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Figure 2 | Patient Safety in Surgery

Figure 2

From: Failure of fixation of trochanteric femur fractures: Clinical recommendations for avoiding Z-effect and reverse Z-effect type complications

Figure 2

Case 2 - Radiographic images showing the intertrochanteric fracture that was fixed with a proximal femoral nail - (A) preoperative and (B) postoperative; (C and D) the lateral migration of the superior screw and perforation of the femoral head by the inferior screw (reverse Z-effect); (E) the incorrect positioning of the interlocking screws in the lateral incidence, together with poor bone material, may have been responsible for the reverse Z-effect; (F) the removal of the material of osteosynthesis is shown together with signs of chondrolysis of the hip.

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