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Ling H, Balasubramanian R. A novel implantable mechanism-based tendon transfer surgery for adult acquired flatfoot deformity: Evaluating feasibility in biomechanical simulation. PLoS One 2022; 17:e0270638. [PMID: 36166431 PMCID: PMC9514661 DOI: 10.1371/journal.pone.0270638] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/28/2020] [Accepted: 06/14/2022] [Indexed: 11/19/2022] Open
Abstract
Adult acquired flatfoot deformity becomes permanent with stage III posterior tibialis tendon dysfunction and results in foot pain and difficulty walking and balancing. To prevent progression to stage III posterior tibialis tendon dysfunction when conservative treatment fails, a flexor digitorum longus to posterior tibialis tendon transfer is often conducted. However, since the flexor digitorum longus only has one-third the force-capability of the posterior tibialis, an osteotomy is typically also required. We propose the use of a novel implantable mechanism to replace the direct attachment of the tendon transfer with a sliding pulley to amplify the force transferred from the donor flexor digitorum longus to the foot arch. In this work, we created four OpenSim models of an arched foot, a flatfoot, a flatfoot with traditional tendon transfer, and a flatfoot with implant-modified tendon transfer. Paired with these models, we developed a forward dynamic simulation of the stance phase of gait that reproduces the medial/lateral distribution of vertical ground reaction forces. The simulation couples the use of a fixed tibia, moving ground plane methodology with simultaneous activation of nine extrinsic lower limb muscles. The arched foot and flatfoot models produced vertical ground reaction forces with the characteristic double-peak profile of gait, and the medial/lateral distribution of these forces compared well with the literature. The flatfoot model with implant-modified tendon transfer produced a 94.2% restoration of the medial/lateral distribution of vertical ground reaction forces generated by our arched foot model, which also represents a 2.1X improvement upon our tendon transfer model. This result demonstrates the feasibility of a pulley-like implant to improve functional outcomes for surgical treatment of adult acquired flatfoot deformity with ideal biomechanics in simulation. The real-world efficacy and feasibility of such a device will require further exploration of factors such as surgical variability, soft tissue interactions and healing response.
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Affiliation(s)
- Hantao Ling
- School of Mechanical, Industrial, and Manufacturing Engineering, Oregon State University, Corvallis, Oregon, United States of America
- * E-mail:
| | - Ravi Balasubramanian
- School of Mechanical, Industrial, and Manufacturing Engineering, Oregon State University, Corvallis, Oregon, United States of America
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Li S, Luo X, Zhang S, Tang Y, Sun J, Meng Q, Yu H, Sun C. Evaluation of Multilevel Surgeries in Children With Spastic Cerebral Palsy Based on Surface Electromyography. Front Neurosci 2021; 15:680645. [PMID: 34335161 PMCID: PMC8319621 DOI: 10.3389/fnins.2021.680645] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/15/2021] [Accepted: 05/25/2021] [Indexed: 11/17/2022] Open
Abstract
The root mean square (RMS) of the surface electromyography (sEMG) signal can respond to neuromuscular function, which displays a positive correlation with muscle force and muscle tension under positive and passive conditions, respectively. The purpose of this study was to investigate the changes in muscle force and tension after multilevel surgical treatments, functional selective posterior rhizotomy (FSPR) and tibial anterior muscle transfer surgery, and evaluate their clinical effect in children with spastic cerebral palsy (SCP) during walking. Children with diplegia (n = 13) and hemiplegia (n = 3) with ages from 4 to 18 years participated in this study. They were requested to walk barefoot at a self-selected speed on a 15-m-long lane. The patient's joints' range of motion (ROM) and sEMG signal of six major muscles were assessed before and after the multilevel surgeries. The gait cycle was divided into seven phases, and muscle activation state can be divided into positive and passive conditions during gait cycle. For each phase, the RMS of the sEMG signal amplitude was calculated and also normalized by a linear envelope (10-ms running RMS window). The muscle tension of the gastrocnemius decreased significantly during the loading response, initial swing, and terminal swing (p < 0.05), which helped the knee joint to get the maximum extension when the heel is on the ground and made the heel land smoothly. The muscle force of the gastrocnemius increased significantly (p < 0.05) during the mid-stance, terminal stance, and pre-swing, which could generate the driving force for the human body to move forward. The muscle tension of the biceps femoris and semitendinosus decreased significantly (p < 0.05) during the terminal stance, pre-swing, and initial swing. The decreased muscle tension could relieve the burden of the knee flexion when the knee joint was passively flexed. At the terminal swing, the muscle force of the tibial anterior increased significantly (p < 0.05), which could improve the ankle dorsiflexion ability and prevent foot drop and push forward. Thus, the neuromuscular function of cerebral palsy during walking can be evaluated by the muscle activation state and the RMS of the sEMG signal, which showed that multilevel surgical treatments are feasible and effective to treat SCP.
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Affiliation(s)
- Sujiao Li
- Institute of Rehabilitation Engineering and Technology, School of Medical Device and Food Engineering, University of Shanghai for Science and Technology, Shanghai, China.,Shanghai Engineering Research Center of Assistive Devices, University of Shanghai for Science and Technology, Shanghai, China
| | - Xueqin Luo
- Institute of Rehabilitation Engineering and Technology, School of Medical Device and Food Engineering, University of Shanghai for Science and Technology, Shanghai, China.,Shanghai Engineering Research Center of Assistive Devices, University of Shanghai for Science and Technology, Shanghai, China
| | - Song Zhang
- Department of Functional Neurosurgery, Shanghai Punan Hospital, Shanghai Eber Medical Group, Shanghai, China.,Department of Pediatric Neurosurgery, Xinhua Hospital, Shanghai JiaoTong University School of Medicine, Shanghai, China
| | - Yuanmin Tang
- Institute of Rehabilitation Engineering and Technology, School of Medical Device and Food Engineering, University of Shanghai for Science and Technology, Shanghai, China.,Shanghai Engineering Research Center of Assistive Devices, University of Shanghai for Science and Technology, Shanghai, China
| | - Jiming Sun
- Department of Functional Neurosurgery, Shanghai Punan Hospital, Shanghai Eber Medical Group, Shanghai, China
| | - Qingyun Meng
- College of Rehabilitation Sciences, Shanghai University of Medicine and Health Sciences, Shanghai, China
| | - Hongliu Yu
- Institute of Rehabilitation Engineering and Technology, School of Medical Device and Food Engineering, University of Shanghai for Science and Technology, Shanghai, China.,Shanghai Engineering Research Center of Assistive Devices, University of Shanghai for Science and Technology, Shanghai, China
| | - Chengyan Sun
- Department of Functional Neurosurgery, Shanghai Punan Hospital, Shanghai Eber Medical Group, Shanghai, China
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Dygut J, Piwowar P, Detyna J, Popiela T, Kogut W, Boroń W, Dudek P, Piwowar M. Correction of foot deformities with hallux valgus by transversal arch restoration. Biocybern Biomed Eng 2020. [DOI: 10.1016/j.bbe.2020.09.006] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
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