Proximal loading of the femur leads to low subsidence rates: first clinical results of the CR-stem
Mazoochian, F., Schrimpf, F.M., Kircher, J. et al.Hip
Introduction
A new femoral stem was developed with a design that leads to compression of cancellous bone in the calcar region which results in proximal loading. The cross-sectional design of the implant provides rotational stability.
Materials and methods
In the first clinical investigation ten patients underwent uncemented total hip arthroplasty between January 1999 and May 1999 using the CR-stem® (Implantcast GmbH, Buxtehude, Germany). Results were investigated using the Harris-hip-score (HHS) and antero-posterior and lateral radiographs. Migration was evaluated with the EBRA-FCA-method with a follow-up of 7 years.
Results
We demonstrated a mean subsidence rate of 2.23 ± 1.13 mm 7 years after implantation thus providing basic data for extensive testing in a clinical environment.
Discussion
As small subsidence rates are regarded as predictor for superior long-term results in uncemented total hip arthroplasty according to the literature, the CR-stem shows promise for excellent long-term results.
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