Ten-year follow-up of the non-porous Allofit cementless acetabular component

Abstract

Cementless acetabular fixation has demonstrated superior long-term durability in total hip replacement, but most series have studied implants with porous metal surfaces. We retrospectively evaluated the results of 100 consecutive patients undergoing total hip replacement where a non-porous Allofit component was used for primary press-fit fixation. This implant is titanium alloy, grit-blasted, with a macrostructure of forged teeth and has a biradial shape. A total of 81 patients (82 hips) were evaluated at final follow-up at a mean of 10.1 years (8.9 to 11.9). The Harris Hip Score improved from a mean 53 points (23 to 73) pre-operatively to a mean of 96 points (78 to 100) at final review. The osseointegration of all acetabular components was radiologically evaluated with no evidence of loosening. The survival rate with revision of the component as the endpoint was 97.5% (95% confidence interval 94 to 100) after 11.9 years. Radiolucency was found in one DeLee-Charnley zone in four acetabular components. None of the implants required revision for aseptic loosening. Two patients were treated for infection, one requiring a two-stage revision of the implant. One femoral stem was revised for osteolysis due to the production of metal wear debris, but the acetabular shell did not require revision. This study demonstrates that a non-porous titanium acetabular component with adjunct surface fixation offers an alternative to standard porous-coated implants.

10-year results of the uncemented Allofit press-fit cup in young patients

“…For optimal press-fitting, the cavity was under-reamed by 2 mm in relation to the peripheral dimension of the device. The implant is available with screw holes for additional fixation, or with a solid continuous outer surface without holes (Zenz et al 2009). We used the solid device without additional screw fixation in all patients.…”

Long-term results with the Atlas IIIp elastic cementless acetabular component in total hip replacement

“…Osteolysis was defined as a lucent zone devoid of trabecular bone and usually with a sclerotic border not visible on the immediate postoperative radiograph [6,7]. The acetabular component was considered to be loose if there was migration of >3 mm in any direction over time or a circumferential radiolucent line.…”

Minimum ten-year results of a 28-mm metal-on-metal bearing in cementless total hip arthroplasty in patients fifty years of age and younger

“…Acetabular radiolucent lines and osteolysis were described according to the zones established by DeLee and Charnley [11]. Osteolysis was defined as a lucent zone devoid of trabecular bone with a sclerotic border, not visible on the immediate postoperative radiographs [1,12]. The acetabular component was considered to be loose if there was migration of >3 mm horizontally or vertically on serial radiographs, a circumferential radiolucent line or breakage of acetabular screws [12].…”

“…Osteolysis was defined as a lucent zone devoid of trabecular bone with a sclerotic border, not visible on the immediate postoperative radiographs [1,12]. The acetabular component was considered to be loose if there was migration of >3 mm horizontally or vertically on serial radiographs, a circumferential radiolucent line or breakage of acetabular screws [12]. Femoral loosening was defined as progressive axial subsidence or varus or valgus tilting [13].…”