

Conclusion

The scientific research on SIS has rapidly expanded in recent years. This study represents the first bibliometric analysis of SIS, gives us a systematic and comprehensive summary into the development of SIS.

National Trends Show Declining Use of Arthroscopic Subacromial Decompression Without Rotator Cuff Repair

PURPOSE

The goal of this study was to investigate trends in the United States for arthroscopic subacromial decompression (aSAD) and open SAD (oSAD) with and without rotator cuff repair (RCR) between 2010 and 2018.

METHODS

The PearlDiver Mariner claims database was queried using CPT codes for open and arthroscopic subacromial decompression and rotator cuff repair. Patient cohorts were developed for those undergoing aSAD or oSAD between 2010 and 2018, then segmented by whether RCR was performed simultaneously. Annual incidence was analyzed, as were associated diagnosis codes, and concomitant shoulder-associated procedures performed on the same day.

RESULTS

The PearlDiver Mariner dataset from 2010 to 2018 included 186,932 patients that underwent aSAD, while 9,263 patients underwent oSAD. The total incidence of aSAD declined from 118.0 to 71.3 per 100,000 (39.6% decrease) (P < .001). This change was due primarily to a decreasing incidence of aSAD performed without RCR, which declined from 66.3 to 25.5 per 100,000 (61.5% decrease) (P < .001). During the same period, the incidence of aSAD combined with RCR remained relatively stable, from 51.7 to 45.8 per 100,000 (11.5% decrease) (P = .27). The overall incidence of oSAD declined from 7.1 to 2.2 per 100,000 (68.1% decrease) (P < .001).

CONCLUSIONS

The overall rate of aSAD has declined in recent years, primarily due to a large decrease in the incidence of aSAD without RCR as an isolated treatment for rotator cuff disorders.

CLINICAL RELEVANCE

Prior studies have demonstrated a rising incidence of SAD; however, high-level clinical evidence and clinical practice guidelines have challenged its efficacy. It is important for orthopaedic surgeons to understand evolving national trends in management among their peers.

Editorial Commentary: Denial of Payment Limits Patient Access to Musculoskeletal Procedures: What Can Willie Sutton Teach Us About the Decreasing Incidence of Acromioplasty?

Arthroscopic acromioplasty is one of the most commonly performed orthopedic surgical procedures. The indication for performing an acromioplasty has traditionally been based on the mechanical theory of impingement of the coracoacromial arch on the soft tissues of the rotator cuff footprint. Orthopedic surgeons have recommended surgically decompressing this phenomenon for six decades to eliminate shoulder pain and restore function. Recent high-level studies have cast doubt on the value of acromioplasty compared to other nonoperative treatment modalities. There is also an increased recognition and awareness that rotator cuff disease is as much a degenerative and senescent process as it is a mechanical one. There is now good evidence that the incidence of acromioplasty is falling significantly, especially in treatment scenarios that involve an intact rotator cuff. The cause of this decrease must be understood as multifactorial and related to both the clinical evidence and the economics and reimbursement policy concerning acromioplasty. Like many other high-volume and elective orthopedic surgical procedures, third-party reimbursement policy dictates patient access to treatments. Yet, current and future literature and clinical expertise determine proper indications for acromioplasty. Doctors are in the best position to indicate proper patient care.

A Targeted Approach to Post-Mastectomy Pain and Persistent Pain following Breast Cancer Treatment

Persistent pain following treatment for breast cancer is common and often imprecisely labeled as post-mastectomy pain syndrome (PMPS). PMPS is a disorder with multiple potential underlying causes including intercostobrachial nerve injury, intercostal neuromas, phantom breast pain, and pectoralis minor syndrome. Adding further complexity to the issue are various musculoskeletal pain syndromes including cervical radiculopathy, shoulder impingement syndrome, frozen shoulder, and myofascial pain that may occur concurrently and at times overlap with PMPS. These overlapping pain syndromes may be difficult to separate from one another, but precise diagnosis is essential, as treatment for each pain generator may be distinct. The purpose of this review is to clearly outline different pain sources based on anatomic location that commonly occur following treatment for breast cancer, and to provide tailored and evidence-based recommendations for the evaluation and treatment of each disorder.

Supraspinatus-to-Glenoid Contact Occurs During Standardized Overhead Reaching Motion

Background:

Rotator cuff tears may result from repeated mechanical deformation of the cuff tendons, and internal impingement of the supraspinatus tendon against the glenoid is one such proposed mechanism of deformation.

Purpose:

To (1) describe the changing proximity of the supraspinatus tendon to the glenoid during a simulated overhead reaching task and (2) determine the relationship between scapular morphology and this proximity. Additionally, the patterns of supraspinatus-to-glenoid proximity were compared with previously described patterns of supraspinatus-to-coracoacromial arch proximity.

Study Design:

Descriptive laboratory study.

Methods:

Shoulder models were created from magnetic resonance images of 20 participants. Standardized kinematics were imposed on the models to simulate functional reaching, and the minimum distances between the supraspinatus tendon and the glenoid and the supraspinatus footprint and the glenoid were calculated every 5° between 0° and 150° of humerothoracic elevation. The angle at which contact between the supraspinatus and the glenoid occurred was documented. Additionally, the relationship between glenoid morphology (version and inclination) and the contact angle was evaluated. Descriptive statistics were calculated for the minimum distances, and glenoid morphology was assessed using Pearson correlation coefficients and simple linear regressions.

Results:

The minimum distances between the tendon and the glenoid and between the footprint and the glenoid decreased as elevation increased. Contact between the tendon and the glenoid occurred in all participant models at a mean elevation of 123° ± 10°. Contact between the footprint and the glenoid occurred in 13 of 20 models at a mean of 139° ± 10°. Less glenoid retroversion was associated with lower tendon-to-glenoid contact angles (r = –0.76; R² = 0.58; P < .01).

Conclusion:

This study found that the supraspinatus tendon progressively approximated the glenoid during simulated overhead reaching. Additionally, all participant models eventually made contact with the glenoid by 150° of humerothoracic elevation, although anatomic factors influenced the precise angle at which contact occurred.

