Mid-term results of 155 patients treated with a collum femoris preserving (CFP) short stem prosthesis

Abstract

Short stem prostheses that preserve the femoral neck are becoming more and more popular. The CFP (collum femoris preserving) has been introduced especially for the treatment of younger patients. However, information about remodelling, complications and learning curve are thus far rare. We present a retrospective study of 155 patients (average age 59.3±9.9 years) who underwent total hip replacement with the CFP prosthesis. Follow-up was obtained 74.3±9.4 months postoperatively. The Harris hip score revealed excellent and good results in 96%. One stem had to be exchanged due to aseptic loosening revealing a survival rate of 99% and 100% for stem and cup, respectively. Radiological analysis showed typical patterns of remodelling with apearance of cortical thickening predominantly in the distal part of the prosthesis. Implant related revision rate was <1%, with further complication rate independent of the surgeon's individual experience. With regard to outcome, survivorship and complication rate, the medium-term results of the CFP prosthesis are promising.

The accuracy of digital templating: a comparison of short-stem total hip arthroplasty and conventional total hip arthroplasty

“…Short-stem total hip arthroplasty has rapidly increased over recent years and shown good clinical short-term results [17,18]. However, little is known about the value and accuracy of pre-operative templating in SHA.…”

Biomechanical reconstruction of the hip: comparison between modular short-stem hip arthroplasty and conventional total hip arthroplasty

“…Good clinical results have been reported for short-stem hip arthroplasty (SHA) [8][9][10][11], which was introduced several years ago, but only now is being performed in increasing numbers. However, little is known about the ability of SHA to reconstruct the limb length and the biomechanics of the hip [12].…”

Neck-Preserving Femoral Stems

“…Survival of the CFP stem has been reported as 100% at 3 years [18] and 98-99.4% at 6 years [6,31]. One series reported good-to-excellent clinical outcome in 91% of patients, with 96% of stems showing complete bony ingrowth [31].…”

“…A retrospective study of 155 CFP stems reported good-toexcellent outcomes in 95.7% of patients at a mean follow-up of 6 years [6]. However, they noted osteopenic changes in the proximal femur and osteosclerotic transformation distally.…”

“…The incidence of thigh pain, which can suggest stem micro-motion, has been reported as 0% to 14% [6,39], with one series reporting a residual limp in 9% [31].…”