Bosworth posterior approach to femur. A, To expose proximal part of middle three fifths of femur, long head of biceps femoris has been retracted medially. Inset, Skin incision. B, To expose distal part of middle three fifths of femur, long head of biceps femoris and sciatic nerve have been retracted laterally. C, To expose entire middle three fifths of femur, long head of biceps femoris has been divided in distal part of wound, and this muscle and sciatic nerve have been retracted medially. D, Sciatic nerve would be subject to injury if entire middle three fifths of femur were exposed by retracting biceps femoris laterally. SEE TECHNIQUE 1.60.