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ERBAL
- Space Physiology
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- Space Physiology
- Robotics
- Motion-Based Scaling of Infant Musculoskeletal Model for DDH TreatmentCollaboration between Embry-Riddle Aeronautical University and Centers of Biomedical Research Excellence (COBRE)Special thanks to the International Hip Dysplasia Institute for the support of this study.
Huayamave, Victor (1), Walck, Christine (1), Lim, Yeram (1), Mannen, Erin (2), Siddicky, Safeer (2)
1. Embry-Riddle Aeronautical University, USA
2. University of Arkansas for Medical Sciences, USA
Introduction
Developmental hip dysplasia (DDH) is the most common hip disorder found in infants and young children [1]. DDH represents an abnormal condition that ranges from mild to severe dislocation, which may be detrimental for proper bone morphology, and may cause the deformation of the femoral head and acetabulum. This disorder is the cause for up to 9% of all hip replacements and 29% of hip replacements in people aged 60 years or younger [1]. Early-stage DDH can be treated using the Pavlik harness (PH) by keeping the hips abducted and flexed to provide a closed reduction [2]. However, clinical studies have shown that the harness fails for severe dislocations. Although previous studies have quantified the biomechanics of PH treatment, these models did not consider active muscle response [3-5]. The purpose of this study is to create a musculoskeletal model of an infant through marker-based scaling to quantify the kinematic biomechanical response of an infant’s lower extremity to different treatment methods.
Methods
The test subject for this study was a 2.4-month-old infant, 56 cm tall, and weighing 5.35 kg. The subject was instrumented with reflective markers placed on the lower extremity and around the cranial to capture kinematic data using the VICON Nexus motion capture system.
The motion capture data was used to generate a musculoskeletal model via OpenSim. The generic GAIT 2392 model was scaled using marker-based scaling from the kinematic data recorded, and a preliminary musculoskeletal infant model was generated.
Results
Discussion
The kinematically scaled model was compared against knee flexion angle data from cyclic leg movements (kicking) in human infants [6]. Figure 2 shows good agreement between our segment length-scaled OpenSim infant model and existing literature. Future studies will include multiple subjects to obtain a larger sample for kinematic scaling. Kinetic data will also be included to improve the scaling of muscle parameters that will enable us to quantify joint moments, individual muscle forces, and internal contact forces during DDH treatment. Our infant model lays the foundation for a musculoskeletal framework that can potentially be used to appropriately quantify and understand movement control in infants.The research reported in this publication was supported by the National Institute Of General Medical Sciences of the National Institutes of Health under Award Number P20GM125503
References
1. Dezateux, C. and K. Rosendahl, Developmental dysplasia of the hip. The Lancet, 2007. 369(9572): p. 1541-1552.
2. Atalar, H., et al., Indicators of successful use of the Pavlik harness in infants with developmental dysplasia of the hip. International Orthopaedics, 2007. 31(2): p. 145-150.
3. Huayamave, V., et al., A patient-specific model of the biomechanics of hip reduction for neonatal Developmental Dysplasia of the Hip: Investigation of strategies for low to severe grades of Developmental Dysplasia of the Hip. Journal of Biomechanics, 2015. 48(10): p. 2026-2033.
4. Zwawi, M.A., et al., Developmental dysplasia of the hip: A computational biomechanical model of the path of least energy for closed reduction. Journal of Orthopaedic Research, 2016. 35(8): p. 1799-1805.
5. Huayamave, V., et al., Biomechanical evaluation of femoral anteversion in developmental dysplasia of the hip and potential implications for closed reduction. Clinical Biomechanics, 2020. 72: p. 179-185.
6. Schneider, K., et al., Understanding movement control in infants through the analysis of limb intersegmental dynamics. journal of Motor Behavior, 1990. 22(4): p. 493-520.
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