Clinical Relevance:

Contact between the supraspinatus and the glenoid may occur frequently within the range of elevation required for overhead activities. Therefore, internal impingement may be a prevalent mechanism for rotator cuff deformation that could contribute to cuff pathology.

Subacromial Platelet-Rich Plasma Injections Decrease Pain and Improve Functional Outcomes in Patients With Refractory Rotator Cuff Tendinopathy

PURPOSE

The purpose of this study was to evaluate the effect of subacromial platelet-rich plasma (PRP) injections in patients with refractory rotator cuff tendinopathies based on pain improvement, functional outcomes, sleep disturbances, and return to sports to the same level as before the injury.

METHODS

Between March 2019 and October 2019, 50 patients with rotator cuff tendinopathy refractory to conservative treatment were treated with one subacromial PRP injection in our institution. Magnetic resonance imaging was performed in all patients to confirm diagnosis. The visual analog scale (VAS) was used to evaluate pain. Range of motion, the American Shoulder and Elbow Surgeons (ASES) score, and the Constant score were used to assess functional outcomes. Eighty percent of the patients (40 of 50 patients) and 86% of the patients (43 of 50 patients) achieved a clinically significant improvement that exceeded the substantial clinical benefit for the ASES and Constant scores, respectively. The Pittsburgh Sleep Quality Index was used to assess sleep disorders. Return to sports was also evaluated. The mean follow-up was 12 months, and the mean (SD) age was 37.3 (9.3) years.

RESULTS

All mobility parameters evaluated improved significantly after treatment. The VAS, ASES, and Constant scores showed statistical improvement after the injection (P < .001). Sleep disturbances were resolved in 86% of the patients. Of the 32 patients who practiced sports before the injury, 84% returned to sports and 78% returned to the same level. There were no complications associated with the procedure.

CONCLUSIONS

In most patients with refractory rotator cuff tendinopathy, subacromial injections of leukocyte-rich PRP significantly decreased pain, improved functional outcomes, and resolved sleep disturbances. Moreover, most of the athletes returned to sports at the same level they had before the injury.

LEVEL OF EVIDENCE

Level II, prospective cohort study.

Quantification of acromioplasty. Systematic review of the literature

INTRODUCTION

Acromioplasty is controversial. Technically, it consists in bone resection, but there is no gold-standard technique and resection is often not quantified. The aims of the present study were 1/to assess the methodological quality of studies of acromioplasty; 2/to identify reports in which acromioplasty was quantified; and 3/to assess any correlation between clinical results and resection quantity.

MATERIAL AND METHODS

A systematic literature review was performed on PRISMA criteria in the PubMed, Springer and Ovid databases, including all articles in French or English referring to acromioplasty. Articles were analyzed by 2 surgeons and those with complete procedural description were selected. 1/Methodology was assessed on 3 grades according to aim of acromioplasty, intraoperative assessment of resection, and postoperative radiologic assessment. 2/Results were extracted from articles with robust methodology and quantitative data. 3/Correlations were assessed between clinical results and resection quantity.

RESULTS

Out of the 250 articles retrieved, 94 were selected. 1/44 of these (47%) specified the aim of the acromioplasty, 53 (56%) included an intraoperative clinical assessment criterion, and 13 (14%) included postoperative radiographic assessment. Methodologic quality was insufficient in 33 articles (35%), poor in 23 (24%) and robust in 38 (40%). 2/Seven articles (7.5%) included quantitative results. 3/Three articles assessed correlation between clinical results and resection quantity, but only 1 used reproducible radiographic assessment by critical shoulder angle (CSA); this study reported a significant positive correlation between clinical results and decreased CSA.

CONCLUSION

Methodology in studies of acromioplasty was largely insufficient and resection was usually not quantified. Current data to assess the usefulness of the procedure are sparse. We advocate including a Checklist for Acromioplasty Studies in the methodology of future studies. There is at present no gold-standard for assessing and quantifying acromial resection. CSA seems contributive, but other methods might be worth developing.

LEVEL OF EVIDENCE

IV; systematic review of level 1-4 studies.

Effect of Microcurrent Stimulation on Pain, Shoulder Function, and Grip Strength in Early Post-Operative Phase after Rotator Cuff Repair

Background and Objectives: The purpose of this study was to investigate the effects of microcurrent stimulation on pain, shoulder function, and grip strength in patients with rotator cuff repair. Materials and Methods: This randomized single-blind controlled trial was conducted on inpatients of the rehabilitation department, and included 28 patients who underwent rotator cuff repair. Participants were randomly assigned to the experimental group (n = 14), treated with microcurrent stimulation, and the control group (n = 14), treated with false microcurrent stimulation. The microcurrent stimulation administered to the experimental group underwent general physical therapy and microcurrent stimulation three times a week for 4 weeks. Results: Changes in pain, range of motion in shoulder, simple shoulder test, and grip strength were assessed before and after the intervention. Both groups showed a significant decrease in pain and shoulder function (t = 27.412, 22.079, 19.079, and 18.561; p < 0.001), and grip strength showed a significant increase (t = −8.251 and −9.946; p < 0.001). The experimental group that underwent microcurrent stimulation exhibited a significant effect on pain, shoulder function, and grip strength compared with the control group that underwent false microcurrent stimulation (t = −2.17, −2.22, and 2.213; p = 0.039, 0.035, and 0.036). Conclusions: This study confirmed that microcurrent stimulation is effective for the treatment of rotator cuff repair patients.

Management Options for Shoulder Impingement Syndrome in Athletes: Insights and Future Directions

Athletes participating in overhead sports are at particularly high risk of shoulder impingement syndrome. Subcoracoid impingement is defined as impingement of the anterior soft tissues of the shoulder between the coracoid process and the lesser tuberosity. Subacromial impingement syndrome (SIS) occurs due to extrinsic compression of the rotator cuff between the humeral head and coracoacromial structures or intrinsic degeneration of the supraspinatus tendon and subsequent superior migration of the humerus. Internal impingement is a major cause of shoulder pain in overhead athletes, and it occurs due to repetitive impingement of the articular surface of the rotator cuff with the glenoid during maximum abduction and external rotation of the arm. When examining athletes with suspected impingement of the shoulder, it is important to discuss the sport-specific motion that regenerates the symptoms and perform a combination of physical examination tests to improve the diagnostic accuracy. Radiographic evaluation is recommended, and the extent of soft tissue abnormalities can be assessed on ultrasound or magnetic resonance imaging of the shoulder. Management of shoulder impingement syndrome can be conservative or operative, based on the severity and chronicity of symptoms and the associated structural abnormalities. This review provides an update on the management of SIS, subcoracoid impingement, and internal impingement in the athletic population.

