My daughter is just 7 but tall - (over 95th%), she does ballet and swimming and both have noticed that she has issues with hip stability on one side. This makes her drag her left side and also causes issues with balance. The ballet teacher said she has no natural bend but I don't really know what that means (she has good feet though!!). She was a breech baby and so had all the hip dysplasia stuff and never presented any problems so I'm not sure it could be that. I've booked a doctor's appointment but wondered if anyone out there might be able to suggest other causes - my google-fu only seems to throw up dysplasia.