Lessons learned from early clinical experience and results of 300 ASR hip resurfacing implantations

Between August 2003 and April 2005, 300 ASR metal-on-metal resurfacing hip endoprostheses were implanted by the first author and a fellow surgeon. The mean age at surgery was 56.8 years (18-75.9 years) and mean body mass index was 27.6 kg/m2 (range, 19-41 kg/m2). The mean follow-up time was 202 days. The mean Harris hip score improved from 44 pre-operatively to 89 at 3 months post-operatively. In total, eight (2.7 per cent) cases [five neck fractures (1.66 per cent) and three cup revisions (1 per cent)] were revised. Two neck fractures occurred within a group of seven cases of femoral neck notching detected postoperatively; one neck fracture occurred out of two cases of incomplete seating of the femoral implant. A significantly higher (p < 0.001) failure rate was observed for patients who had undergone a previous osteosynthesis of the proximal femur (three revisions in a group of 15 patients). Revision cases had a significantly greater body mass index (p = 0.031). A learning curve was evident from the reduction in revisions from 5 in the first 100 surgical procedures to 2 in the next 100 and 1 in the last 100. These results show the importance of accurate surgical technique and careful patient selection for fourth-generation hip resurfacing implants.

Subjects

Adolescent

Adult

Aged

Arthroplasty, Replacement, Hip

Comorbidity

Equipment Failure Analysis

Female

Femoral Fractures

Femur Head Necrosis

Germany

Humans

Incidence

Male

Middle Aged

Prosthesis Failure

Prosthesis-Related Infections

Reoperation

Risk Assessment

Risk Factors

Surface Properties

Treatment Outcome

DDC Class

610: Medizin

Lizenz

http://rightsstatements.org/vocab/InC/1.0/

Name

095441105x69079.pdf

Size

180.36 KB

Format

Adobe PDF

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Lessons learned from early clinical experience and results of 300 ASR hip resurfacing implantations