The effects of a single-dose subacromial injection of a nonsteroidal anti-inflammatory drug in geriatric patients with subacromial impingement syndrome: a randomized double-blind study

Background

As nonsteroidal anti-inflammatory drugs (NSAIDs) and steroids have similar effects, steroids can be avoided to reduce adverse effects. This study aimed to compare the differences in symptom improvement after subacromial injection of steroids or NSAIDs.

Methods

Sixty patients with rotator cuff syndrome for at least 3 months were enrolled and divided into steroid and NSAID groups. The steroid group received a mixture of 1 mL of triamcinolone acetonide (40 mg/mL) and 1 mL of lidocaine hydrochloride 2%, while the NSAID group received a mixture of 1 mL of Ketorolac Tromethamine (30 mg/mL) and 1 mL of lidocaine hydrochloride 2%. The patients were assessed before and at 3, 6, and 12 weeks after the procedure. Shoulder scores from visual analog scale (VAS), American Shoulder and Elbow Surgeons (ASES), and University of California Los Angeles (UCLA) were used for evaluation.

Results

Both groups showed improvements in the clinical outcomes. Overall VAS, ASES, and UCLA scores improved from 6.9, 32.7, and 16.0 before the procedure to 2.0, 1.2, and 1.1; 81.5, 87.6, and 88.5; and 29.7, 31.8, and 32.0 at weeks 3, 6, and 12 weeks after the procedure, respectively. Twenty-six patients (86.7%) in the steroid group and 28 (93.3%) in the NSAID group reported satisfactory treatment outcomes. There were no significant differences in the outcomes between the two groups (p=0.671).

Conclusions

Subacromial injection of NSAIDs for rotator cuff tendinitis with shoulder pain had equivalent outcomes with those of steroid injection at the 12-week follow-up.

Effectiveness and safety of fluoroscopy-guided acupuncture for subacromial impingement syndrome: A randomized, patient-assessor blind, parallel clinical trial

Background

Subacromial impingement syndrome (SIS) is one of the most common causes of shoulder pain, and acupuncture treatment is widely used as treatment. However, no studies have examined image-guided acupuncture for SIS. This study evaluated the effectiveness and safety of low-dose X-ray guided acupuncture (LA) in patients with SIS.

Methods

A total of 54 patients with SIS were randomly allocated to the LA group and the conventional acupuncture (CA) group. Two acupuncture treatment sessions were conducted for a week, and follow up was conducted after three weeks. The primary outcome was pain intensity measured by the visual analogue scale (VAS) during the Neer and Hawkins test. The incidence rate of shoulder impingement sign, the modified Constant-Murley score (CMS) and the Shoulder Pain and Disability Index (SPADI) were assessed as other outcomes. All indicators were assessed at baseline and after one week and three weeks. For safety evaluation, adverse events were monitored in both groups.

Results

The change in pain during the Neer test after one week from baseline was more significant in the LA group than in the CA group (p=0.008). However, the Hawkins test did not show a difference between the two groups. The incidence rate of shoulder impingement sign and the changes in CMS and SPADI were not significantly different between the two groups at one week, but after three weeks, SPADI was more significantly improved in the LA group (p=0.024). No adverse events were related to this trial.

Conclusion

LA was more effective than CA in relieving pain and improving function in terms of VAS and SPADI.

Trial registration

This study was registered on 23 March 2018 at the Clinical Research Information Service: KCT0002751.

The incidence of impingement syndrome in cases of cervical radiculopathy: An analysis of 220 cases

BACKGROUND

We hypothesized that cervical radiculopathy (CR) has a role in subacromial impingement syndrome (SAIS) etiology, which cannot be directly connected to anatomical causes.

OBJECTIVE

We aimed to investigate the presence of cervical radiculopathy in patients with SAIS diagnosed clinically and radiologically.

METHODS

Patients who had a clinical and radiological SAIS diagnosis between 2014 and 2016 were included in the study. Patients with secondary causes that led to SAIS were excluded. Cervical MRI of all patients with SAIS was examined for cervical radiculopathy.

RESULTS

A significant (p< 0.05) relationship was found between SIAS and the presence of root compression on the same side. 35% of the patients with SIAS had root compression on the same side.

CONCLUSIONS

Cervical radiculopathy and shoulder impingement syndrome can be easily confused due to the similarity of the symptoms and the anatomical proximity of the lesions. Although both diseases can occur with different mechanisms, we believe that there is a cause and effect relationship between them.

Scapular Kinematics in Athletes With and Without Rotator Cuff Tendinopathy: A Systematic Review

Context: Rotator cuff tendinopathy is one of the most frequently reported shoulder injuries in athletes of overhead sports. Abnormal scapular kinematics has been proposed as one of the contributing factors of rotator cuff tendinopathy in overhead athletes. Objectives: To review the literature on 3-dimensional scapular kinematics in overhead athletes with and without rotator cuff tendinopathy. Evidence Acquisition: Electronic databases (Cochrane Library, MEDLINE, Embase, and PubMed) were searched from inception to September 2017. In addition, the reference lists of the articles that met the inclusion criteria were also searched. We included studies that compared the changes in 3-dimensional scapular kinematics in athletes with and without rotator cuff tendinopathy. Two reviewers independently examined the quality of studies by using the modified Downs and Black checklist. Evidence Synthesis: A total of 9 studies (a total of 332 athletes, mean age 23.41 [2.62] y) were included in the final analysis. The methodological quality was low (modified Downs and Black checklist = 9/15). Our findings showed a consistent pattern of increased scapular anterior tilting and internal rotation in the dominant shoulders than the nondominant shoulders of athletes who participated in overhead sports. Athletes of overhead sports seem to demonstrate an increase in scapular upward rotation during arm elevation when compared with nonathlete individuals. However, there is no consensus on the scapular kinematics pattern in athletes with rotator cuff tendinopathy when compared with healthy controls. Conclusion: Findings demonstrated that changes in scapular kinematics were observed in overhead athletes. However, all the included studies were cross-sectional studies with small sample size and diverse sports participation, whether changes in scapular kinematics may contribute to rotator cuff tendinopathy in overhead athletes warrants more high-quality prospective studies.

