The Frequency of Musculoskeletal Disorders and Nerve Entrapment Syndromes Around the Shoulder in a Cohort of Egyptian Patients

Background: Shoulder pain is a common musculoskeletal (MSK) disorder. However, proper diagnosis of shoulder dysfunction and causes of pain remains challenging. Objective: The objective of this study is to identify the frequency of musculoskeletal and neurological disorders among a cohort of Egyptian patients with chronic shoulder pain. Methods: A cross-sectional study was conducted on 120 patients with chronic shoulder pain. Clinical, imaging, and electrophysiology studies were conducted on each participant to assess the frequency of musculoskeletal and neurological causes of shoulder pain. Results: The commonest causes of shoulder pain in the present study were musculoskeletal disorders, representing 94.2% of the whole cases, of which rotator cuff pathology was the commonest in 78.3%. Neurological disorders were found in 45.8%, of which suprascapular neuropathy was the commonest in 31.7%. At the same time, combined musculoskeletal and neurological disorders were found in 59.2% of cases. The frequency of musculoskeletal disorders was significantly associated with the duration of shoulder pain, as well as patients' occupation, specifically manual working. While the frequency of neurological disorders was significantly associated with shoulder pain duration, old age, sex, and patient's occupation (mainly manual working). Conclusion: Musculoskeletal disorders are the most common causes of chronic shoulder pain, especially rotator cuff disorders. While suprascapular neuropathy is the most common neurological cause of chronic shoulder pain. The combination of musculoskeletal and neurological disorders together is also an important cause of shoulder pain in many cases, which may not be obvious and must be detected early to provide early and appropriate therapeutic intervention. Manual work is a risk factor for developing MSK and neuropathic shoulder disease.