Femoral shank for hip prosthesis has metaphysis and diaphysis sections joined by couplings with right- and left-hand threads for corresponding hips

摘要

The femoral shank consists of a metaphysis section (1) with a through channel (5, 6) and a diaphysis component (2) that fits in the channel and is held in place by a threaded coupling (14, 17). The upper end (11) of the diaphysis component has two cylindrical threaded sections of different diameters with opposite threads. This enables the shank coupling to be fitted with a right-hand thread for the patient's left hip and vice versa. In a variant of the design the shank threads can be in an internal bore and the couplings made with external threads to fit them.