Nineteen Year Results of THA Using Modular 9 mm S-ROM Femoral Component in Patients With Small Femoral Canals

A retrospective analysis was undertaken of 30 consecutive THA performed in 25 patients with hypoplastic proximal femurs, who had received a 9-mm uncemented modular S-ROM stem. The mean patient age was 42 years (17–69 years), mean height was 152.5cm (130–170.5 cm), mean weight was 63 kg (39–90 kg), and mean follow-up period was 19 years (range, 12–23 years). Subsidence was seen in 2 hips, with asymptomatic femoral osteolysis present in 11 hips; overall survival of the femoral stem was 93.3%, with two revisions of the femoral component required for aseptic loosening. After a mean follow-up of 19 years, the use of the S-ROM 9 mm femoral stem in the patient with the small femur was associated with a low revision rate due to aseptic loosening of the stem.