Fig. 1
Artificial femoral bone of the right side, when a lag screw is inserted, it generates a clockwise rotational force and the proximal fragment is rotated internally.

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Fig. 2
Artificial femoral bone of the left side, when a lag screw is inserted, it generates a clockwise rotational force and the proximal fragment is rotated externally.

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Fig. 3
The proximal fragment was located in the intramedullary area (A) and the extramedullary area (B). The proximal fragment rotated internally (C) and externally (D).

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Fig. 4
An 85-year-old female patient with left side intertrochanteric fracture underwent surgery using a proximal femur nail. (A) Preoperative anteroposterior and axial radiographs showing a displaced intertrochanteric fracture. (B) Initial three-dimensional computed tomography (CT) revealed an AO/OTA 31-A2.3 fracture. (C) Preoperative axial CT of the proximal greater trochanter area showing that the proximal fragment had been displaced slightly posteriorly (arrow). (D) Preoperative axial CT of the lesser trochanter area showing that the proximal fragment had been displaced posteriorly and intramedullary (arrow). (E) Postoperative anteroposterior and axial radiograph showing that the proximal fragment had been displaced medially and anteriorly. (F) Postoperative axial CT of the proximal greater trochanter area showing that proximal fragment had been displaced posteriorly as compared with its preoperative position (arrow). (G) Postoperative axial CT of the lesser trochanter area showing that the proximal fragment had been displaced anteriorly. These observations showed the proximal fragment had rotated externally (arrow).

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Table 1
Patient Demographics

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Table 2
Comparison of Results

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