HEAD-NECK MODULARITY FOR TOTAL HIP-ARTHROPLASTY - IS IT NECESSARY

Although modular head-neck combinations for femoral components are con venient and useful, theoretical concerns make them less attractive. In a consecutive series of 100 primary cementless total hip arthroplasti es, the neck length chosen for the broach trial reduction was compared with the final neck length chosen after the actual femoral component had been impacted. In 19%, the neck length was changed after insertion of the femoral component. As a result, leg-length inequality or wasta ge of these femoral components would have resulted. For cementless fem oral components, the ability to adjust neck length after component imp action remains important.