Supraspinatus tendon and subacromial space parameters measured on ultrasonographic imaging in subacromial impingement syndrome.

PURPOSE: To characterize the supraspinatus tendon thickness, subacromial space, and the relationship between tendon thickness and subacromial space to further elucidate the mechanisms of subacromial impingement syndrome. METHODS: In a single-blind cross-sectional study, subjects were recruited with subacromial impingement syndrome (n = 20) and asymptomatic controls (n = 20) matched for age, gender, and hand dominance. Ultrasound images were collected using a 4-12-MHz linear transducer in B-mode of the supraspinatus tendon in the transverse (short axis) and the anterior aspect of the subacromial space outlet. Using image callipers, measurements of tendon thickness were taken at 3 points along the tendon and averaged for a single thickness measure. The subacromial space outlet was measured via the acromiohumeral distance (AHD) defined by the inferior acromion and superior humeral head. The occupation ratio was calculated as the tendon thickness as a percentage of AHD. RESULTS: The subacromial impingement syndrome group had a significantly thicker tendon (mean difference = 0.6 mm, p = 0.048) and a greater tendon occupation ratio (mean difference = 7.5 %, p = 0.014) compared to matched controls. There were no AHD group differences. CONCLUSIONS: The supraspinatus tendon was thicker and occupied a greater percentage of AHD, supporting an intrinsic mechanism. An extrinsic mechanism of tendon compression is theoretically supported, but future imaging studies need to confirm direct compression with elevation. Treatment to reduce tendon thickness may reduce symptoms, and surgical intervention to increase subacromial space may be considered if tendon compression can be verified.

Neovascularization prevalence in the supraspinatus of patients with rotator cuff tendinopathy.

OBJECTIVE: A high prevalence of neovascularity in lower extremity tendinopathies has been reported. Neovascularity in those with rotator cuff tendinopathy exclusively has not been examined. The objective was to determine the prevalence of neovascularization in patients with rotator cuff tendinopathy compared with asymptomatic controls. DESIGN: Single-blind cross-sectional study. SETTING: Research laboratory. PARTICIPANTS: Participants (n = 40; age = 44.9 years, 23-62 years; 20 females) with rotator cuff tendinopathy (n = 20) but without full-thickness rotator cuff tears, and asymptomatic controls that were age, gender, and hand dominance matched (n = 20) to the patients. INTERVENTIONS: The participants laying in supine had their shoulder positioned in internal rotation and extension. Ultrasound images were collected of the supraspinatus tendon and subacromial bursae in the transverse and longitudinal planes using a linear transducer in color Doppler mode. MAIN OUTCOME MEASURES: Images were assessed for neovascularization by 2 trained raters who were blinded to group (rotator cuff tendinopathy or asymptomatic group). RESULTS: No statistically significant difference in neovascularization was identified between participants with and without rotator cuff tendinopathy (χ = 0.13, df = 1, P = 0.72). Neovascularization was identified in 6 of 20 patients with rotator cuff tendinopathy (30%) and 5 of 20 asymptomatic control participants (25%). CONCLUSIONS: The authors found no differences in neovascularization rate in patients with rotator cuff tendinopathy (30%) and asymptomatic controls (25%). The study indicates that neovascularization is not related to presence of symptomatic tendinopathy in those with rotator cuff tendinopathy. Neovascularization may not be a relevant sonographic finding to aid the clinical assessment of those with rotator cuff tendinopathy.

Reliability and diagnostic accuracy of 5 physical examination tests and combination of tests for subacromial impingement.

