In the Neer classification of proximal humerus fractures, a 'part' is defined as a segment displaced by at least which degree of angulation AND separation?

• A 30 degrees angulation and 5 mm separation
• B 20 degrees angulation and 0.5 cm separation
• C 45 degrees angulation and 1 cm separation ✓
• D 60 degrees angulation and 2 cm separation

Explanation

Neer's 1970 classification divides the proximal humerus into four segments: the articular head, greater tuberosity, lesser tuberosity, and shaft. A 'part' is defined as a segment displaced >1 cm (10 mm) or angulated >45 degrees relative to the adjacent segment. If no segment meets these criteria despite the number of fracture lines, it is classified as a one-part (minimally displaced) fracture regardless of the fracture pattern. This threshold has been widely used to guide operative versus non-operative decisions.

Reference: Maheshwari Essential Orthopaedics, 6th ed.

High-yield for: NEET PGINI-CETNExTFMGEUSMLEPLABMRCP

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