This 1988 prospective cohort from the Maryland Shock Trauma Center enrolled 97 patients with 100 femoral shaft fractures treated by static interlocking intramedullary nailing. The central question: does static fixation require routine conversion to dynamic fixation (dynamization) to achieve union? The paper provides direct evidence to answer this question with a large, consecutive series followed to fracture union.
In the 1980s, early reports from Grosse-Kempf and others promoted scheduled dynamization at 10–12 weeks as a routine step after static interlocking nailing, based on concern that shielding the fracture from axial load would impair healing. This paper directly challenged that practice.
With a 98% union rate using static fixation alone, Brumback established dynamization as a selective rescue maneuver — not a protocol step. When you see a statically locked femoral nail at follow-up with progressive callus and no symptoms, do not remove screws on a schedule.
When radiographic healing is clearly inadequate and dynamization is warranted, wait until at least 16 weeks and remove the distal screws. Removing the proximal screw risks cephalad nail migration; removing screws too early in a Type III–IV comminuted fracture risks shortening.
This paper is also why we watch for proud screw heads as a distinct clinical problem, separate from non-union. Trochanteric bursitis or snapping ITB at the nail entry site after femoral nailing should prompt you to examine screw prominence on imaging, not assume the fracture has failed.
This 1988 prospective cohort from the Maryland Shock Trauma Center enrolled 97 patients with 100 femoral shaft fractures treated by static interlocking intramedullary nailing. The central question: does static fixation require routine conversion to dynamic fixation (dynamization) to achieve union? The paper provides direct evidence to answer this question with a large, consecutive series followed to fracture union.
In the 1980s, early reports from Grosse-Kempf and others promoted scheduled dynamization at 10–12 weeks as a routine step after static interlocking nailing, based on concern that shielding the fracture from axial load would impair healing. This paper directly challenged that practice.
With a 98% union rate using static fixation alone, Brumback established dynamization as a selective rescue maneuver — not a protocol step. When you see a statically locked femoral nail at follow-up with progressive callus and no symptoms, do not remove screws on a schedule.
When radiographic healing is clearly inadequate and dynamization is warranted, wait until at least 16 weeks and remove the distal screws. Removing the proximal screw risks cephalad nail migration; removing screws too early in a Type III–IV comminuted fracture risks shortening.
This paper is also why we watch for proud screw heads as a distinct clinical problem, separate from non-union. Trochanteric bursitis or snapping ITB at the nail entry site after femoral nailing should prompt you to examine screw prominence on imaging, not assume the fracture has failed.