OBJECTIVE: To investigate the reliability and diagnostic accuracy of individual tests and combination of tests for subacromial impingement syndrome (SAIS). DESIGN: A prospective, blinded study design. SETTING: Orthopedic surgeon shoulder clinic. PARTICIPANTS: Patients with shoulder pain (n=55, mean age=40.6y). INTERVENTIONS: Patients were evaluated with 5 physical examination tests for SAIS: Neer, Hawkins-Kennedy, painful arc, empty can (Jobe), and external rotation resistance tests. Surgical diagnosis was the reference standard. MAIN OUTCOME MEASURES: Diagnostic accuracy calculated with a receiver operating characteristic (ROC) curve and sensitivity, specificity, positive likelihood ratio (+LR), and negative likelihood ratio (-LR). A forward stepwise binary logistic regression analysis was used to determine the best test combination for SAIS. An ROC curve analysis was also used to determine the cut point of the number of tests discriminating between the presence and absence of SAIS. Kappa coefficients and percent agreement assessed interrater reliability. RESULTS: The ROC analyses revealed a significant area under the curve (AUC) (AUC=.67-.72, P<.05) for all tests, except for the Hawkins-Kennedy. The tests with a +LR greater than or equal to 2.0 were the painful arc (+LR=2.25; 95% CI, 1.33-3.81), empty can (+LR=3.90; 95% CI, 1.5-10.12), and the external rotation resistance tests (+LR=4.39; 95% CI, 1.74-11.07). Tests with -LR less than or equal to 0.50 were the painful arc (-LR=.38; 95% CI, .16-.90), external rotation resistance (-LR=.50; 95% CI, .28-.89), and Neer tests (-LR=.35; 95% CI, .12-.97). The regression analysis had no specific test combinations for confirming or ruling out SAIS. The ROC analysis was significant (AUC=.79, P=.001), with a cut point of 3 positive tests out of 5 tests. Reliability was moderate to substantial agreement (kappa=.45-.67) for the painful arc, empty can, and external rotation resistance tests and fair strength of agreement (kappa=.39-.40) for the Neer and Hawkins-Kennedy tests. CONCLUSIONS: The single tests of painful arc, external rotation resistance, and Neer are useful screening tests to rule out SAIS. The single tests of painful arc, external rotation resistance, and empty can are helpful to confirm SAIS. The reliability of all tests was acceptable for clinical use. Based on reliability and diagnostic accuracy, the single tests of the painful arc, external rotation resistance, and empty can have the best overall clinical utility. The cut point of 3 or more positive of 5 tests can confirm the diagnosis of SAIS, while less than 3 positive of 5 rules out SAIS.

Descriptive analysis of patients undergoing shoulder surgery at a tertiary care military medical center.

Shoulder pain is a common musculoskeletal complaint. Patients with shoulder pain who are seeking care in a military tertiary setting in the United States have not been previously described. This study describes the clinical features of 55 patients (47 men, 8 women) undergoing shoulder surgery at a tertiary care military medical center. Patients presenting to a military medical center are different than other previously described samples in the literature. Specifically, the patients in this study had a known mechanism of injury (n = 42; 76%), multiple structures involved (n = 46; 84%) and a high prevalence of glenoid labral involvement (n = 44; 80%). Further research is needed to determine if these patient characteristics identified in this study warrant different management strategies and resource utilization in both the tertiary care center, and in the primary care center where these patients are typically seen before referral to a tertiary care center.

Avoiding peripheral nerve injury in arterial interventions.

Although peripheral nerve injuries secondary to angiography and endovascular interventions are uncommon and usually not permanent, they can result in significant functional impairment. Most arteries used in access for angiography and endovascular therapies lie in close proximity to a nerve. The nerve may be injured by needle puncture, or by compression from hematoma, pseudoaneurysm, hemostasis devices, or by manual compression with incidence in literature ranging from as low as 0.04% for femoral access in a large retrospective study to 9% for brachial and axillary access. Given the increasing frequency of endovascular arterial procedures and the increasing use of nontraditional access points, it is important that the interventionalist have a working knowledge of peripheral nerve anatomy and function as it relates to relevant arterial access sites to avoid injury.

Centers for Medicare and Medicaid Services Policy Regarding Supervised Exercise for Patients With Intermittent Claudication: The Good, the Bad, and the Ugly.

On May 25, 2017, the Centers for Medicare and Medicaid Services (CMS) issued a decision memo establishing coverage for supervised exercise therapy (SET) for Medicare beneficiaries experiencing intermittent claudication due to peripheral artery disease (PAD). A meaningful impact on population health is possible with greater freedom to participate in regular physical activity. The authors of this editorial explain the potential roles of physical therapists in the SET program and argue for further integration of physical therapists through collaborative practice. J Orthop Sports Phys Ther 2017;47(12):892-894. doi:10.2519/jospt.2017.0111.

Peripheral Artery Disease: What You Need to Know.

Synopsis Claudication from peripheral artery disease (PAD) may mimic or coexist with musculoskeletal conditions and represents an important diagnostic consideration in patients over 50 years of age. Physical therapists are optimally positioned to recognize this condition by incorporating a vascular history and physical examination in appropriately selected patients. Recognition of PAD is important both from the standpoint of addressing the ischemic risk to the limb and because PAD is associated with high cerebrovascular and cardiovascular risk. Therefore, multidisciplinary management of patients with PAD is essential. Extensive evidence supports treatment of PAD-related claudication with supervised exercise, and physical therapists are well positioned to play an important role in this treatment. J Orthop Sports Phys Ther 2017;47(12):957-964. Epub 9 Oct 2017. doi:10.2519/jospt.2017.7442.

