A New Parallel External Fixator Design for Correcting Ankle and Foot Sagittal Plane Deformities1

Sun, Mengqian; Wang, Shuai; Li, Bing; Song, Zhendong; Hu, Ying

doi:10.1115/1.4033738

Cited by 6 publications

(6 citation statements)

References 1 publication

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“…When performing the angular correction in the coronal plane, the input variables can be expressed as Equation (14).…”

Section: Trajectory Generation For Equal Joint Adjustmentmentioning

confidence: 99%

“…In recent years, some researchers have carried out related researches on external fixators with few DOFs. The literature 14 proposed a novel 3‐DOF parallel external fixator based on the analysis of the DOF requirements for the correction of the ankle deformity in sagittal plane, and the kinematic analysis was given. The literature 15 proposed a 2‐DOF parallel external fixator for the correction of clubfoot deformity based on the principle of Charles motion spiral, which has the advantages of simple structure and small number of adjustment joints.…”

Section: Introductionmentioning

confidence: 99%

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Comparison of three different correction trajectories for foot and ankle deformity treated by supramalleolar osteotomy using a novel external fixator

Dong

et al. 2020

Numer Methods Biomed Eng

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Based on the principle of distraction osteogenesis, external fixators are widely used in deformity correction of the foot and ankle. In this study, a novel ankle external fixator is proposed to correct complex multiplane deformities, especially for supramalleolar osteotomy to correct distal tibia deformities. The relatively simple structure and fewer struts in the proposed fixator reduce the complexity of adjusting the external fixator. Based on two existing adjustment strategies, a new strategy taking into account the orientation and shortest path of the ankle joint center is proposed, which is named joint adjustment for equal bone distraction. By proposing the inverse kinematic solutions of the novel external fixator, mathematical derivations of the bone trajectory and modelling of the bone shape for the three distraction strategies are performed. The results obtained by comparative analysis indicate that a uniformly spaced path of the ankle joint center can be acquired, and a smooth and uniform correction trajectory of the distal tibia end can be obtained using the new adjustment strategy. It can avoid bone end interference and only generates a maximum deviation 0.66% greater than the currently optimal 1 mm/day. The new strategy can perform multiplane corrections simultaneously, which shortens the correction time and reduces the patient's pain.

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“…When performing the angular correction in the coronal plane, the input variables can be expressed as Equation (14).…”

Section: Trajectory Generation For Equal Joint Adjustmentmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Comparison of three different correction trajectories for foot and ankle deformity treated by supramalleolar osteotomy using a novel external fixator

Dong

et al. 2020

Numer Methods Biomed Eng

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“…In other words, the actual DOF required for this deformity correction is 3. Sun et al 22 suggested that it is necessary to simplify the HEF when focusing on bone deformities with one or two angulation deformities. To solve this problem, screw theory was used to obtain the new configuration of an adjustable parallel external fixator with an improved structure.…”

Section: Introductionmentioning

confidence: 99%

“…In other words, the actual DOF required for this deformity correction is 3. Sun et al 22 . suggested that it is necessary to simplify the HEF when focusing on bone deformities with one or two angulation deformities.…”

Section: Introductionmentioning

confidence: 99%

A 3‐DOF electromotor‐driven external fixator for foot and ankle deformity correction based on X‐ray digital measurement

Wang

Zuo

et al. 2023

Robotics Computer Surgery

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Background The use of external fixators to treat foot and ankle deformities remains a challenge in orthopedic surgery due to their diversity. We hope to improve the automation and accuracy of the correction process. Methods A three‐degree‐of‐freedom (3‐DOF) electromotor‐driven external fixator for uniplanar foot and ankle deformities was proposed. Computer‐assisted correction software was developed to help surgeons use digital technology to measure the required parameters from patients' X‐ray radiographs. The correction trajectory and the prescriptions were generated in the software based on the proposed correction strategy. Results Two clinical cases were simulated to verify the correction ability of the developed external fixator. The results showed that the angular and displacement deformities were well corrected. Conclusions The developed external fixator can accurately and automatically correct foot and ankle deformities with the help of computer‐assisted correction software, which significantly reduces the burden on surgeons and patients.

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“…2,3 It is used not only for stabilising the bone fragments in a fracture but also very convenient for the treatment of angular deformities and limb-length discrepancies. 4 Ring fixators have been the subject of many studies with regard to their usage for the treatment of specific pathologies, [5][6][7][8] their automation via supporting software 9,10 or increasing their durability. 11 Another advantage of ring fixators is that their geometry can be configured in many different ways providing flexibility in treatment.…”

mentioning

confidence: 99%

A new ring fixator system for automated bone fixation

Aydi(ı)n,

U(Ü)n

2024

Robotics Computer Surgery

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BackgroundIn the field of orthopaedics, external fixators are commonly employed for treating extremity fractures and deformities. Computer‐assisted systems offer a promising and less error‐prone treatment alternative to manual fixation by utilising a software to plan treatments based on radiological and clinical data. Nevertheless, existing computer‐assisted systems have limitations and constraints.MethodsThis work represents the culmination of a project aimed at developing a new automatised fixation system and a corresponding software to minimise human intervention and associated errors, and the developed system incorporates enhanced functionalities and has fewer constraints compared to existing systems.ResultsThe automatised fixation system and its graphical user interface (GUI) demonstrate promising results in terms of accuracy, efficiency, and reliability.ConclusionThe developed fixation system and its accompanying GUI represent an improvement in computer‐assisted fixation systems. Future research may focus on further refining the system and conducting clinical trials.

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A New Parallel External Fixator Design for Correcting Ankle and Foot Sagittal Plane Deformities1

Cited by 6 publications

References 1 publication

Comparison of three different correction trajectories for foot and ankle deformity treated by supramalleolar osteotomy using a novel external fixator

Comparison of three different correction trajectories for foot and ankle deformity treated by supramalleolar osteotomy using a novel external fixator

A 3‐DOF electromotor‐driven external fixator for foot and ankle deformity correction based on X‐ray digital measurement

A new ring fixator system for automated bone fixation

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