Abstract:

BACKGROUND: Determining the anchor point of femoral neck axial line tail on the femoral lateral wall is the most primary and critical steps for the placement of internal fixator during the treatment of femoral intertrochanteric fractures.
OBJECTIVE: To radiological confirm the anchor point of femoral neck axial line tail on the femoral lateral wall.
METHODS: The central line on the anterior surface of the femoral neck along femoral neck and the vertical central line on femoral proximal lateral wall were drawn on 80 adult femoral specimens. The intersection point of the above two central line was assumed as the anchor point of femoral neck axial line tail on the proximal femoral lateral wall. The thin steel wire was placed around the middle of femoral neck closely and a small steel ball was struck on the anchor point (A) and the on the point which located at 1.0 cm (B), 2.0 cm (C) and 3.0 cm (D) below the slope top point on the longitudinal center line on lateral surface of proximate femur, then the X-ray images were took along the femoral neck axis, and the location of the small steel ball imaging on the wire circle was observed. The distance between the center point of the small steel ball and the wire circle was measured, and the amount of the imaging point in the center.
RESULTS AND CONCLUSION: The proportion of the small steel ball imaging that located on the point A, B, C and D on the center of the wire circle was 85%, 18.75%, 81.25% and 35%, and there was significant difference of the proportion between point B and D and point A (P < 0.05). The intersection point of the central line on the anterior surface of the femoral neck and the vertical central line on femoral proximal lateral wall can be regarded as the anchor point of femoral neck axis tail on femoral lateral wall .