Nicholas J Tucker1, Michael M Hadeed2, Cyril Mauffrey1,3, Joshua A Parry4,5. 1. Department of Orthopedics, Denver Health Medical Center, Denver Health, 777 Bannock St, MC 0188, Denver, CO, 80204, USA. 2. Department of Orthopaedic Surgery, University of Virginia School of Medicine, Charlottesville, VA, USA. 3. University of Colorado School of Medicine, Aurora, CO, USA. 4. Department of Orthopedics, Denver Health Medical Center, Denver Health, 777 Bannock St, MC 0188, Denver, CO, 80204, USA. joshua.alan.parry@gmail.com. 5. University of Colorado School of Medicine, Aurora, CO, USA. joshua.alan.parry@gmail.com.
Abstract
PURPOSE: To determine the effect of native tibia valga on intramedullary nail (IMN) fixation of tibial shaft fractures. METHODS: Retrospective comparative cohort analysis of 110 consecutive patients with tibial shaft fractures undergoing IMN fixation at an urban level one trauma centre was performed. Medical records and radiographs were reviewed for demographics, tibia centre of rotation of angulation (CORA), nail starting point, incidence of varus malreduction, and nail/canal proportional fit. RESULTS: Tibia valga (CORA of ≥ 3 degrees) was present in 37 (33.6%) patients. The anatomic nail starting point distance (in relation to the lateral tibial spine) was significantly greater in the tibia valga group (12.0 mm vs. 5.0 mm, mean difference: 7.1 mm, 95% CI: 5.8 to 8.3 mm, p < 0.0001). Varus malreduction was more common in the tibia valga group (10.8% vs. 1.4%, proportional difference: 9.4%, 95% CI: - 1.0 to 21.3%, p = 0.04). Varus malreduction in the tibia valga group was associated with a decreased nail width/inner canal width proportion on multivariate analysis (OR = 0.683, 95% CI: 0.468 to 0.995, p = 0.0004). CONCLUSION: Native tibia valga is common, and the use of a standard coronal IMN starting point with poor nail fit can lead to iatrogenic varus malreduction. In patients with tibia valga, maximizing nail fit or utilization of a medial starting point should be considered.
PURPOSE: To determine the effect of native tibia valga on intramedullary nail (IMN) fixation of tibial shaft fractures. METHODS: Retrospective comparative cohort analysis of 110 consecutive patients with tibial shaft fractures undergoing IMN fixation at an urban level one trauma centre was performed. Medical records and radiographs were reviewed for demographics, tibia centre of rotation of angulation (CORA), nail starting point, incidence of varus malreduction, and nail/canal proportional fit. RESULTS: Tibia valga (CORA of ≥ 3 degrees) was present in 37 (33.6%) patients. The anatomic nail starting point distance (in relation to the lateral tibial spine) was significantly greater in the tibia valga group (12.0 mm vs. 5.0 mm, mean difference: 7.1 mm, 95% CI: 5.8 to 8.3 mm, p < 0.0001). Varus malreduction was more common in the tibia valga group (10.8% vs. 1.4%, proportional difference: 9.4%, 95% CI: - 1.0 to 21.3%, p = 0.04). Varus malreduction in the tibia valga group was associated with a decreased nail width/inner canal width proportion on multivariate analysis (OR = 0.683, 95% CI: 0.468 to 0.995, p = 0.0004). CONCLUSION: Native tibia valga is common, and the use of a standard coronal IMN starting point with poor nail fit can lead to iatrogenic varus malreduction. In patients with tibia valga, maximizing nail fit or utilization of a medial starting point should be considered.
Authors: Jed I Maslow; Hayden L Joseph; Daniel Y Hong; Abigail L Henry; Phillip M Mitchell; Cory A Collinge Journal: J Am Acad Orthop Surg Date: 2020-09-15 Impact factor: 3.020
Authors: Ahmed Alghamdi; Michel Rahmé; Martin Lavigne; Vincent Massé; Pascal-André Vendittoli Journal: J Arthroplasty Date: 2014-03-06 Impact factor: 4.757