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Total Hip Arthroplasty Using the S-ROM-A Prosthesis for Anatomically Difficult Asian Patients
Akira Hozumi1, Kyousuke Kobayashi1, Nobuhisa Tsuru1
1Department of Orthopaedic Surgery, Nagasaki University Hospital, 1-7-1 Sakamoto, Nagasaki 852-8501, Japan.
Biomed Research International
|November 20, 2015
Summary
The S-ROM-A prosthesis shows good short- to midterm results for Japanese patients with proximal femoral deformity. This hip implant is effective for severe dysplasia and narrow canals, even after osteotomy.
Area of Science:
- Orthopedic Surgery
- Biomaterials Engineering
Background:
- The S-ROM-A prosthesis is specifically designed for Asian proximal femurs, characterized by small, deformed shapes and narrow canals.
- Severe hip deformities, including those from dysplasia and excessive posterior pelvic tilt, present unique challenges in total hip arthroplasty (THA).
Purpose of the Study:
- To evaluate the clinical and radiological outcomes of the S-ROM-A prosthesis in Japanese patients with severe proximal femoral deformities.
- To assess the efficacy of the S-ROM-A prosthesis in cases involving prior osteotomy and significant pelvic tilt.
Main Methods:
- A cohort of 94 hips in Japanese patients undergoing primary THA with the S-ROM-A prosthesis was retrospectively reviewed.
- Follow-up averaged 55 months, with patients averaging 61 years at surgery. Preoperative diagnoses included coxarthritis (dysplasia, primary OA), avascular necrosis, traumatic arthritis, and Perthes disease.
- Radiological assessment included intramedullary canal shape (stovepipe, normal, champagne-flute) and pelvic inclination angle; implant fixation was evaluated using the Engh classification.
Main Results:
- The mean Japanese Orthopaedic Association (JOA) score significantly improved from 46 preoperatively to 80 at final follow-up.
- Radiological evaluation revealed excellent implant fixation, with 97% of hips (92 out of 94) classified as "bone ingrown fixation" according to the Engh criteria.
- The prosthesis demonstrated successful integration and stability in a challenging patient population.
Conclusions:
- The S-ROM-A prosthesis provides favorable short- to midterm clinical and radiological outcomes in primary THA for Asian patients with proximal femoral deformities.
- Its design is suitable for addressing complex cases, including those with significant deformity, prior osteotomy, and posterior pelvic tilt.
- The S-ROM-A prosthesis represents a viable option for improving function and fixation in challenging hip arthroplasty cases.
