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Tapered, titanium HA-coated femoral implant performed well at 7 years follow-up
Cho JH. Clin Orthop Surg. 2010;2:214-220.
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Results of this prospective study showed that a tapered, titanium, hydroxyapatite-coated femoral stem delivered excellent mechanical fixation and reliable osseointegration.
This study included 78 consecutive patients (86 hips). Average age at the time of surgery was 59 years for the 35 men and 43 women enrolled.
Jin-Ho Cho, MD, of Inje University College of Medicine, Goyang, Korea, and colleagues used a tapered, titanium, hydroxyapatite (HA)-coated femoral implant. (Corail, DePuy Orthopaedics Inc.). One surgeon performed each surgery through a posterolateral approach with the patient in the lateral position. The researchers used the D’Aubigne and Postel scoring system for the clinical evaluation; they assigned hip scores according to pain level, functional status and range of motion. Patients had radiographs at 6 weeks, 3, 6 and 12 months, and annually thereafter.
Follow-up was a minimum of 7 years. Although 11 hips had acetabular failure requiring revision of the acetabular component, the femoral stem survived and was available for long-term follow-up. For an additional 20 hips, the researchers obtained radiographs at 7 years but the patients would not submit to a clinical evaluation. In these cases, the researchers conducted phone interviews to assess functional status changes.
There were no aseptic loosening cases. Bone response was stable at more than 7 years’ follow-up. There was no evidence of subsidence or component migration, indicating that implant stability was achieved early and reliably, the authors wrote. Four hips had incomplete radiolucencies but none affected more than 30% of the interface.
“The mechanical fixation of a tapered, titanium, HA-coated femoral implant was excellent in this study,” the authors wrote. “This femoral design provided reliable osseointegration that was durable at a mean 7 years’ follow-up.”