Analysis of the complications of the collum femoris preserving (CFP) prostheses

Objective: The aim of this study was to evaluate the clinical and radiological outcomes and complications of total hip arthroplasty (THA) using the collum femoris preserving (CFP) prosthesis. Methods: The study included the 142 hips of 125 patients (mean age: 50 years; range: 38 to 60 years) who underwent THA with CFP prosthesis between January 2004 and December 2011. There were 70 males (82 hips) and 55 females (60 hips). Patients were assessed using the Harris hip score (HHS) and visual analog scale (VAS). Radiographs were evaluated according to the Gruen zones and DeLee and Charnley zones to assess the prosthesis position, loosening and ectopic ossification. Results: Follow-up was obtained over 4.72±2.16 (range: 1 to 8.4) years and no patients were lost to follow-up. Mean HHS improved from 51.43±4.14 points preoperatively to 90.27±6.60 points postoperatively, while VAS scores decreased from 8.3±3.12 to 2.1±1.54 by the final review. The HHS revealed excellent and good results in 87.4% of patients. Mild ectopic ossification occurred in 4 cases (2.8%), which were all Grade 1 according to the Brooker classification and without clinical symptoms. In 5 cases (3.5%), bone loss was found in the proximal femur. Radiolucent lines surrounding the stem were not observed in any case. There was no prosthesis loosening or femoral prosthesis subsidence. The survival rate was 100% for the femoral and acetabular components. Ten fractures (7%) of the lateral femoral diaphysis at the tip of the stem occurred during surgery and none of these required additional treatment. No infection, dislocation or deep vein thrombosis was observed. Conclusion: Total hip arthroplasty with CFP prosthesis appears to be a good option for young patients for a variety of etiologies but close attention should be paid to the prevention of complications.

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