The relationship between head-neck ratio and pseudotumour formation in metal-on-metal resurfacing arthroplasty of the hip

Reference:

Grammatopoulos, G., Pandit, H., Murray, D. W. and Gill, H. S., 2010. The relationship between head-neck ratio and pseudotumour formation in metal-on-metal resurfacing arthroplasty of the hip. Journal of Bone and Joint Surgery - British Volume, 92 (11), pp. 1527-1534.

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Official URL:

http://dx.doi.org/10.1302/0301-620X.92B11.24640

Related URLs:

• http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?cmd=Retrieve&db=PubMed&dopt=Citation&list_uids=21037347

Abstract

Pseudotumour is a rare but important complication of metal-on-metal hip resurfacing that occurs much more commonly in women than in men. We examined the relationship between head-neck ratio (HNR) and pseudotumour formation in 18 resurfaced hips (18 patients) revised for pseudotumour and 42 asymptomatic control resurfaced hips (42 patients). Patients in whom pseudotumour formation had occurred had higher pre-operative HNR than the control patients (mean 1.37 (sd 0.10) vs mean 1.30 (sd 0.08) p = 0.001). At operation the patients with pseudotumours had a greater reduction in the size of their femoral heads (p = 0.035) and subsequently had greater neck narrowing (mean 10.1% (sd 7.2) vs mean 3.8% (sd 3.2) p <0.001). No female patient with a pre-operative HNR

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