Sagittal placement of the femoral component in total knee arthroplasty predicts knee flexion contracture at one-year follow-up |
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Authors: | Sebastien Lustig Corey J Scholes Tim J Stegeman Sam Oussedik Myles R J Coolican David A Parker |
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Institution: | Sydney Orthopaedic Research Institute, Suite 12, Level 1, 445 Victoria Avenue, Chatswood, NSW, Australia, 2067, sebastien.lustig@gmail.com. |
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Abstract: | PurposeFlexion contracture has been shown to impair function and reduce satisfaction following total knee arthroplasty (TKA). The aim of this study was to identify modifiable intra-operative variables that predict post-TKA knee extension.MethodsData was collected prospectively on 95 patients undergoing total knee arthroplasty, including pre-operative assessment, intra-operative computer assisted surgery (CAS) measurements and functional outcome including range of motion at one year. Patients were divided into two groups: those with mild flexion contracture (> 5°) at the one-year follow-up and those achieving full extension.ResultsThe sagittal orientation of the distal femoral cut differed significantly between groups at the one-year follow-up (p?=?0.014). Sagittal alignment of greater than 3.5° from the mechanical axis was shown to increase the relative risk of a mild flexion contracture at one-year follow-up by 2.9 times, independent of other variables.ConclusionIncreasing the sagittal alignment of the distal femoral cut more than 3.5° from the mechanical axis is an independent risk factor for clinically detectable flexion contracture one year from index procedure. |
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