11.09.15
Tri-tapered femoral stems hold up well, according to recent study results.
British and Italian researchers discovered a 98 percent 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, the 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. After a decade, results showed a stem survival rate of 100 percent using revision for aseptic loosening as the endpoint and a stem survival of 98.2 percent using revision for any cause as the endpoint. Two stems were revised before the 10-year endpoint, including one for deep wound infection and another for recurrent dislocation. The data showed 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 percent of stems were in neutral position and all stems were aligned within 2 degrees of the central axis of the canal. Radiographs for 70 hips showed 35.7 percent had grade zero heterotopic ossification (HO), 20 percent had grade I HO, 24.3 percent had grade II HO and 12.9 percent had grade III HO.
British and Italian researchers discovered a 98 percent stem survivorship at 10 years among older patients who underwent primary total hip arthroplasty with a cannulated tri-tapered femoral stem.
Investigators found the mean Oxford Hip Score improved from 13.46 preoperatively to 37.04 at 10 years. After a decade, results showed a stem survival rate of 100 percent using revision for aseptic loosening as the endpoint and a stem survival of 98.2 percent using revision for any cause as the endpoint. Two stems were revised before the 10-year endpoint, including one for deep wound infection and another for recurrent dislocation. The data showed 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 percent of stems were in neutral position and all stems were aligned within 2 degrees of the central axis of the canal. Radiographs for 70 hips showed 35.7 percent had grade zero heterotopic ossification (HO), 20 percent had grade I HO, 24.3 percent had grade II HO and 12.9 percent had grade III HO.