Arthroscopic treatment of an unusual distal clavicle ostheochondroma causing rotator cuff impingement: case report and literature review

Chronic shoulder impingement is one of the most common causes of shoulder pain. Intrinsic, extrinsic and secondary factors play a role in this syndrome; however the etiology of the pathology is still under debate. In rare cases, it can be caused by tumors, such as an osteochondroma. In the present study, a 49-year-old patient presented with shoulder pain for 6 months. Initially he underwent conservative treatment, without relief of symptoms. Xrays and MRI were then performed and showed the presence of an exostotic formation on the undersurface of the lateral third of the clavicle. The formation was arthroscopically removed. Histologic examination confirmed the diagnosis of osteochondroma. After surgery, the patient resumed fully activities with no symptoms within 3 months. At 1 year follow up, there are still no clinical or radiological signs of recurrence. This is, to our knowledge, the first case where an arthroscopic approach was used to remove an ostochondroma of the distal third of the clavicle.

Effects of a Traditional versus an Alternative Strengthening Exercise Program on Shoulder Pain, Function and Physical Performance in Individuals with Subacromial Shoulder Pain: A Randomized Controlled Trial

A manual shoulder-training device may represent an alternative training device to improve symptoms and function in patients with subacromial shoulder pain by strengthening the external rotators. Thus, we examined the effects of a traditional versus an alternative strengthening exercise program on shoulder pain/function and physical performance in individuals with subacromial shoulder pain. Fifty-six adults with subacromial shoulder pain were randomly assigned to a passive control group (CON; n = 20), a traditional training group (TRA; n = 19), or an alternative training group (ALT; n = 17). Both training groups conducted a progressive home-based strengthening exercise program for the external rotators for eight weeks using elastic bands only (TRA group) or in combination with the shoulder-training device (Schulterhilfe®) (ALT group). Pre- and post-training assessment included measures of shoulder pain/function (i.e., shoulder pain and disability index (SPADI)) and physical performance (i.e., shoulder flexibility, maximal isometric strength, and strength endurance). We found significant test × group interactions in most of the investigated variables. Post hoc analyses showed significant training-related improvements for proxies of shoulder pain/function, shoulder flexibility, maximal isometric strength, and strength endurance in favor of the ALT and TRA group in comparison to the CON group. Further, larger and more frequent effects were found for the ALT compared to the TRA group. Measures of shoulder pain/function and physical performance can be significantly improved by both training regimens in individuals with subacromial shoulder pain. However, strength training using elastic bands with the manual shoulder device (ALT group) as compared to elastic bands (TRA group) only was more effective and may thus be a recommendable alternative in order to mitigate subacromial shoulder pain.

Scapula motor control training with Proprioceptive Neuromuscular Facilitation in chronic subacromial impingement syndrome: A case report

INTRODUCTION

Shoulder complaints have high re-occurrence rates and scapular control seems to be a major influencing factor in sub-acromial impingement syndromes (SIS). Scapular dyskinesia disrupts the scapulohumeral rhythm, altering biomechanical loads on the rotator cuff in shoulder movements. As a result, this disturbs the natural healing process. Proprioceptive Neuromuscular Facilitation (PNF) seems to be a promising treatment approach because it has a focus on motor learning. This case report seeks to illustrate the clinical reasoning and feasibility of applying the comprehensive nature of PNF in a patient who was not responsive to standard physiotherapy.

CASE DESCRIPTION

A 47-year-old male, a former professional handball player, was diagnosed with a SIS based upon a rotator-cuff tendinopathy, scapular dyskinesia and degeneration of supraspinatus tendon. The patient presented complaints of right sided shoulder pain in overhead activities and in reaching behind the back.

PATIENT MANAGEMENT

PNF-based motor-control training was provided over a period of five weeks. This approach included specified PNF-pattern exercises with specific PNF-facilitation principles and techniques. The results were improvements beyond the minimal clinical important difference and/or minimal detectable change for physical functioning, pain, range of motion, and functional disability of the shoulder.

DISCUSSION AND CONCLUSION

PNF provided an opportunity for motor control training, restored altered movement patterns in the patient's daily life activities. The approach addressed motor learning effects and structural impairments. PNF-patterns have been described as: "mimicking functional activities" from daily life and from sports. In cases where standard strengthening and mobilization exercises are not effective, a specified PNF-based therapy has shown to be a feasible alternative.

Shoulder MR Imaging Versus Ultrasound: How to Choose

Imaging evaluation of the shoulder is performed using multiple modalities, including ultrasound (US) and MR imaging. Clinicians often wonder which modality to use to work up their patients with shoulder pain. Although MR imaging has remained the workhorse of shoulder imaging, US has increased in popularity among academic and private institutions. Both modalities offer similar diagnostic information in regards to rotator cuff pathology and other soft tissues, although they differ in their technique, indications, and interpretation. A thorough understanding of these differences is imperative to appropriately use these modalities in clinical practice, including the unique interventional opportunities available with US.

