Retrospective cohort of 208 patients with AO/OTA 31-A1 and 31-A2 intertrochanteric fractures treated with DHS. The study asks: can pre-operative lateral wall thickness predict which patients will develop a post-operative lateral wall fracture — a complication with no established predictor before this paper.
Before this paper, no quantitative pre-operative predictor existed for post-operative lateral wall fracture — surgeons treating intertrochanteric fractures with DHS had no reliable way to identify which patients were headed toward a nearly 50% failure rate.
Measure lateral wall thickness on the pre-operative AP radiograph for every intertrochanteric fracture. If thickness is < 20.5 mm, DHS alone is contraindicated. Use a cephalomedullary nail or add a trochanteric stabilizing plate.
AO/OTA 31-A2 pattern is a red flag on its own: 35% will fracture the lateral wall post-operatively, and when they do, half will fail. The A2 classification should prompt you to measure the wall before committing to a DHS.
The mechanistic insight worth retaining: in A1 fractures the intact posteromedial cortex rescues the construct even when the lateral wall fractures (all three A1 wall-fracture patients healed without reoperation). In A2 fractures that backstop is gone, making the lateral wall the last line of defense.
Retrospective cohort of 208 patients with AO/OTA 31-A1 and 31-A2 intertrochanteric fractures treated with DHS. The study asks: can pre-operative lateral wall thickness predict which patients will develop a post-operative lateral wall fracture — a complication with no established predictor before this paper.
Before this paper, no quantitative pre-operative predictor existed for post-operative lateral wall fracture — surgeons treating intertrochanteric fractures with DHS had no reliable way to identify which patients were headed toward a nearly 50% failure rate.
Measure lateral wall thickness on the pre-operative AP radiograph for every intertrochanteric fracture. If thickness is < 20.5 mm, DHS alone is contraindicated. Use a cephalomedullary nail or add a trochanteric stabilizing plate.
AO/OTA 31-A2 pattern is a red flag on its own: 35% will fracture the lateral wall post-operatively, and when they do, half will fail. The A2 classification should prompt you to measure the wall before committing to a DHS.
The mechanistic insight worth retaining: in A1 fractures the intact posteromedial cortex rescues the construct even when the lateral wall fractures (all three A1 wall-fracture patients healed without reoperation). In A2 fractures that backstop is gone, making the lateral wall the last line of defense.