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Results of the total bi-metric cementless hip arthroplasty
K Robertsen1, M Gaarden, G Teichert
1Department of Orthopedics, Horsens County Hospital, Denmark.
Insights
The Bi-Metric hip prosthesis demonstrates acceptable outcomes in patients undergoing cementless hip arthroplasty. High Harris hip scores and functional levels were observed, indicating good patient satisfaction and joint performance.
Area of Science:
- Orthopedic Surgery
- Biomaterials Science
- Medical Device Technology
Background:
- Cementless hip arthroplasty is a common procedure for hip joint replacement.
- Porous-coated implants aim to promote bone ingrowth for long-term fixation.
- The Bi-Metric System is a specific type of cementless, porous-coated hip prosthesis.
Purpose of the Study:
- To evaluate the clinical and radiographic outcomes of the Bi-Metric System cementless hip arthroplasty.
- To assess patient-reported outcomes such as hip function and pain.
- To analyze complications and radiographic findings at a minimum 2-year follow-up.
Main Methods:
- A prospective follow-up study of 50 primary Bi-Metric System cementless hip arthroplasties.
- Assessment of patient outcomes using the Harris hip score and d'Aubigné pain score.
- Radiographic evaluation using Engh's x-ray score and assessment of heterotopic ossification (Brooker et al.) and leg length discrepancy.
Main Results:
- Average Harris hip score of 96 points and d'Aubigné pain score of 5.87, indicating good functional outcomes.
- Average femoral component Engh's x-ray score of 19 points.
- Low incidence of revision (2/50) for infection or loosening; 23 patients showed heterotopic ossification (mostly Brooker group I-II).
Conclusions:
- The Bi-Metric hip prosthesis achieves acceptably high Harris Hip Scores at 2-year follow-up.
- The implant demonstrates favorable clinical and radiographic results in the short-to-medium term.
- Further long-term studies are warranted to confirm durability and address potential complications like heterotopic ossification.
Abstract:
A 2.9-year follow up of 50 primary Bi-Metric System cementless, porous-coated hip arthroplasties (Biomet) is presented. Four patients were operated bilaterally. In two patients, revision arthroplasty was carried out, in one because of infection, in the other because of loosening of the stem. The average Harris hip score was 96 points. The pain level according to d'Aubigné was 5.87. All patients belonged to Jensen's social function group 1. According to Engh's x-ray score, the femoral component achieved an average total of 19 points. Twenty-three patients with heterotopic ossification were graded according to Brooker et al; 18 patients belonged to group I-II, and 5 patients to group III. Discrepancy of leg length was measured in 20 patients, and averaged 0.52 cm (range: 0 cm to 2.5 cm). Four patients complained of thigh pain, but they had no radiographic evidence of loosening of components. The mean age was 63.4 years for women and 58.1 for men. Acceptably high Harris Hip Scores were obtained for the Bi-Metric hip prosthesis at 2-year follow up.