Clinical experience with primary cemented total hip arthroplasty.

Results obtained with 433 cemented prostheses with original design, implanted at Exeter since 1969, are presented. Clinical and radiographic findings were evaluated on 88% of cases at 7,4-13, 4-16, 4 follow-ups. Average age at surgery was 66,7 years. Sixty-two (14,3%) prostheses have been revised. Stem loosening was evident in 13 (3%) cases, of which 11 were revised. Socket loosening was evident in 21 patients (4,9%), all revised. Due to sepsis 7 prosthetic were explanted (Girdlestone) were done. Stem sinking > 2 mm into the cement mantle was observed at 16,4 years follow-up in 15% of cases, with no relation to pain. None of the patients showed a complete radiolucent line around the stem. The biomechanical relevance of the tapered design of a smooth and collarless stem for the cemented implant is discussed.