Fig. 1

a Preoperative radiography. b Postoperative radiography and the arrow indicate negative buttress. c After a 2-year follow-up, the radiography shows femoral neck shortening and varus deformity
a Preoperative radiography. b Postoperative radiography and the arrow indicate negative buttress. c After a 2-year follow-up, the radiography shows femoral neck shortening and varus deformity