Abstract

Objective To discuss how to determine the proper implant height in hemiarthroplasty for proximal humeral fractures. Methods We dissected 22 shoulders of 11 adult cadavers, 7 males and 4females. The distance between the upper border of the pectoralis major tendon insertion on the humerus and the top of the humeral head (PMT), tuberostiy height (HT) and humeral length (HL) were measured. The PMT/HL value was calculated. Results The average PMT, HT and HL was (5. 10 ± 0. 54) cm,(0. 78 ±0. 19) cm and (28.9 ± 1.9) cm respectively, while the PMT/HL averaged 17.6%. The deviation between HL × 17. 6% and PMT for each shoulder was less than 0. 5 cm. No significant difference was found between the bilateral sides of PMT, HT and HL ( P ＞ 0. 05). Correlation was demonstrated between PMT and HL. There was no correlation between HT and HL. Conclusions The upper edge of the pectoralis major insertion constitutes a reliable reference point for restoring proper humeral height. In clinical practice, the humeral length can be restored by placing the prosthesis 5. 10 cm or the value of contralateral humeral length multiplying 17. 6% above the upper insertion of the pectoralis major. Key words: Shouler fracutres; Arthroplasty, replacement; Prostheses and implants; Anatomy

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