Configuration design and correction ability evaluation of a novel external fixator for foot and ankle deformity treated by U osteotomy

Zuo, Shuguang; Dong, Mingjie; Li, Jianfeng; Tao, Chunjing; Ji, Run

doi:10.1007/s11517-019-02103-w

Cited by 11 publications

(8 citation statements)

References 47 publications

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“…However, the user can also enter the required number of days for the deformity correction within the appropriate range. It is worth noting that Zuo et al 48 proposed a novel parallel distraction apparatus for U osteotomy (PDA‐Uos) which considered the effect of redundant DOF on correction, and the performance indexes including adjustment accuracy for the evaluation of the correction ability of the external fixator were investigated. The adjustment accuracy of the external fixator along the predetermined correction trojectory directly determines the effect of distraction osteogenesis.…”

Section: Discussionmentioning

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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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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Section: Discussionmentioning

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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“…Different external fixator configurations are possible for the management of a deformity [ 85 ]. Selecting the most suitable assembly shape is an important and fundamental step before performing correction of deformity [ 86 ]. Introducing new external fixators to correct multiplane deformity would shorten the correction time and reduce the patient's pain [ 87 ].…”

Section: Introductionmentioning

confidence: 99%

“…Introducing new external fixators to correct multiplane deformity would shorten the correction time and reduce the patient's pain [ 87 ]. Conventional Ilizarov external fixator and hexapod fixator are two external fixators used in the management of foot and ankle deformities [ 86 ].…”

Section: Introductionmentioning

confidence: 99%

Use of external fixators in developing countries: a short socioeconomic analysis

Pathmanathan

Wijesinghe

Silva

2022

Cost Eff Resour Alloc

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The use of external fixators (EFs) dates back to 377 BC Hippocrates’ time, and it has a wide range of orthopaedic applications. External fixator has expanded its use in the management of fractures and other musculoskeletal conditions. It is widely used all over the world to manage complex musculoskeletal injuries. It has many advantages as compared to internal fixation in some trauma scenarios. However, the cost of the external fixators presents a dilemma to the healthcare system in developing countries. The goals of this review article are to explain the importance of EFs in developing countries in managing fractures, to determine the problems encountered at present during external fixation by developing countries, to identify solutions that could be used to address these issues, expand the use of external fixation into other domains of treatment, the impact of COVID-19 pandemic on fracture management based on existing literature. In conclusion, EFs are very expensive, researches have been conducted to overcome these barriers in developing countries. However, there are limitations in implementing in developing countries. It is important to have affordable and clinically acceptable EFs available in developing countries.

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“…The range of motion (ROM) is a crucial indicator to assess the correction capability of the external fixator, which must have a sufficient ROM to accommodate the correction requirement of different indications; otherwise, the correction plan will not be carried out [16]. At present, clinicians evaluate the ROM of the external fixator only by investigating the individual displacement and angle capabilities [11,12], instead of investigating the ROM from a three-dimensional perspective.…”

Section: Introductionmentioning

confidence: 99%

“…The mechanical diagram of the external fixator. The external fixator consists of (1) proximal ring, (2) distal ring, (3) Hooke joint, (4) spherical hinge, (5) telescopic rod, (6) DC) servo motor,(7) incremental encoder, (8) Kirschner wire, (9) the holder of the telescopic rod, (10) rolling bearing mounted on the screw nut, (11) lead screw, (12) gear reduction, (13) mark number of rod, (14) motor bracket,(15) rolling bearing mounted on the spherical joint,(16) bracket of the spherical joint,(17) bush bearing, (18) end cap,(19) linkage shaft of the Hooke joint.…”

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confidence: 99%

Development and Preliminary Trajectory Verification of the Electromotor-Driven Parallel External Fixator for Deformity Correction

Dong

et al. 2020

Applied Sciences

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External fixators are widely used in deformity correction based on distraction osteogenesis. Traditionally, the rods are manually operated by patients several times a day, which will ensure the patient’s compliance, accumulative adjustment error, and trajectory deviation. To reduce the patients’ compliance and the complexity of adjustment, an electromotor-driven parallel external fixator is developed to gradually correct the deformity, which allows the fixator to be automatically adjusted and can correct any three-dimensional deformity with continuous stability. Two adjustment strategies are proposed through different trajectory control methods based on the inverse kinematics solution, and the trajectory and bone shape are generated to investigate the characteristics of the new bone more intuitively. The range of motion is performed utilizing the numerical searching method to assess the fixator’s correction capability. Finally, the trajectory verification experiment is carried out using the artificial bone model to perform the two adjustment strategies. The results show that the developed external fixator has high correction accuracy with 0.0172 mm, and can accurately and safely realize the preset correction trajectory. The developed fixator system can also be used as a teaching tool for medical training for clinicians to learn deformity correction technology.

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Configuration design and correction ability evaluation of a novel external fixator for foot and ankle deformity treated by U osteotomy

Cited by 11 publications

References 47 publications

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

Use of external fixators in developing countries: a short socioeconomic analysis

Development and Preliminary Trajectory Verification of the Electromotor-Driven Parallel External Fixator for Deformity Correction

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