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High 10-year survivorship seen with tri-tapered femoral stem for THA
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Investigators of this study found more than 98% stem survivorship at 10 years among older patients who underwent primary total hip arthroplasty with a cannulated tri-tapered femoral stem.
Between September 1997 and October 2001, researchers implanted 110 tri-taper stems (Cremascoli-Ortho) in 98 patients with osteoarthritis of the hip. The patients were 65 years to 85 years old, and had a mean age of 73.5 years at the time of the primary arthroplasty.
Investigators found the mean Oxford Hip Score improved from 13.46 preoperatively to 37.04 at 10 years. At 10 years, results showed a stem survival rate of 100% using revision for aseptic loosening as the endpoint and a stem survival of 98.2% using revision for any cause as the endpoint. Two stems were revised prior to 10 years, including one for deep wound infection and another for recurrent dislocation. Researchers found other adverse events included excision of heterotopic ossification, open repair of abductor tendons and steroid injection of trochanteric bursitis.
Researchers observed radiolucent lines at the cement-bone interface in 36 cases, at the prosthesis-cement interface in 14 cases and at both interfaces in seven cases at 10 years. Overall, 94% of stems were in neutral position and all stems were aligned within 2° of the central axis of the canal. Radiographs for 70 hips showed 35.7% had grade zero heterotopic ossification (HO), 20% had grade I HO, 24.3% had grade II HO and 12.9% had grade III HO. – by Casey Tingle
Disclosures: Rajakulendran reports no relevant financial disclosures. Please see the full study for a list of all other authors’ relevant financial disclosures.
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