Early Weightbearing After Operatively Treated Ankle Fractures: A Biomechanical Analysis.

MedStar author(s):
Citation: Foot & Ankle International. 37(6):652-8, 2016 JunPMID: 26802427Institution: MedStar Union Memorial HospitalDepartment: Orthopaedic SurgeryForm of publication: Journal ArticleMedline article type(s): Journal ArticleSubject headings: *Ankle Injuries/su [Surgery] | *Ankle Joint/su [Surgery] | *Fracture Fixation, Internal/mt [Methods] | *Radiography/mt [Methods] | *Weight-Bearing/ph [Physiology] | Fracture Fixation, Internal/st [Standards] | Humans | Postoperative PeriodYear: 2016Local holdings: Available online from MWHC library: 1999 - present, Available in print through MWHC library: 1999 - 2006ISSN:
  • 1071-1007
Name of journal: Foot & ankle internationalAbstract: BACKGROUND: 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.CLINICAL RELEVANCE: This study supports further investigation of early weightbearing postoperative protocols after fixation of unstable ankle fractures. Copyright (c) The Author(s) 2016.CONCLUSION: No significant fracture displacement, no hardware failure, and no new fractures occurred in a cadaveric model of early weightbearing in unstable ankle fracture after open reduction and internal fixation.METHODS: 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.RESULTS: 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 92.3%) occurred in the first 50 000 cycles. There was no correlation between fracture displacement and bone mineral density.All authors: Hasenboehler EA, Paez AG, Parks BG, Schon LC, Sirisreetreerux N, Tan EWFiscal year: FY2016Digital Object Identifier: Date added to catalog: 2017-08-22
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Item type Current library Collection Call number Status Date due Barcode
Journal Article MedStar Authors Catalog Article 26802427 Available 26802427

Available online from MWHC library: 1999 - present, Available in print through MWHC library: 1999 - 2006

BACKGROUND: 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.

CLINICAL RELEVANCE: This study supports further investigation of early weightbearing postoperative protocols after fixation of unstable ankle fractures. Copyright (c) The Author(s) 2016.

CONCLUSION: No significant fracture displacement, no hardware failure, and no new fractures occurred in a cadaveric model of early weightbearing in unstable ankle fracture after open reduction and internal fixation.

METHODS: 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.

RESULTS: 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 92.3%) occurred in the first 50 000 cycles. There was no correlation between fracture displacement and bone mineral density.

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