Identification of Inflammatory Mediators in Tendinopathy Using a Murine Subacromial Impingement Model

Subacromial impingement is associated with a spectrum of disorders-including rotator cuff disease-but their relationship is complex. We have established a novel murine model of subacromial impingement to study supraspinatus tendinopathy. The purpose of this study was to evaluate changes in gene expression in this murine shoulder impingement model to further elucidate the mechanisms underlying the development of tendinopathy. Twenty-eight C57BL/6 mice were used in this study. All mice underwent bilateral surgery with insertion of a small metal clip in the subacromial space or a sham procedure. The supraspinatus tendons underwent histological analyses, biomechanical testing, and RNA extraction for multiplex gene expression analysis (NanoString, Seattle, WA). Histology demonstrated increased cellularity and disorganized collagen fibers of the supraspinatus tendon in the clip impingement group. Mean load to failure (5.20 vs. 1.50 N, p < 0.001) and mean stiffness (4.95 vs. 1.47 N/mm, p < 0.001) were lower in the impingement group than the sham group. NanoString analyses revealed 111 differentially expressed genes (DEGs) between the impingement and sham groups. DEGs of interest included Mmp3 (expression ratio [ER]: 2.68, p = 0.002), Tgfb1 (ER: 1.76, p = 0.01), Col3a1 (ER: 1.66, p = 0.03), and Tgfbr2 (ER: 1.53, p = 0.01). Statement of clinical significance: We identified 111 DEGs that may contribute to the development of tendinopathy in this model. Further studies of these specific genes will allow identification of their roles in the initiation and regulation of tendon damage, and their potential to serve as novel therapeutic targets in the treatment of rotator cuff disease. © 2019 Orthopaedic Research Society. Published by Wiley Periodicals, Inc. J Orthop Res 37:2575-2582, 2019.

MicroRNA-29a Mitigates Subacromial Bursa Fibrosis in Rotator Cuff Lesion with Shoulder Stiffness

Rotator cuff lesion with shoulder stiffness is a major cause of shoulder pain and motionlessness. Subacromial bursa fibrosis is a prominent pathological feature of the shoulder disorder. MicroRNA-29a (miR-29a) regulates fibrosis in various tissues; however, the miR-29a action to subacromial bursa fibrosis remains elusive. Here, we reveal that subacromial synovium in patients with rotator cuff tear with shoulder stiffness showed severe fibrosis, hypertrophy, and hyperangiogenesis histopathology along with significant increases in fibrotic matrices collagen (COL) 1A1, 3A1, and 4A1 and inflammatory cytokines, whereas miR-29a expression was downregulated. Supraspinatus and infraspinatus tenotomy-injured shoulders in transgenic mice overexpressing miR-29a showed mild swelling, vascularization, fibrosis, and regular gait profiles as compared to severe rotator cuff damage in wild-type mice. Treatment with miR-29a precursor compromised COL3A1 production and hypervascularization in injured shoulders. In vitro, gain of miR-29a function attenuated COL3A1 expression through binding to the 3’-untranslated region (3′-UTR) of COL3A1 in inflamed tenocytes, whereas silencing miR-29a increased the matrix expression. Taken together, miR-29a loss is correlated with subacromial bursa inflammation and fibrosis in rotator cuff tear with shoulder stiffness. miR-29a repressed subacromial bursa fibrosis through directly targeting COL3A1 mRNA, improving rotator cuff integrity and shoulder function. Collective analysis offers a new insight into the molecular mechanism underlying rotator cuff tear with shoulder stiffness. This study also highlights the remedial potential of miR-29a precursor for alleviating the shoulder disorder.

Ultrasound-Guided Standard vs Dual-Target Subacromial Corticosteroid Injections for Shoulder Impingement Syndrome: A Randomized Controlled Trial

OBJECTIVE

To compare dual-target injection with standard ultrasound (US)-guided subacromial injection in patients with subacromial impingement syndrome (SIS) and possible disorders of the biceps long-head tendons.

DESIGN

Double-blind, randomized controlled trial.

SETTING

Rehabilitation outpatient clinic.

PARTICIPANTS

Patients with SIS (N=60).

INTERVENTION

(1) US-guided standard subacromial bursa; (2) dual-target (subacromial bursa plus proximal biceps long-head tendon) injection, with 40-mg triamcinolone acetonide administered to patients in each group.

MAIN OUTCOME MEASURES

Clinical assessments were performed at baseline. The outcomes, including results from a self-administered questionnaire, the Shoulder Pain and Disability Index (SPADI), and a self-pain report, the visual analog scale (VAS) scores for pain at rest, at night, and during overhead activities, were evaluated at baseline and at the first and third months postintervention.

RESULTS

No significant difference was observed in baseline evaluations between groups (n=30 in each treatment arm) prior to injections. Both groups exhibited significant SPADI and VAS-score improvements after the first month. The dual-target injection group had less rebounding pain at the 3-month follow-up. The standard injection group had more patients reporting worsening pain within 1 day postinjection.

CONCLUSION

US-guided dual-target corticosteroid injection showed similar short-term efficacy to standard subacromial injections, but with an extended duration of symptom relief. Therefore, dual-target corticosteroid injections may be useful for shoulder pain treatment in patients with SIS.

Overuse Injuries of the Shoulder

This article discusses the most common and important overuse injuries of the shoulder with attention to MR imaging and ultrasound findings. Pathologic conditions occurring in athletes and nonathletes are included, with review of relevant anatomy, predisposing factors, and treatment considerations. Specific overuse injuries involving the rotator cuff, long head of the biceps tendon, and subacromial-subdeltoid bursa are reviewed. Impingement syndromes of the shoulder, Little Leaguer's shoulder, and stress-induced distal clavicular osteolysis are also discussed.

The Effects of Rigid Scapular Taping on the Subacromial Space in Athletes With and Without Rotator Cuff Tendinopathy: A Randomized Controlled Study

CONTEXT

Reduction of the subacromial space (SAS) during arm elevation may contribute to rotator cuff (RC) tendinopathy. The effects of scapular taping on the SAS in athletes with and without RC tendinopathy are unknown.

OBJECTIVE

To investigate the immediate effects of scapular taping on the SAS in athletes with and without RC tendinopathy.

DESIGN

Randomized controlled study with repeated measures.

SETTING

University laboratory.

PARTICIPANTS

A total of 43 male volleyball players (17 asymptomatic and 26 with RC tendinopathy, mean age = 22.9 [3.5] y) participated in the study.

INTERVENTION

Three scapular taping protocols-no taping (control), taping with tension (therapeutic taping), and taping without tension (sham taping).

MAIN OUTCOME MEASURES

Ultrasound measurements of the SAS with the arm at 0° and 60° of shoulder abduction, and the change in the SAS between 0° and 60° of shoulder abduction (SAS_0°-60°) were calculated.