Aberrant systemic arterial supply to normal lung arising from the proper hepatic artery discovered during transarterial chemoembolization.

We report a rare case of dual arterial supply to an otherwise normal lung discovered incidentally during initial angiography performed with the intent of chemoembolization of hepatocellular carcinoma. In addition to normal hepatic arterial supply, the proper hepatic artery provided systemic arterial supply to the lower lobe of the left lung. Subsequent chest computed tomography angiography demonstrated a normal tracheobronchial tree and normal pulmonary arterial supply to the lung. Although other anatomic variants have been reported, there are no other reported cases of systemic arterial supply from the proper hepatic artery to the lung. Identifying systemic arterial supply to the lung during angiography is important while performing transcatheter chemoembolization or radioembolization in the liver in order to minimize non-target embolization of the lung.

Diagnosing suprascapular neuropathy in patients with shoulder dysfunction: a report of 5 cases.

BACKGROUND AND PURPOSE: Suprascapular neuropathy, resulting in shoulder pain and weakness, is frequently misdiagnosed. The consequences of misdiagnosis can include inappropriate physical rehabilitation or surgical procedures. The purpose of this case report is to describe the differential diagnosis of suprascapular neuropathy. CASE DESCRIPTIONS: Five patients were initially diagnosed with subacromial impingement syndrome and referred for physical therapy. Physical therapist examination findings were consistent with subacromial impingement syndrome and suprascapular neuropathy. Subsequent electrophysiologic testing confirmed the diagnosis of suprascapular neuropathy in all 5 patients. DISCUSSION: The differential diagnosis of patients with suprascapular neuropathy includes subacromial impingement syndrome, rotator cuff pathology, C5-6 radiculopathy, and upper trunk brachial plexopathy. The diagnostic process and a table with key findings based on evidence and clinical experience is presented for differential diagnosis.

The scapular assistance test results in changes in scapular position and subacromial space but not rotator cuff strength in subacromial impingement.

STUDY DESIGN: Controlled laboratory study. OBJECTIVES: To determine the effect of the modified scapular assistance test (SAT) on 3-dimensional shoulder kinematics, strength, and linear measures of subacromial space in patients with subacromial impingement syndrome (SAIS). BACKGROUND: Abnormal scapular kinematics have been identified in patients with SAIS. Increased scapular upward rotation and posterior tilt, as induced with manual assistance using the SAT, have been theorized to increase subacromial space and may alter shoulder strength. METHODS: Forty-two subjects (21 with SAIS and 21 controls) participated in this study. The anterior outlet of the subacromial space, measured via the acromiohumeral distance on ultrasound images, and 3-dimensional scapular kinematics, measured using motion analysis, were determined with the arm at rest, and at 45° and 90° of active elevation with and without the SAT. A dynamometer was used to measure isometric shoulder strength. Full factorial mixed-model analyses of variance evaluated the effects of the SAT on variables between groups. RESULTS: There was an increase in scapular posterior tilt at all angles, upward rotation at rest and 45° of elevation, and acromiohumeral distance at 45° and at 90° with the SAT. The SAT did not alter normalized isometric strength. There were no differences in response to the SAT between the SAIS and control groups. CONCLUSIONS: Manual scapular assistance using the SAT influences factors associated with SAIS, such as subacromial space and potentially scapular orientation during static arm elevation, but not more so in individuals with SAIS than in healthy individuals. The SAT performed statically may be a way to identify potential subgroups of individuals with SAIS for whom subacromial space narrowing may be a contributing factor.

Diagnostic accuracy of history and physical examination of superior labrum anterior- posterior lesions.

