Print Email Facebook Twitter Video-Based Two-Dimensional Kinematic Analysis for the Evaluation of Lower Limb Function in Patellar Tendinopathy Title Video-Based Two-Dimensional Kinematic Analysis for the Evaluation of Lower Limb Function in Patellar Tendinopathy Author Molenaar, Mitchel (TU Delft Mechanical, Maritime and Materials Engineering) Contributor Harlaar, J. (mentor) Seth, A. (mentor) de Vos, R.J. (mentor) van Middelkoop, M. (mentor) Oei, E.H.G. (graduation committee) Degree granting institution Delft University of TechnologyUniversiteit LeidenErasmus Universiteit Rotterdam Programme Technical Medicine | Sensing and Stimulation Date 2020-08-31 Abstract Patellar tendinopathy (PT) is a common manifestation in jumping sports characterized by pain and a reduced load bearing capacity. The exact cause of PT has not been determined, which makes it difficult to prevent and treat. A stiffer landing technique might be a risk-factor for PT. Retraining of the landing technique into a less stiffer technique could be an important treatment for PT. Therefore, the aim of this study was to determine whether athletes with PT exhibit altered lower limb kinematics in the landing technique of a drop vertical jump test (DVJT) compared to asymptomatic athletes. DVJTs were performed by athletes diagnosed with PT and asymptomatic athletes. The DVJTs were recorded on video in the sagittal plane with a single camera in the Erasmus MC University Medical Center (Rotterdam, the Netherlands). A convolutional neural network was trained to extract coordinates of lower limb landmarks from the videos. The knee and ankle joint angles were calculated on the coordinates using least-squares. Functional Principal Component Analyses (FPCA) were performed to determine differences in lower limb kinematics between athletes with PT and asymptomatic athletes. In addition, the following kinematic features were compared between athletes with PT and asymptomatic athletes: angle at landing, maximal angle during landing, range of motion and time to maximal angle. Video-based 2D kinematic analysis of the landing DVJT was performed in 69 athletes with PT (53 men, mean age 24.6 ± 3.8 years) and 32 asymptomatic athletes (16 men, median age 20.5 (4) years). FPCA of knee (FPC1: p=0.5, FPC2: p=0.3) and ankle (FPC1: 0.7, FPC2: 0.1, FPC3: 0.5) joint angles did not show significant differences in the landing technique between these two groups. No significant differences were observed in angle at landing, maximal angle during landing, range of motion and time to maximal angle (knee: p=0.3, p=0.8, p=0.7, p=0.4; ankle: p=0.5, p=0.6, p=0.4, p=0.1). Athletes with PT do not have altered lower limb kinematics during the landing phase of a DVJT compared to asymptomatic athletes. These findings implicate that landing technique is not an important factor to address during rehabilitation of patients with PT. Subject Patellar tendinopathyVideo recordingDeep learningNeural NetworkLower extremityKinematicsHumansTreatmentPreventionRetraining To reference this document use: http://resolver.tudelft.nl/uuid:8e2ac04a-c88e-46a9-8a1f-e1f95b1d1e95 Embargo date 2021-08-31 Part of collection Student theses Document type master thesis Rights © 2020 Mitchel Molenaar Files PDF MSc_Thesis_MAMolenaar_Pat ... opathy.pdf 2.94 MB Close viewer /islandora/object/uuid:8e2ac04a-c88e-46a9-8a1f-e1f95b1d1e95/datastream/OBJ/view