Abstract
Resurfacing total hip replacement using metal on metal bearings is increasing in popularity, but the outcomes are currently unclear. We report a series of 23 hips in 20 patients who underwent resurfacing total hip replacement over a period of 4 years. The mean age at surgery was 47 years (21–61). There were 8 females and 12 male patients. The mean follow up was 27 months (range 6 to 50 months). Before performing this study, our impression was that most outcomes were good but that there appeared to be more variability in pain relief than anticipated after conventional total hip replacement. Most were performed for primary osteoarthritis; other diagnoses included AVN, DDH and multiple epiphyseal dysplasia. Outcomes were measured examining x rays, survival of the implant and the Oxford hip questionnaire.
There were no early revisions, but we are aware of one loose acetabular cup (in a patient with DDH) which is asymptomatic but which will probably require revision. There were no femoral neck fractures. The median score using the Oxford hip questionnaire was 15 (mean 23.5; range 12 to 41). These outcomes compare favourably with those reported at 6 months follow up after conventional total hip replacement by the Oxford group (OHQ median score 22; mean 24.3 (12 to 51)).
We conclude that resurfacing metal on metal hip replacement gives comparable results to total hip replacement at early follow up. The age of the Oxford groups patients was considerably older than ours (75 years), and a comparative trial of resurfacing versus conventional hip replacements will be required to determine which gives better short and long term results in young patients. There may be more variability in pain relief after resurfacing THR than after conventional THR, but this will require a larger study to determine with confidence.
Theses abstracts were prepared by Mr Peter Kay. Correspondence should be address to him at The Hip Centre, Wrightington Hospital, Appley Bridge, Wigan, Lancashire WN6 9EP.
