s of the legs.normal and curved legs.knock knees.bowed leg

anatomy angle ankle arthritis arthrosis bone bowed cartilage child chondromalacia correction damage deformity disease dislocation femur foot genu health human illustration instability joint knee knock leg limb loss medicine menisci meniscus pain patella patellofemoral problem replacement rheumatoid rickets shape skeleton sore tear tibia torn valgum valgus varum varus vector