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9Preparation of the humeral shaft

The humeral head should be retroverted approximately 25° relative to the distal humeral epicondylar axis.

Determine humeral head retroversion

The humeral head should be retroverted approximately 25° relative to the distal humeral epicondylar axis. As illustrated, the retroversion guide shows the perpendicular to the humeral head axis. The forearm is perpendicular to the epicondylar axis. The angle between the guide and the forearm equals the retroversion of the humeral head.