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Hydroxyapatite-coated stem maintains long-term pain relief, hip function

Issue: Issue 5 2012

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MANCHESTER — Total hip arthroplasty performed with a titanium femoral component fully coated with hydroxyapatite yields long-term pain relief and hip function, according to a presenter here at the British Orthopaedic Association Congress 2012.

Investigators at Conquest Hospital, in Hastings, United Kingdom, studied the long-term results of total hip arthroplasty (THA) performed with the Furlong femoral component (JRI Orthopaedics Ltd., London). According to the clinical and radiologic results, pain relief and hip function at a mean of 22.5 years was comparable to THA performed with other prostheses and fixation methods.

“Our results suggest that biological fixation seems to be durable given the patient’s age and the bone that comes from osteopenia,” Nemandra Sandiford, MRCS, said.

 

Nemandra Sandiford

At last follow-up, 60 patients in the original cohort were alive with 72 hips in situ. The mean age was 82.9 years. Sandiford and colleagues followed up the cohort using the Merle d’Aubigné Postel score for hip function and the Visual Analog Scale for patient satisfaction, and determined implant survivorship with a Kaplan-Meier survival analysis.

“There continued to be significant improvement in all aspects of the Merle d’Aubigné Postel score and all but two patients remained very satisfied,” Sandiford said. “Survival of the femoral component with revision for any cause as the endpoint was 98% at 22.5 years.”

According to Sandiford, three designs of acetabular components – one uncemented and two cemented – were paired with the hydroxyapatite-coated stems over the years. Five cups needed revision for aseptic loosening, which did not impact the stems. One stem needed revision for an infection 21 years after surgery, he said.

Reference:

Sandiford N, Doctor C, Ahmed S, et al. Primary total hip arthroplasty with a fully hydroxyapatite coated titanium femoral component: Results at a minimum follow-up of twenty years. Paper #24. Presented at the British Orthopaedic Association Congress 2012. Sept. 11-14. Manchester.