This Level I RCT from Mayo Clinic randomized 220 patients with OTA/AO 31-A1 through A3 pertrochanteric femur fractures to short versus long cephalomedullary nails. It asks whether nail length affects functional outcomes, complication rates, or tolerance of subtrochanteric fracture extension. 168 patients completed minimum 3-month follow-up (mean 13.9 months).
The debate over short versus long nails for pertrochanteric fractures was largely driven by retrospective data with selection bias — unstable fractures defaulted to long nails, making fair comparison impossible. This is the first Level I RCT to address the question directly with equivalent fracture complexity in both arms.
For most pertrochanteric femur fractures. Including those with up to 3 cm of subtrochanteric extension. A short nail is a safe first choice. The operative time and blood loss savings are real and clinically meaningful in a population with 20–30% one-year mortality.
When you do have a peri-implant fracture, nail length changes what happens next. A fracture around a short nail is usually nondisplaced and nonoperative. A fracture around a long nail is often a displaced intercondylar distal femur injury requiring another major surgery. Worth considering in your preoperative planning for fragile patients.
Regardless of nail length, keep your TAD under 25–28 mm. That single technical variable predicted every cutout failure in this series.
This Level I RCT from Mayo Clinic randomized 220 patients with OTA/AO 31-A1 through A3 pertrochanteric femur fractures to short versus long cephalomedullary nails. It asks whether nail length affects functional outcomes, complication rates, or tolerance of subtrochanteric fracture extension. 168 patients completed minimum 3-month follow-up (mean 13.9 months).
The debate over short versus long nails for pertrochanteric fractures was largely driven by retrospective data with selection bias — unstable fractures defaulted to long nails, making fair comparison impossible. This is the first Level I RCT to address the question directly with equivalent fracture complexity in both arms.
For most pertrochanteric femur fractures. Including those with up to 3 cm of subtrochanteric extension. A short nail is a safe first choice. The operative time and blood loss savings are real and clinically meaningful in a population with 20–30% one-year mortality.
When you do have a peri-implant fracture, nail length changes what happens next. A fracture around a short nail is usually nondisplaced and nonoperative. A fracture around a long nail is often a displaced intercondylar distal femur injury requiring another major surgery. Worth considering in your preoperative planning for fragile patients.
Regardless of nail length, keep your TAD under 25–28 mm. That single technical variable predicted every cutout failure in this series.