Abstract
Radiographs revealed defective endochondral ossification in proximal femora of 52 lame broilers. Cartilage retention either involved epiphyseal cartilage close to the articular surface or growth plate cartilage (dyschondroplasia). In at least seven birds proximal femoral lesions were the only abnormalities detected which could have caused lameness. In cases of moderate or severe cartilage retention, fracture lines traversed necrotic cartilage to undermine part or all of the femoral head. Evidence of reparative fibrosis was seen with augmentation of metaphyseal trabeculae by woven bone apposition. Foveal blood vessels aided repair by re-establishing a new ossification centre but in many cases attempts at repair were inadequate.
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