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The Journal of Bone and Joint Surgery, Vol 57, Issue 2 230-236, Copyright © 1975 by Journal of Bone and Joint Surgery, Inc

JOURNAL CONTENTS

Failed femoral stems in total hip prostheses. A report of six cases

JO Galante, W Rostoker and JM Doyle

Six femoral stems of total joint prostheses failed and were studied. These included two short-neck Muller, one standard Muller, one new design long-neck Muller, and two Charnley prostheses. In addition, reference is made to another failed Charnley prosthesis which had not required revision at the time of the study. Reoperation and replacement of the femoral component was required in all six cases. Metal fatigue appeared to be the cause of failure in all instances. Metallographic examination of the removed prosthesis revealed no underlying defects in one prosthesis. In the other five prostheses metallurgical defects were found. Varus placement of the femoral prosthesis or loosening of the cement-prosthesis bond, or both, were identified in five of the six and were thought to have led to overload. A combination of metal defects and loosening or malpositioning was thought to be responsible for the failures. It was further indicated that current designs should be regarded as marginal in relation to long service life, until more fatigue information is available on the metallic materials currently in use.
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