Neer's early description of degenerative disease of the proximal humeral articular surface. He separates primary osteoarthritis from secondary lesions (trauma, rheumatoid, metabolic, avascular necrosis) and outlines diagnosis and treatment. The paper reports one of the first series of vitallium humeral head replacements.
The central decision rule here is that glenohumeral incongruity is a diagnosis of exclusion. Neer's cadaver data show degenerative change in 28% of shoulders that likely functioned normally, so radiographic joint-space narrowing alone does not explain a patient's pain. Before blaming the joint surface, rule out the cuff, bursa, AC joint, cervical spine, infection, and neurotrophic causes.
The biomechanical mental model is the fulcrum: the humeral head lets the deltoid and cuff generate abduction. Excise the head and you lose the fulcrum, which is why resection failed and why replacement, which restores contour, succeeded.
Management sequence to remember: minimum 3 months of nonoperative care, operate only for intolerable pain (never for stiffness alone), and replace only when the cuff is intact or restorable. A massively retracted cuff points toward arthrodesis instead. This 15-patient series is an early step in the arc that led to Neer's shoulder arthroplasty system.
Neer's early description of degenerative disease of the proximal humeral articular surface. He separates primary osteoarthritis from secondary lesions (trauma, rheumatoid, metabolic, avascular necrosis) and outlines diagnosis and treatment. The paper reports one of the first series of vitallium humeral head replacements.
The central decision rule here is that glenohumeral incongruity is a diagnosis of exclusion. Neer's cadaver data show degenerative change in 28% of shoulders that likely functioned normally, so radiographic joint-space narrowing alone does not explain a patient's pain. Before blaming the joint surface, rule out the cuff, bursa, AC joint, cervical spine, infection, and neurotrophic causes.
The biomechanical mental model is the fulcrum: the humeral head lets the deltoid and cuff generate abduction. Excise the head and you lose the fulcrum, which is why resection failed and why replacement, which restores contour, succeeded.
Management sequence to remember: minimum 3 months of nonoperative care, operate only for intolerable pain (never for stiffness alone), and replace only when the cuff is intact or restorable. A massively retracted cuff points toward arthrodesis instead. This 15-patient series is an early step in the arc that led to Neer's shoulder arthroplasty system.