Because osteotomies are used to treat different problems in the knee, there is no single sign or symptom that might suggest you are a candidate. Often patients have abnormal alignment of the knee; however, an abnormality of alignment in the absence of symptoms does not require surgery. Consultation and examination by an orthopedist experienced in limb realignment surgery, in addition to full-length, weight bearing x-rays of both legs, will be very educational and help with your decision on the right treatment for your problem.
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AAOS Orthoinfo osteotomies of the knee