Summary Closed reduction in hyperextension as suggested by Clark (1935) was carried out in 10 cases of fracture of the tibial spines in which the fragment was elevated from its osseous bed. Eight patients were followed-up. Bone apposition was good or fairly good in all cases but one. All patients were satisfied with the result, although there was slight anteroposterior instability of the knee in two cases. No lateral instability nor loss of motion was observed.