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Patients may still be undergoing knee arthroplasty for degenerative lumbar spine and hip osteoarthritis. We suggest heightened awareness at pre- and post-operative assessment and thorough history and examination with the use of diagnostic injections to identify the cause of pain if there is doubt.

Mobile-bearing knee arthroplasty (MBKA) is an alternative to fixed-bearing knee arthroplasty. This was a retrospective study of the Rotaglide Total Knee System. We present the results of the monitoring of 77 patients (85 knees) with a median duration to failure or end of follow up of 8.5 years (range 0.4 to 10

The purpose of this prospective study was to determine if a connecting bar prevented mechanical failure of hip spicas. Eighty-two hip spicas were applied to 70 patients between April 2000 and June 2001 following open or closed reduction for developmental dysplasia of the hip. Bilateral hip surgery was undertaken in 12 patients. Thirty-six spicas were applied with a bar whilst 46 were without. The technique of application was similar in all patients. Overall nine (11%) hip spicas failed (mechanically) prematurely and had to be replaced in hospital under general anaesthesia. All nine were inpatients whose spica did not have a connecting bar (P < 0.005). The rate of spica revision increased with the age of the patient. All parents of failed spica cases (nine cases) preferred the new spica with a bar to the previous one without, because they agreed that the bar made the spica more secure. The bar did not hamper toileting or handling.

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