Repeatability Analysis of the OrthoTrak 3D Multi- Segment Foot Model: Kinematic Analysis

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1 212 AOFAS Annual Summer Meeting Repeatability Analysis of the OrthoTrak 3D Multi- Segment Foot Model: Kinematic Analysis Dong Yeon Lee, MD, Sang Gyo Seo, MD, Kyoung Min Lee, MD, Hey Sun Park, MS, and In Ho Choi, MD Dept. of Orthopedic Surgery, Seoul National University Hospital, Seoul, Korea

2 Repeatability Analysis of the OrthoTrak 3D Multi- Segment Foot Model: Kinematic Analysis Dong Yeon Lee, MD, Sang Gyo Seo, MD, Kyoung Min Lee, MD, Hey Sun Park, MS, and In Ho Choi, MD My disclosure is in the Final AOFAS Program Book. I have no potential conflicts with this presentation.

3 3D Multi-Segment Foot Models To measure in vivo foot kinematics Increasing evidences for published models Name of Model Methodological Study Clinical Study Milwaukee Foot Model Kidder et al. (1996), Meyer et al. (24) Oxford Foot Model Carson et al. (21) Heidelberg Foot Measurement Method Model by Leardini Model by Jenkyn Simon et al. (26) Leardini et al. (27) Deschamps et al. (212) Jenkyn & Nicol (27, 29) Khazzam et al. (27) for RA Canseco K et al. (28) for Hallux rigidus Thelologis et al. (23) for Clubfoot Turner et al. (26, 28) for RA Wolf et al. (28) for Footwear OrthoTrak Foot3D (-)

4 OrthoTrak Foot3D Model OrthoTrak Software (Motion Analysis Co., Santa Rosa, CA) 6 segments: Lower leg, Hindfoot, Lateral forefoot, Medial forefoot, Whole forefoot, Hallux 1 markers on foot & ankle

5 Materials & Methods Twenty volunteers (Korean) 1 males & 1 females 3 strides from 5 separate trials Retest at interval of 4 weeks 12 cameras, 3D optical motion capture system (Motion Analysis Co., Santa Rosa. CA) Eva Real-Time software (EVaRT, Motion Analysis Co.) Demographic Features Age Weight Height BMI SMD Foot length Foot width Average (Range) 28.9 yrs (2~35) 66.5 kg (44.9 ~ 15.5) cm (154.3 ~ 181.5) 23.3 kg/m 2 (16.8 ~ 32.2) 86. cm (76.7 ~ 96) 24.5 cm (21.5 ~ 26.9) 9.7 cm (8.6 ~11.)

6 Results Similar range & pattern between session 4 3 Dorsiflexti on Flex/Extension 1 Varus HalluxRotation 1 Int Foot Progression Hallux Hindfoot 2 1 Dorsiflexti on Flex/Extension Supinated Pro/Supination 2 1 Internal HindFoot Rotaion Arch Arch Height Arch Length Arch Index st visit(n=2) 2nd visit(n=2)

7 Results Similar range & pattern between session 1 Dorsiflexti on Flex/Extension 2 Supinated Pro/Supination 1 Adduction ForeFoot Rotation Forefoot Medial Forefoot 1-1 Dorsiflexti on Flex/Extension 2 1 Supinated Pro/Supination 1-1 Adduction ForeFoot Rotation Lateral Forefoot 1 Dorsiflexti on Flex/Extension Supinated Pro/Supination 1-1 Adduction ForeFoot Rotation st visit(n=2) 2nd visit(n=2)

8 Results High inter-trial & Inter-session repeatability, especially in sagittal plane motion Inter-trial Inter-session CMC ICC ICC Hallux Flex/Ext Hallux Rotation HindFoot Flex/Ext Hindfoot Pro/Sup Hindfoot Rotation ArchHeight ArchLength ArchIndex ForeFoot Flex/Ext ForeFoot Pro/Sup ForeFoot Rotation MedForeFoot Flex/Ext MedForeFoot Pro/Sup MedForeFoot Rotation LatForeFoot Flex/Ext LatForeFoot Pro/Sup LatForeFoot Rotation Inter-trial repeatability (CMC) Excellent Very good Good Moderate

9 Summary Inter-trial & inter-session repeatability of OrthoTrak Foot3D Multi-Segment Foot Model is comparable to that of previously reported 3D MFMs. OrthoTrak Foot3D MFM can be used for objective foot measurement in gait analysis for both research and clinical applications. Case of Residual Clubfoot Pt. (s/p PMLR) Hallux Arch Hindfoot

10 References Carson MC et al. Kinematic analysis of a multi-segment foot model for research and clinical applications : a repeatability analysis. J Biomech. 21;34: Deschamps K et al. Repeatability in the assessment of multi-segment foot kinematics. Gait Posture. 212;35: Garofalo P et al. Interoperator reliability and prediction band of a novel protocol to measure the coordinated movements of shoulder-girdle and humerus in clinical settings Med Biol Eng Comput 29; 47: Motion Analysis. Foot3D Multi-Segment User s Manual version 1.1 Wright CJ et al. Repeatability of the modified Oxford foot model during gait in healthy adults. Gait Posture. 211;33:

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