Porous-coated Hip Arthroplasty Research Articles

Results of the total bi-metric cementless hip arthroplasty.

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.

Thigh pain after cementless hip arthroplasty. Annoyance or ill omen

A retrospective review of 148 consecutive porous-coated hip arthroplasties (PCA) showed an incidence of thigh pain of 13% one year after surgery, and 22% at two years. Positive correlations were made with femoral stem subsidence (greater than 2 mm) and with distal periosteal and endosteal bone formation. No positive correlations were made with parameters of bone quality or component fit. Resolution of pain occurred in one-third and an anti-inflammatory agent produced partial relief in two-thirds of the patients. We conclude that thigh pain is secondary to stem instability with distal stress transfer in the absence of stable proximal fixation.

Triphasic Bone Scanning Following Porous-Coated Hip Arthroplasty

In a long-term follow-up evaluation of a homogenous group of patients with a standardized total hip arthroplasty for coxarthrosis, the imaging levels follow a predictable pattern over a prolonged period of time. Because of the prolonged nature of increased uptake in the static phases, the utilization of bone scanning in the early diagnosis and evaluation of the patient with a painful noncemented hip may have little value. Increased blood pool and blood flow studies may indicate localized pathology, but, at the present time, static images of noncemented hip arthroplasty within 12 months of surgery probably are of little diagnostic value.