Early Weightbearing After Operatively Treated Ankle Fractures: A Biomechanical Analysis

Foot & Ankle International
Eric W TanErik A Hasenboehler

Abstract

No consensus exists regarding the timing of weightbearing after surgical fixation of unstable traumatic ankle fractures. We evaluated fracture displacement and timing of displacement with simulated early weightbearing in a cadaveric model. Twenty-four fresh-frozen lower extremities were assigned to Group 1, bimalleolar ankle fracture (n=6); Group 2, trimalleolar ankle fracture with unfixed small posterior malleolar fracture (n=9); or Group 3, trimalleolar ankle fracture with fixed large posterior malleolar fracture (n=9) and tested with axial compressive load at 3 Hz from 0 to 1000 N for 250 000 cycles to simulate 5 weeks of full weightbearing. Displacement was measured by differential variable reluctance transducer. The average motion at all fracture sites in all groups was significantly less than 1 mm (P < .05). Group 1 displacement of the lateral and medial malleolus fracture was 0.1±0.1 mm and 0.4±0.4 mm, respectively. Group 2 displacement of the lateral, medial, and posterior malleolar fracture was 0.6±0.4 mm, 0.5±0.4 mm, and 0.5±0.6 mm, respectively. Group 3 displacement of the lateral, medial, and posterior malleolar fracture was 0.1±0.1 mm, 0.5±0.7 mm, and 0.5±0.4 mm, respectively. The majority of displacement (64.0% to...Continue Reading

References

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Citations

Dec 29, 2016·Foot & Ankle Specialist·Kempland C WalleyJohn Y Kwon
Aug 8, 2019·Foot & Ankle International·Chan KangGi-Soo Lee
Sep 27, 2018·European Journal of Trauma and Emergency Surgery : Official Publication of the European Trauma Society·Diederik Pieter Johan SmeeingFalco Hietbrink
Nov 3, 2017·The Bone & Joint Journal·M C Solan, A Sakellariou
Nov 21, 2020·The Journal of Foot and Ankle Surgery : Official Publication of the American College of Foot and Ankle Surgeons·Brian P CunninghamFernando A Pena
Oct 13, 2020·Injury·Peter AugatChristian von Rüden

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