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without being so bold as to ask your age, you must have been quite young - in hip replacement terms - when you had them done sqad. i was told numerous times when i was having investigations to see what was causing my initial hip pain 10 years ago, that i was very young and that's one of the reasons (probably the main one) i had resurfaced hips - bone conservation and large ball and socket making dislocation less likely in a very active person.
i'm hoping it's not the implants failing, x-rays don't show anything, an mri scan is being organised and have today had blood taken to check for abnormal metal (chromium i think) levels. birminghams are relatively new so they don't have the same history your charnley ones do sqad (well, you'll already know that). thanks for that link doctor dear :o)