Sagittal section through the distal lateral femur of a 10 month old sheep. At 4 months a 5 mm tunnel had been drilled through the growth plate and the drill hole was not filled with a soft tissue graft. The growth plate cartilage did not recover (small arrows). A strong bone bridge occurred (large arrow) resulting in a femoral valgus deformity of 12°. Masson-Goldner staining.