Internal Fixation of Pauwels Type-3 Undisplaced-incomplete Insufficiency Femoral Neck Fractures with Cephalomedullary Nails.

Femoral neck stress fractures are rare and when treating are difficult to achieve favorable outcomes. This study characterizes outcomes associated with the use of cephalomedullary nails for fixation of Pauwels type-3 vertical femoral neck undisplaced-incomplete insufficiency fractures. Four consecutive patients with a Pauwels type-3 vertical femoral neck tensile insufficiency fracture from 2016 to 2018 were reviewed. Magnetic resonance imaging data revealed tensile visible fracture lines and hip-joint effusions with a high shear angle. For all patients, bone mineral density and vitamin D levels were low; vitamin D therapy was initiated immediately. Surgical procedures were conducted with cephalomedullary nails (Gamma 3 locking nail system; Stryker) under general anesthesia. A cephalomedullary nail appears to be a safe and effective alternative to the use of multiple parallel screws or a sliding hip screw for fixation of vertical femoral neck stress fractures (level of evidence: Level V).