RESULTS

Athletes with RC tendinopathy demonstrated larger SAS with therapeutic taping at 60° of shoulder abduction (6.9 [1.9] mm vs 5.8 [1.7] mm, mean difference = 1.1 mm, 95% confidence interval, -1.80 to -0.39, P = .002) when compared with the no taping condition. The tendinopathy group also showed less reduction in the SAS with therapeutic taping during SAS_0°-60° (2.0 [1.4] mm vs 2.8 [1.4] mm, P = .02) when compared with the no taping condition. When tape was applied to the scapula in asymptomatic athletes, our results showed a relatively small increase in the SAS with therapeutic taping during arm resting at 0° of abduction when compared with the no taping condition (8.7 [0.9] mm vs 8.3 [0.8] mm, mean difference = 0.4 mm, 95% confidence interval, -0.71 to -0.11, P = .01).

CONCLUSIONS

Athletes with RC tendinopathy demonstrated less reduction of the SAS with rigid scapular taping during early arm abduction. Such observation was not evidenced in asymptomatic athletes.

Effectiveness and safety of fluoroscopy-guided acupuncture for subacromial impingement syndrome: A protocol for a randomized, patient-assessor blind, parallel clinical trial

INTRODUCTION

Subacromial impingement syndrome (SIS) is one of the most common diseases inducing shoulder pain. Acupuncture is a source of pain relief that has been used for SIS; however, there is no clinical study about image-guided acupuncture for SIS. The aim of this study is to evaluate the effectiveness and safety of fluoroscopy-guided acupuncture in patients with SIS.

METHODS

This is the protocol for a randomized, patient-assessor blind, parallel clinical trial comparing fluoroscopy-guided acupuncture to acupuncture without fluoroscopy. There will be a 1-week run-in period before random allocation to 2 groups. The total duration of the clinical trial will be 3 weeks including 2 weeks for the follow-up period. A total of 57 participants will be enrolled for the clinical trial. Acupuncture will be conducted in 2 sessions for each group, once at baseline and once at the 1-week mark. The primary outcome will be 100 mm pain visual analogue scale. Secondary outcomes will include the Neer and Hawkins test, the Modified Constant Murley Score scale, the Shoulder Pain And Disability Index, the patient satisfaction degree, and the accuracy rate of acupuncture. For the evaluation of safety, adverse events will be monitored.

DISCUSSION

We designed the clinical trial using image-guided acupuncture. This will be the first trial to study the effectiveness of image-guided acupuncture for SIS compared with acupuncture using the proportional measurements.

TRIAL REGISTRATION

Clinical Research Information Service Registration Number is KCT0002751. Registered on March 23, 2018.

Subacromial lipoma causing shoulder impingement syndrome

Subacromial lipoma represents a rare cause of subacromial impingement syndrome (SIS). A 49-year-old male patient presented to clinic with progressive right shoulder pain and limited movement, ongoing for approximately 1 month. Magnetic resonance imaging (MRI) revealed a lesion, compatible with lipoma, extending through subacromial space and pressing on supraspinatus muscle. After histopathological verification of lipoma, mass was excised. Postoperatively, patient completed 1 month physical therapy and rehabilitation program. Patient was free of pain at 4-month follow-up. Subacromial lipoma should be included in differential diagnosis of SIS for patients unresponsive to conservative treatment; MRI is very useful to determine precise etiology and inform surgical treatment.

Injection Therapies for Rotator Cuff Disease

Rotator cuff disease affects a large proportion of the overall population and encompasses a wide spectrum of pathologies, including subacromial impingement, rotator cuff tendinopathy or tear, and calcific tendinitis. Various injection therapies have been used for the treatment of rotator cuff disease, including corticosteroid, prolotherapy, platelet-rich plasma, stem cells, and ultrasound-guided barbotage for calcific tendinitis. However, the existing evidence for these therapies remains controversial or sparse. Ultimately, improved understanding of the underlying structural and compositional deficiencies of the injured rotator cuff tissue is needed to identify the biological needs that can potentially be targeted with injection therapies.

Ultrasound elastography-based assessment of the elasticity of the supraspinatus muscle in impingement syndrome: does elastography has any diagnostic value?

Ultrasound elastography (UE) is a new ultrasound-based imaging technique that provides information about elasticity and stiffness of tissues. This cross-sectional study aimed to identify the diagnostic importance of UE in supraspinatus impingement syndrome. Forty-one subjects, aged 38-70 years, were included in the study. UE was used to determine the elasticity of the supraspinatus muscle. The strain ratio was calculated as the evaluation criteria to measure the elasticity of the muscle. High strain ratio indicated low elasticity. The measurements were made by the blinded radiologist while the patients sat with their shoulder in a neutral position. The diagnostic value of the strain ratio was evaluated using the receiver operating characteristic (ROC) analysis. The mean strain value of the supraspinatus muscle on the intact and pathological shoulders determined by UE was 0.74 ± 0.33 and 0.31 ± 0.24, respectively. A low strain ratio value in the supraspinatus muscle on the side with impingement syndrome was measured. When the test variable was evaluated as "strain ratio" according to ROC curve analysis, it was found to be above the reference line [0.849 (> 0.5)] (P = 0.00). When the cutoff value was selected as 0.495, the sensitivity and specificity were found to be 75.6 and 78% (the strain ratio value > 0.495), respectively. Measurement of strain ratio with UE can be used as a noninvasive, inexpensive, and practical diagnostic test for the shoulder impingement disease.

Growth factor delivery strategies for rotator cuff repair and regeneration

The high incidence of degenerative tears and prevalence of retears (20-95%) after surgical repair makes rotator cuff injuries a significant health problem. This high retear rate is attributed to the failure of the repaired tissue to regenerate the native tendon-to-bone insertion (enthesis). Biological augmentation of surgical repair such as autografts, allografts, and xenografts are confounded by donor site morbidity, immunogenicity, and disease transmission, respectively. In contrast, these risks may be alleviated via growth factor therapy, which can actively influence the healing environment to promote functional repair. Several challenges have to be overcome before growth factor delivery can translate into clinical practice such as the selection of optimal growth factor(s) or combination, identification of the most efficient stage and duration of delivery, and the design considerations for the delivery device. Emerging insight into the injury-repair microenvironment and our understanding of growth factor mechanisms in healing are informing the design of advanced delivery scaffolds to effectively treat rotator cuff tears. Here, we review potential growth factor candidates, design parameters and material selection for growth factor delivery, innovative and dynamic delivery scaffolds, and novel therapeutic targets from tendon and developmental biology for the structural and functional healing of rotator cuff repair.

