The rationale for an inferior screw close to the calcar is that the inferior cortex can act as a buttress for an adjacent screw if good screw purchase in the femoral head is obtained.

• 靠近股骨距的螺钉的生物力学原理是下方的皮质能形成附近螺钉的支撑，如果这个螺钉位置很好的话。