This case series examined 150 patients referred for "frozen shoulder" and manipulation. After workup, only 37 had true primary frozen shoulder and underwent arthroscopy before manipulation under anesthesia. The study describes the arthroscopic appearance and questions the classic adhesive/capsular pathology.
The most practical lesson here is a diagnostic one. When a patient is labeled "frozen shoulder," assume it may be secondary until proven otherwise. Three out of four referred patients in this series had another cause of pain and stiffness, most often rotator cuff pathology or impingement. Be especially skeptical in younger patients with severe pain.
At arthroscopy, the expected findings are patchy synovitis around the biceps and subscapularis bursa with a contracted, low-volume joint, not dense intraarticular adhesions. Recognizing this pattern during a routine scope should raise frozen shoulder when the clinical picture was subtle.
The author reframes the pathology toward the subscapularis bursa restricting external rotation rather than capsular adhesion. This is a historical hypothesis, and modern understanding centers on capsular and coracohumeral contracture, so treat the mechanism as debated rather than settled.
Clinically, manipulation under anesthesia combined with irrigation and local anesthetic gave striking pain relief with no complications, though recovery timelines still followed the natural history.
This case series examined 150 patients referred for "frozen shoulder" and manipulation. After workup, only 37 had true primary frozen shoulder and underwent arthroscopy before manipulation under anesthesia. The study describes the arthroscopic appearance and questions the classic adhesive/capsular pathology.
The most practical lesson here is a diagnostic one. When a patient is labeled "frozen shoulder," assume it may be secondary until proven otherwise. Three out of four referred patients in this series had another cause of pain and stiffness, most often rotator cuff pathology or impingement. Be especially skeptical in younger patients with severe pain.
At arthroscopy, the expected findings are patchy synovitis around the biceps and subscapularis bursa with a contracted, low-volume joint, not dense intraarticular adhesions. Recognizing this pattern during a routine scope should raise frozen shoulder when the clinical picture was subtle.
The author reframes the pathology toward the subscapularis bursa restricting external rotation rather than capsular adhesion. This is a historical hypothesis, and modern understanding centers on capsular and coracohumeral contracture, so treat the mechanism as debated rather than settled.
Clinically, manipulation under anesthesia combined with irrigation and local anesthetic gave striking pain relief with no complications, though recovery timelines still followed the natural history.