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Anatomic relationships in the shoulder impingement syndrome
1Orthopaedic Research of Virginia, Richmond.
Clinical Orthopaedics and Related Research
|September 1, 1993
Summary
Shoulder impingement syndrome involves subacromial structure compression. This study identifies specific coracoacromial arch sites causing impingement during shoulder motion, aiding diagnosis and treatment.
Area of Science:
- Orthopedics
- Anatomy
- Sports Medicine
Background:
- Shoulder impingement syndrome results from subacromial structure compression.
- The coracoacromial arch, including the acromion and coracoacromial ligament, is implicated in impingement.
Purpose of the Study:
- To identify specific anatomic sites on the coracoacromial arch causing subacromial structure compression during shoulder motion.
- To correlate these findings with impingement pain during specific shoulder movements.
Main Methods:
- Examination of anatomic shoulder specimens.
- Demonstration of tendon and bone relationships with the coracoacromial arch during simulated shoulder motion.
Main Results:
- Biceps tendon impingement primarily occurs at the coracoacromial ligament's lateral edge.
- Supraspinatus tendon and greater tuberosity impingement occur against the acromion and coracoacromial ligament during flexion and internal rotation.
- The coracoacromial ligament stretches over the greater tuberosity, potentially leading to osteophyte formation.
Conclusions:
- Specific anatomic locations on the coracoacromial arch are responsible for impingement during shoulder motion.
- Understanding these sites can explain pain mechanisms and the development of chronic impingement symptoms, including osteophyte formation.