University of Twente Student Theses


Identification of riskful behaviour for ACL re-ruptures : considering the time continuous nature of kinematic hop test data

Warnaar, R.S.P. (2019) Identification of riskful behaviour for ACL re-ruptures : considering the time continuous nature of kinematic hop test data.

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Abstract:Introduction: The return to sport guidelines for patients who have had anterior cruciate ligament reconstruction (ACLR) might be improved by time series analysis of kinematic hop data to enhance the ability to identify patients that are at risk for a re-rupture. The first objective of this study was to identify time continuous kinematic features that explain a substantial part of the variation in hop test data in ACLR patients. The second objective was to examine whether these features are discriminating between ACLR patients that have had a re-rupture and those who had not. Methods: Single leg hop kinematics were acquired in 56 ACLR patients using eight Xsens inertial measurement units 12 months post-surgery. Functional principal component analysis (FPCA) was used to identify kinematic features in the knee and hip flexion curves that discriminated between re-rupture and no re-rupture. The data of the patients was divided over a training set, existing of a group of 6 patients with a re-rupture; a group of 17 without a re-rupture; and a group of 24 who did no complete 24 month follow-up yet, and a test set, existing of the remaining 9 patients without a re-rupture. FPCA was applied to the training set curves. The resulting principal components were fitted to the test set. Results: Smaller maximal knee flexion angles during landing were found for the patients with a re-rupture compared to the groups without a re-rupture. Moreover, the moment of maximal knee occurred later after initial contact. This behaviour was consistent across the training and test set. Conclusion: FPCA was used to identify predisposing behaviour for re-ruptures in ACLR patients. Stiffer landing mechanics in the re-rupture group were identified in accordance with the behaviour described in literature.
Item Type:Essay (Master)
Faculty:TNW: Science and Technology
Subject:44 medicine
Programme:Technical Medicine MSc (60033)
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