Brunner U. Impingement Syndrome of the Shoulder

BACKGROUND

Shoulder pain is the third most common musculoskeletal complaint in orthopedic practice. It is usually due to a defect of the rotator cuff and/or an impingement syndrome.

METHODS

This review is based on pertinent literature retrieved by a selective search of the Medline database.

RESULTS

Patients with shoulder impingement syndrome suffer from painful entrapment of soft tissue whenever they elevate the arm. The pathological mechanism is a structural narrowing in the subacromial space. A multiplicity of potential etiologies makes the diagnosis more difficult; it is established by the history and physical examination and can be confirmed with x-ray, ultra - sonography, and magnetic resonance imaging. The initial treatment is conservative, e.g., with nonsteroidal antiinflammatory drugs, infiltrations, and patient exercises. Conservative treatment yields satisfactory results within 2 years in 60% of cases. If symptoms persist, decompressive surgery is performed as long as the continuity of the rotator cuff is preserved and there is a pathological abnormality of the bursa. The correct etiologic diagnosis and choice of treatment are essential for a good outcome. The formal evidence level regarding the best treatment strategy is low, and it has not yet been determined whether surgical or conservative treatment is better.

CONCLUSION

Randomized controlled therapeutic trials are needed so that a standardized treatment regimen can be established.

Arthroscopic decompression not recommended in the treatment of rotator cuff tendinopathy

Aims

Rotator cuff tendinopathy has a multifactorial origin. Rejecting the mechanistic theory has also led to abandoning operative treatment at initial presentation in the first line. Physiotherapy exercise programmes are the accepted first line treatment. The aim of this study was to assess the long-term additional benefits of subacromial decompression in the treatment of rotator cuff tendinopathy.

Patients and Methods

This randomised controlled trial of 140 patients (52 men, 88 women, mean age 47.1 years; 18 to 60) with rotator cuff tendinopathy extended previous work up to a maximum of 13 years. The patients were randomised into two treatment groups: arthroscopic acromioplasty and a supervised exercise treatment and a similar supervised exercise treatment alone. Self-reported pain on a visual analogue scale (VAS) was the primary outcome measure. Secondary measures were disability, working ability, pain at night, Shoulder Disability Questionnaire score and the number of painful days during the three months preceding the final assessment.

Results

A total of 90 patients (64%) returned questionnaires at a mean 12 years after randomisation. On an intention-to-treat basis, both treatment groups reached statistically significant improvement compared with the initial VAS for pain, but there was no significant difference between groups. The same was true in the secondary outcome measures. Due to group changes, the results were also analysed per protocol: operated or not. No significant differences between the groups were found.

Conclusion

The natural history of rotator cuff tendinopathy probably plays a significant role in the results in the long-term. Even though the patients who underwent operative treatment had a stronger belief in recovery, which is likely to be surgical and the effect of placebo, the exercise group obtained similar results. In the future, an optimum exercise regime should be searched for, as the most clinically and cost-effective conservative treatment for rotator cuff tendinopathy. Cite this article: Bone Joint J 2017;99-B:799–805.

The diagnostic value of a modified Neer test in identifying subacromial impingement syndrome

BACKGROUND

Subacromial impingement syndrome (SAIS) is characterized by pain experienced through an arc of elevation as the shoulder abducts and diagnosed commonly by Neer test (NT). However, the diagnostic accuracy of NT for SAIS is still limited. Here, a modified Neer test (MNT) was introduced to improve the accuracy of the clinical examination in diagnosing SAIS and differentiating it from frozen shoulder. The aim of this study was to investigate the diagnostic values of MNT in diagnosing SAIS and differentiating it from frozen shoulder.

METHODS

Between January 2015 and June 2015, a prospective study assessed 85 shoulders among 82 patients with shoulder joint disease; 42 patients underwent arthroscopic surgery, and all 82 patients received X-rays, magnetic resonance imaging (MRI) or MRI contrast examinations. The diagnostic criteria are based on arthroscopy and MRI scanning.

RESULTS

Using clinical epidemiology and diagnostic tests, we calculated the sensitivity, specificity, positive predictive value, negative predictive value and degree of accuracy of MNT in diagnosing SAIS. The diagnostic accuracy rate of MNT in identifying shoulder SAIS was 90.59%, and the specificity was 95.56%.

CONCLUSIONS

In the diagnosis of SAIS, MNT is a reliable and highly accurate maneuver and seems useful to distinguish this syndrome from frozen shoulder.

Current Concepts in the Diagnosis and Treatment of Shoulder Impingement

Subacromial impingement syndrome (SIS) is a very common cause of shoulder pain in the young adults. It can cause debilitating pain, dysfunction, and affects the activities of daily living. It represents a spectrum of pathology ranging from bursitis to rotator cuff tendinopathy which can ultimately lead to degenerative tear of the rotator cuff. Various theories and concepts have been described and it is still a matter of debate. However, most published studies suggest that both extrinsic and intrinsic factors have a role in the development of SIS. The management is controversial as both nonoperative and operative treatments have shown to provide good results. This article aims to provide a comprehensive current concepts review of the pathogenesis, etiologies, clinical diagnosis, appropriate use of investigations, and discussion on the management of SIS.

Shoulder impingement syndrome: a systematic review of clinical trial participant selection criteria

BACKGROUND

Shoulder impingement syndrome (SIS) is a common diagnosis for patients with pain and dysfunction of the shoulder. Variations in the signs and symptoms might lead to uncertainty regarding the definition of SIS. The aim of this review is to explore the participant selection criteria used in the literature when investigating SIS and to assess differences in criteria among treating professions.

