A CASE SERIES OF NINETY-NINE HYBRID METAL-ON-METAL HIPS – BIRMINGHAM RESURFACING CUPS AND BIRMINGHAM MODULAR HEADS.

Abstract

Birmingham Hip resurfacings have been a popular mode of treatment for younger and more active patients with arthritis of the hip. However the use of hybrid hip arthroplasty system with a Birmingham hip resurfacing cup and modular head with a variety of cemented/uncemented stems is less well described in the literature.

We analysed radiographic and clinical outcomes of 99 consecutive hybrid hip arthroplasties performed by a single surgeon between 2000 and 2006.

A total of 93 patients (52 females and 41 males) with an average age of 69.9 (47 to 88) and average BMI of 28.8 (18.7 to 140.9) had arthroplasties with a mean follow up of 4.1 Yrs (1 to 6.3 years). 57 right and 42 left hip arthroplasties were performed of which 6 patients had bilateral consecutive hybrid hip arthroplasties.

93 were performed for osteoarthritis, 4 for RA, 5 patients for revision of failed hip resurfacing arthroplasties with #NOF and 1 revision for failed THR.

No patients had dislocations and one patient had revision of a resurfacing cup secondary to hip pain due to excessive cup anteversion, no loosening of components were identified at the most recent follow-up and all patients were mobilising well with no complaints of pain.

Hip Resurfacing procedures are gaining popularity in the younger individuals with arthrosis of the hip. Some patients who are fairly independent and active fall short of satisfying the criteria for a hip resurfacing and we preferred the option of the Birmingham hip resurfacing cup with a large modular head and a compliment of stems. This metal-on-metal option with large heads would ideally increase stability and reduce wear patterns with the prospect of increasing longevity of total hip arthroplasties.