Assessing Finger Joint Biomechanics by Applying Equal Force to Flexor Tendons In Vitro Using a Novel Simultaneous Approach

Yang, Tai-Hua; Lu, Szu-Ching; Lin, Wei-Jr; Zhao, Kristin D.; Zhao, Chunfeng; An, Kai-Nan; Jou, I‐Ming; Lee, Pei-Yuan; Kuo, Li-Chieh; Su, Fong Chin

doi:10.1371/journal.pone.0160301

Cited by 19 publications

(12 citation statements)

References 50 publications

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“…The maximum flexion force at the DP segment was approximately 7.4 N (Fig. 7 (A)), which is larger than the minimum force for full flexion of finger joints (7 N, [30]). Therefore, only Model 2 has the potential of assisting a full thumb flexion.…”

Section: ) Comparison Among 3c-actsmentioning

confidence: 78%

Designing Soft Pneumatic Actuators for Thumb Movements

Wang

Kokubu

Zhou

et al. 2021

IEEE Robot. Autom. Lett.

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Studies have developed various types of soft robotic gloves for hand rehabilitation in recent years. Most soft actuators achieved a sufficient thumb flexion assist while lacking opposition support, which requires the coordination of thumb flexion and abduction-adduction. The difficulties for thumb support lie in the intrinsic complexity of thumb movements and spatial restriction of the hand. To realize multiple degrees of freedom of the thumb and make effective use of the limited space of the hand's dorsal side, we optimized and compared two approaches for thumb support. The combination approach used two independent soft actuators for thumb flexion and abduction-adduction support, respectively. The all-in-one approach used one single soft actuator to assist motions in different directions. We designed the soft actuators for each approach based on the thumb's biomechanical characteristics and evaluated their thumb flexion, abduction support performance in terms of the range of motion (RoM) and force output, and the opposition support performance using an enhanced Kapandji test. The results showed a larger abduction RoM and force output of the composition approach and a higher Kapandji score of the all-in-one approach, indicating that the two approaches might be applicable for thumb support but have the advantage in different rehabilitation stages.

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Section: ) Comparison Among 3c-actsmentioning

confidence: 78%

Designing Soft Pneumatic Actuators for Thumb Movements

Wang

Kokubu

Zhou

et al. 2021

IEEE Robot. Autom. Lett.

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“…These studies all reported on loading forces during flexion. Loading forces on each joint in full flexion in the study by Yang et al ranged from 1.69 to 7.93 N [25]. The forces in the study by Kursa et al [27] ranged from 1.3 to 4 N in FDP tendons and 1.3-8.5 N in FDS tendons, and Edsfeldt et al [28] reported forces of up to 13 N. Although the lock constraints may have meant that the model in our study has under-predicted the highest values for force, the results for the healthy FDP observed a trend which appears consistent with the maximum force values reported in the literature.…”

Section: Discussionmentioning

confidence: 92%

“…There is agreement in the literature that tension in the FDP tendon is greater than that in the FDS tendon for healthy fingers [25,27]. More specifically, in a study by Lu et al, tension generated during passive extension modelling was estimated in the FDP tendon as 1.41 to 22.93 N compared to 0.78 to 11.97 N in the FDS tendon [23].…”

Section: Discussionmentioning

confidence: 92%

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A Finite Element Model for Trigger Finger

2020

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The aim of this study was to develop a finite element model to investigate the forces on tendons which ensue due to trigger finger. The model was used to simulate both flexor and extensor tendons within the index finger; two test cases were defined, simulating a “mildly” and “severely” affected tendon by applying constraints. The finger was simulated in three different directions: extension, abduction and hyper-extension. There was increased tension during hyper-extension, with tension in the mildly affected tendon increasing from 1.54 to 2.67 N. Furthermore, there was a consistent relationship between force and displacement, with a substantial change in the gradient of the force when the constraints of the condition were applied for all movements. The intention of this study is that the simulation framework is used to enable the in silico development of novel prosthetic devices to aid with treatment of trigger finger, given that, currently, the non-surgical first line of treatment is a splint.

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“…The content of collagen in the tendon, especially type I collagen, is related to the biomechanical property of repaired tendon. The tendon must be completely healed through collagen fiber deposition, molding, and maturation[ 31 , 32 ]. This study proved that the order of fibroblasts and collagen fibers in the amniotic tendon group was significantly better than that in the control group at the 2nd week after operation.…”

Section: Discussionmentioning

confidence: 99%

Experimental study of tendon sheath repair via decellularized amnion to prevent tendon adhesion

Liu

Bai

et al. 2018

PLoS ONE

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The adhesion of tendon and surrounding tissue is the most common complication after repairing an injured tendon. The injured flexor tendons in zone II are frequently accompanied by tendon sheath defects, which lead to poor recovery. A variety of biological and non-biological materials have been recently used for repair or as substitute for tendon sheaths to prevent tendon adhesion. However, non-biological materials, such as polyethylene films, have been used to prevent tendon adhesions by mechanical isolation. The possibility of tendon necrosis and permanent foreign body remains due to the lack of permeability and the obstruction of nutrient infiltration. The natural macromolecule amniotic membrane derived from organisms is a semi-permeable membrane with the following characteristics: smooth; without vascular, nerve, and lymphatic; and rich in matrix, cytokines, enzymes, and other active ingredients. The unique structure of this membrane makes it an ideal biomaterial. In the experiment in Henry chicken, the model of tendon sheath defect and the flexor digitorum tendon in zone II was established and randomly divided into control group, medical membrane group, and decellularized amniotic membrane group. Samples were obtained at the 2nd, 4th, 8th, and 12th week after operation. General, histological, and biomechanical tests were performed to investigate the preventive effect of repaired tendon sheath by decallularized amniotic membrane. Experimental results showed the following: the amniotic membrane group and the medical membrane group had mild inflammatory reaction and tissue edema, and nearly no adhesion was observed in the surrounding tissue; the fibroblast-like cells were distributed in layers under the light microscope; the amniotic membrane group was denser than the medical membrane group cells, and numerous fibroblasts were disorganized in the control group. Biomechanical measurements showed that the sliding distance of tendon, the total flexion angle of the toes, and the tendon maximum tensile breaking strength at the early postoperative were significantly better than in the control group. Through this experiment, the amniotic membrane, as a natural biological substitute material in the construction of tendon sheath, can effectively inhibit exogenous healing and promote endogenous healing to prevent tendon adhesion.

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Assessing Finger Joint Biomechanics by Applying Equal Force to Flexor Tendons In Vitro Using a Novel Simultaneous Approach

Cited by 19 publications

References 50 publications

Designing Soft Pneumatic Actuators for Thumb Movements

Designing Soft Pneumatic Actuators for Thumb Movements

A Finite Element Model for Trigger Finger

Experimental study of tendon sheath repair via decellularized amnion to prevent tendon adhesion

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