METHODS

This is a PRISMA systematic review of publications from 2009 to 2014 from MEDLINE, PubMed, The Cochrane Library, Embase, Scopus and CINAHL.

RESULTS

Ninety-seven articles met inclusion criteria for this review. Twenty-five different surgical and nonsurgical treatments were investigated. Impingement-specific index tests were used in all studies. Exclusion index tests were used in 62% of studies. Twenty index tests were identified. Radiological investigations were reported in 53% of all studies, of which a further 53% reported using two or more radiological investigations.

CONCLUSIONS

This systematic review has illustrated that studies investigating SIS test for various signs and symptoms, which is in keeping with describing the condition as a 'syndrome'. However, there are inconsistencies in participant selection criteria between health disciplines, highlighting a need for harmonization of the selection criteria in the form of an international editorial consensus.

Return to Sports After Arthroscopic Treatment of Rotator Cuff Calcifications in Athletes

BACKGROUND

Arthroscopic treatment of calcific deposits of rotator cuff tears has been described with successful results in the general population. However, despite the high frequency of this condition, there is no information in the literature regarding arthroscopic treatment of rotator cuff calcifications in athletes.

PURPOSE

To analyze the time to return to sport, clinical outcomes, and complications of complete arthroscopic removal of intratendinous calcific deposits and repair of the tendon lesion without acromioplasty in athletes.

STUDY DESIGN

Case series; Level of evidence, 4.

METHODS

This study retrospectively evaluated 24 consecutive patients with a mean age of 36.2 years. The mean follow-up was 59 months (range, 24-108 months). Patients completed a questionnaire focused on the time to return to sport and treatment course. Pre- and postoperative functional assessment was performed using the Constant score and University of California Los Angeles (UCLA) score. Pain was assessed by visual analog scale (VAS). Radiographs and magnetic resonance imaging (MRI) were performed to evaluate the recurrence of calcifications and the indemnity of the supraspinatus tendon repair.

RESULTS

Of the 24 patients, 23 (95.8%) were able to return to sports; 91.3% returned to the same level. The mean time to return to play was 5.3 months (range, 3-9 months): 26% of patients (6/23) returned to sports in less than 4 months, 61% (14/24) returned between 4 and 6 months, and 13% (3/24) returned after the sixth month. The mean Constant score increased from 26.9 preoperatively to 89.7 postoperatively (P < .001), and the UCLA score increased from 17.3 preoperatively to 33.2 postoperatively (P < .001). Significant improvement was obtained for pain (mean VAS, 8.4 [before surgery] vs 0.6 [after]; P < .001). The overall majority (91.6%) of patients were satisfied with their result. MRI examination at last follow-up (79% of patients) showed no tendon tears.

CONCLUSION

In athletes with calcifying tendinitis of the supraspinatus tendon with failed nonoperative treatment, complete arthroscopic removal of calcific deposits and tendon repair without acromioplasty results in significant pain relief and improvement in functional outcomes. Most patients return to the same level of proficiency regardless of the type of sport and the level of competition before injury, with 91.6% of patients satisfied with their results.

Effect of corticosteroid injections versus physiotherapy on pain, shoulder range of motion and shoulder function in patients with subacromial impingement syndrome: A systematic review and meta-analysis

Background

Subacromial impingement syndrome (SIS) is one of the most common causes of shoulder pain. Limited research has been conducted into the efficacy of corticosteroid injections (CSIs) compared to physiotherapy in the management of SIS.

Objective

To critically appraise and establish the best available evidence for the effectiveness of CSI in comparison with physiotherapy for the management of pain, shoulder range of motion (ROM) and shoulder function in patients with SIS.

Methodology

Seven databases were searched from inception to February 2016, namely PubMed, Science Direct, EBSCO Host: SPORTDiscus, EBSCO Host: CINAHL, Cochrane, Scopus and PEDro. The main search terms were shoulder impingement syndrome and/or subacromial impingement syndrome, corticosteroid injections and/or steroid injections, physical therapy and/or physiotherapy. Only randomised controlled trials (RCTs) were considered for inclusion. The articles were appraised according to the PEDro scale. The Revman^© Review Manager Software was used to combine the results of shoulder function and the data were illustrated in forest plots.

Results

The PEDro scores of the three RCTs that qualified for this review ranged from 7 to 8/10. There is Level II evidence suggesting that besides a significant improvement in shoulder function in favour of CSI at 6–7 weeks follow-up (p < 0.0001), no evidence was found for the superiority of CSIs compared with physiotherapy for pain, ROM and shoulder function in the short- (1–3 months), mid- (6 months) and long term (12 months).

Conclusion

In patients with SIS only a short term significant improvement in shoulder function was found in favour of CSIs.

Efficacy of exercise therapy in workers with rotator cuff tendinopathy: a systematic review

Objective:

To perform a systematic review of randomized controlled trials (RCTs) on the efficacy of therapeutic exercises for workers suffering from rotator cuff (RC) tendinopathy.

Methods:

A literature search in four bibliographical databases (Pubmed, CINAHL, EMBASE, and PEDro) was conducted from inception up to February 2015. RCTs were included if participants were workers suffering from RC tendinopathy, the outcome measures included work-related outcomes, and at least one of the interventions under study included exercises. The methodological quality of the studies was evaluated with the Cochrane Risk of Bias Assessment tool.

Results:

The mean methodological score of the ten included studies was 54.4%±17.2%. Types of workers included were often not defined, and work-related outcome measures were heterogeneous and often not validated. Three RCTs of moderate methodological quality concluded that exercises were superior to a placebo or no intervention in terms of function and return-to-work outcomes. No significant difference was found between surgery and exercises based on the results of two studies of low to moderate methodological quality. One study of low methodological quality, comparing a workplace-based exercise program focusing on the participants' work demands to an exercise program delivered in a clinical setting, concluded that the work-based intervention was superior in terms of function and return-to-work outcomes.

Conclusion:

There is low to moderate-grade evidence that therapeutic exercises provided in a clinical setting are an effective modality to treat workers suffering from RC tendinopathy and to promote return-to-work. Further high quality studies comparing different rehabilitation programs including exercises in different settings with defined workers populations are needed to draw firm conclusions on the optimal program to treat workers.