Abstract
Aim: The S-ROM femoral component is a versatile modular prosthesis that can be adapted to the majority of complex hip revision situations. The purpose of this study is to review the results of this prosthesis with a minimum follow-up of two years.
Method: Fifty-six consecutive revision hip arthroplasties using the S-ROM femoral component were performed in 49 patients by the senior author. The patients with segmental femoral allografts were excluded. A retrospective chart review and radiographic analysis was performed and the pre-operative and post-operative modified Harris hip scores compared.
Results: Forty-nine patients with 56 hips were evaluated between two and seven years after revision surgery. There were 25 females and 24 males. The average age was 66.6 years (range: 44.8 to 94.6). Revision arthroplasties were performed for loose components in 36 hips, infected components in 10 hips, recurrent dislocation in three hips and for miscellaneous diagnoses in seven. The average number of previous surgical procedures on the affected hip was 2.4 (range: one to seven). The modified Harris hip score improved from a pre-operative average of 42 to a post-operative average of 73 at the most recent follow-up examination. Three patients had failed revisions at seven years (5%). One patient underwent a resection arthroplasty for infection, one patient underwent re-revision for recurrent dislocation and one patient dislocated, became infected and is on suppressive antibiotic therapy. Other complications included nine dislocations (16%), seven intra-operative fractures (13%), trochanteric irritation in five patients (9%), residual thigh pain in three patients (5%), heterotopic ossification in two patients (4%), one post-operative sciatic nerve palsy (2%) and early osteolysis in one patient (2%).
Conclusion: Short to intermediate term follow-up of the S-ROM femoral component in this group of revision patients has yielded excellent results. In terms of loosening and osteolysis these results are comparable to primary hip arthroplasty using the S-ROM prosthesis.
The abstracts were prepared by Professor Alan Thurston. Correspondence should be addressed to him at the New Zealand Orthopaedic Association, PO Box 7451, Wellington, New Zealand.