CONTEXT: Type I superior labrum anterior-posterior (SLAP) lesions involve degenerative fraying and probably are not the cause of shoulder pain. Type II to IV SLAP lesions are tears of the labrum. OBJECTIVE: To determine the diagnostic accuracy of patient history and the active compression, anterior slide, and crank tests for type I and type II to IV SLAP lesions. DESIGN: Cohort study. SETTING: Clinic. PATIENTS OR OTHER PARTICIPANTS: Fifty-five patients (47 men, 8 women; age = 40.6 ± 15.1 years) presenting with shoulder pain. INTERVENTION(S): For each patient, an orthopaedic surgeon conducted a clinical examination of history of trauma; sudden onset of symptoms; history of popping, clicking, or catching; age; and active compression, crank, and anterior slide tests. The reference standard was the intraoperative diagnosis. The operating surgeon was blinded to the results of the clinical examination. MAIN OUTCOME MEASURE(S): Diagnostic utility was calculated using the receiver operating characteristic curve and area under the curve (AUC), sensitivity, specificity, positive likelihood ratio (+LR), and negative likelihood ratio (-LR). Forward stepwise binary regression was used to determine a combination of tests for diagnosis. RESULTS: No history item or physical examination test had diagnostic accuracy for type I SLAP lesions (n = 13). The anterior slide test had utility (AUC = 0.70, +LR = 2.25, -LR = 0.44) to confirm and exclude type II to IV SLAP lesions (n = 10). The combination of a history of popping, clicking, or catching and the anterior slide test demonstrated diagnostic utility for confirming type II to IV SLAP lesions (+LR = 6.00). CONCLUSIONS: The anterior slide test had limited diagnostic utility for confirming and excluding type II to IV SLAP lesions; diagnostic values indicated only small shifts in probability. However, the combination of the anterior slide test with a history of popping, clicking, or catching had moderate diagnostic utility for confirming type II to IV SLAP lesions. No single item or combination of history items and physical examination tests had diagnostic utility for type I SLAP lesions.

Reliability and diagnostic accuracy of history and physical examination for diagnosing glenoid labral tears.

BACKGROUND: Glenoid labral tears provide a diagnostic challenge. HYPOTHESIS: Combinations of items in the patient history and physical examination will provide stronger diagnostic accuracy to suggest the presence or absence of glenoid labral tear than will individual items. STUDY DESIGN: Cohort study (diagnosis); Level of evidence, 1. METHODS: History and examination findings in patients with shoulder pain (N = 55) were compared with arthroscopic findings to determine diagnostic accuracy and intertester reliability. RESULTS: The intertester reliability of the crank, anterior slide, and active compression tests was 0.20 to 0.24. A combined history of popping or catching and positive crank or anterior slide results yielded specificities of 0.91 and 1.00 and positive likelihood ratios of 3.0 and infinity, respectively. A positive anterior slide result combined with either a positive active compression or crank result yielded specificities of 0.91 and positive likelihood ratio of 2.75 and 3.75, respectively. Requiring only a single positive finding in the combination of popping or catching and the anterior slide or crank yielded sensitivities of 0.82 and 0.89 and negative likelihood ratios of 0.31 and 0.33, respectively. CONCLUSION: The diagnostic accuracy of individual tests in previous studies is quite variable, which may be explained in part by the modest reliability of these tests. The combination of popping or catching with a positive crank or anterior slide result or a positive anterior slide result with a positive active compression or crank test result suggests the presence of a labral tear. The combined absence of popping or catching and a negative anterior slide or crank result suggests the absence of a labral tear.

Effectiveness of rehabilitation for patients with subacromial impingement syndrome: a systematic review.

Prior systematic reviews of rehabilitation for nondescript shoulder pain have not yielded clinically applicable results for those patients with subacromial impingement syndrome (SAIS). The purpose of this study was to examine the evidence for rehabilitation interventions for SAIS. The authors used data source as the method. The computerized bibliographic databases of Medline, the Cumulative Index to Nursing and Allied Health Literature (CINAHL), and the Cochrane Database of Systematic Reviews were searched from 1966 up to and including October 2003. Key words used were "shoulder," "shoulder impingement syndrome," "bursitis," and "rotator cuff" combined with "rehabilitation," "physical therapy," "electrotherapy," "ultrasound," "acupuncture," and "exercise," limited to clinical trials. Randomized clinical trials that investigated physical interventions used in the rehabilitation of patients with SAIS with clinically relevant outcome measures of pain and quality of life were selected. The search resulted in 635 potential studies, 12 meeting inclusion criteria. Two independent reviewers graded all 12 trials with a quality checklist averaged for a final quality score. The mean quality score for 12 trials was 37.6 out of a possible 69 points. Various treatments were evaluated: exercise in six trials, joint mobilizations in two trials, laser in three trials, ultrasound in two trials, and acupuncture in two trials. The limited evidence currently available suggests that exercise and joint mobilizations are efficacious for patients with SAIS. Laser therapy appears to be of benefit only when used in isolation, not in combination with therapeutic exercise. Ultrasound is of no benefit, and acupuncture trials present equivocal evidence. The low to mediocre methodologic quality, small sample sizes, and general lack of long-term follow-up limit these findings for the development of useful clinical practice guidelines. Further trials are needed to investigate these rehabilitation interventions, the superiority of one intervention over another, and the long-term outcomes of rehabilitation. Moreover, it is imperative that clinical guidelines are developed to indicate those patients who are likely to respond to rehabilitation.