Wearable Kinesthetic I/O Device for Sharing Wrist Joint Stiffness

2019 ◽  
Author(s):  
Jun Nishida ◽  
Keisuke Yagi ◽  
Modar Hassan ◽  
Kenji Suzuki
Keyword(s):  
Wrist Joint ◽  
Joint Stiffness

Evaluating the Ergonomic Benefit of a Wrist Brace on Wrist Posture, Muscle Activity, Rotational Stiffness, and Peak Shovel-Ground Impact Force During a Simulated Tree-Planting Task

2017 ◽  
Vol 59 (6) ◽  
pp. 911-924 ◽  
Author(s):  
Peter J. Sheahan ◽  
Joshua G. A. Cashaback ◽  
Steven L. Fischer
Keyword(s):  
Muscle Activity ◽  
Wrist Joint ◽  
Joint Stiffness ◽  
Tree Planting ◽  
Rotational Stiffness ◽  
Stiffness Analysis ◽  
Biologically Relevant ◽  
Flexion Extension ◽  
Ground Impact ◽  
Extension Axis

Background Tree planters are at a high risk for wrist injury due to awkward postures and high wrist loads experienced during each planting cycle, specifically at shovel-ground impact. Wrist joint stiffness provides a measure that integrates postural and loading information. Objective The purpose of this study was to evaluate wrist joint stiffness requirements at the instant of shovel-ground impact during tree planting and determine if a wrist brace could alter muscular contributions to wrist joint stiffness. Method Planters simulated tree planting with and without wearing a brace on their planting arm. Surface electromyography (sEMG) from six forearm muscles and wrist kinematics were collected and used to calculate muscular contributions to joint rotational stiffness about the wrist. Results Wrist joint stiffness increased with brace use, an unanticipated and negative consequence of wearing a brace. As a potential benefit, planters achieved a more neutrally oriented wrist angle about the flexion/extension axis, although a less neutral wrist angle about the ulnar/radial axis was observed. Muscle activity did not change between conditions. Conclusion The joint stiffness analysis, combining kinematic and sEMG information in a biologically relevant manner, revealed clear limitations with the interface between the brace grip and shovel handle that jeopardized the prophylactic benefits of the current brace design. This limitation was not as evident when considering kinematics and sEMG data independently. Application A neuromechanical model (joint rotational stiffness) enhanced our ability to evaluate the brace design relative to kinematic and sEMG parameter-based metrics alone.

Use of the Bridge Plate Technique for the Treatment of Hamatometacarpal Fracture-Dislocations

2020 ◽  
Vol 25 (01) ◽  
pp. 67-75 ◽  
Author(s):  
Hyoung-Seok Jung ◽  
Min Ku Song ◽  
Jae-Sung Lee
Keyword(s):  
Grip Strength ◽  
Wrist Joint ◽  
Joint Stiffness ◽  
Metacarpophalangeal Joint ◽  
Dash Score ◽  
Strength Data ◽  
Plate Technique ◽  
Bridge Plate ◽  
Fracture Dislocations ◽  
Quick Dash

Background: This study aimed to describe a novel surgical technique in which a bridge plate was used for the treatment of hamatometacarpal fracture-dislocations and to assess its radiologic and clinical outcomes. Methods: A retrospective review of 16 patients treated with the bridge plate technique for hamatometacarpal fracture-dislocations was performed between 2010 and 2015. Clinical and radiographic evaluations were performed at months 3, 6, and 12 postoperatively. Active wrist and metacarpophalangeal joint ranges of motion and Quick Disabilities of Arm, Shoulder, and Hand (DASH) scores were recorded for the injured hands. Grip strength data were collected for both the injured hands and the contralateral uninjured hands. Results: All patients included in our study were male (mean age 31 years). The average Quick DASH score was 24.3 ± 9.1 at 3 months, 12.3 ± 7.3 at 6 months, and 6.2 ± 6.6 at 12 months. All patients returned to their original jobs within 5 weeks of the procedure. Grip strength eventually recovered to 90% of that of the uninjured hand, and none of the patients complained of finger or wrist joint stiffness. Conclusions: The use of the bridge plate technique may be an effective alternative treatment for patients with comminuted hamatometacarpal fracture-dislocations.

scholarly journals Model-based analysis of the stiffness of the wrist joint in active and passive conditions

2018 ◽  
Author(s):  
Andrea Zonnino ◽  
Fabrizio Sergi
Keyword(s):  
Crucial Role ◽  
Muscle Activation ◽  
Wrist Joint ◽  
Joint Stiffness ◽  
Musculoskeletal Model ◽  
Experimental Measurements ◽  
Active Components ◽  
Muscle Groups ◽  
Biomechanical Constraints ◽  
Amount Of Knowledge

ABSTRACTThe control of joint stiffness is a fundamental mechanism used to control human movements. While many studies have observed how stiffness is controlled for tasks involving shoulder and elbow motion, a limited amount of knowledge is available for wrist movements, though the wrist plays a crucial role in fine manipulation.We have developed a computational framework based on a realistic musculoskeletal model, which allows to calculate the passive and active components of the wrist joint stiffness. We first used the framework to validate the musculoskeletal model against experimental measurements of the passive wrist joint stiffness, and then to study the contribution of different muscle groups on the passive joint stiffness. We finally used the framework to study the effect of muscle co - contraction on the active joint stiffness.The results show that thumb and finger muscles play a crucial role in determining the passive wrist joint stiff - ness: in the neutral posture, the direction of maximum stiffness aligns with the experimental measurements, and the magnitude increases by 113% when they are included. Moreover, the analysis of the controllability of joint stiffness showed that muscle co - contraction positively correlates with the stiffness magnitude and negatively correlates with the variability of the stiffness orientation (p < 0.01 in both cases). Finally, an exhaustive search showed that with appropriate selection of a muscle activation strategy, the joint stiffness orientation can be arbitrarily modulated. This observation suggests the absence of biomechanical constraints on the controllability of the orientation of the wrist joint stiffness.

Severe Destructive Tendinopathy in the Wrist Due to Dialysis-Related Amyloidosis

2017 ◽  
Vol 22 (03) ◽  
pp. 376-379 ◽  
Author(s):  
Dongmin Kim ◽  
In Cheul Choi ◽  
Jong Woong Park
Keyword(s):  
Soft Tissue ◽  
Soft Tissue Mass ◽  
Wrist Joint ◽  
Joint Stiffness ◽  
Surgical Excision ◽  
Tissue Mass ◽  
Palpable Mass ◽  
Extensor Tendons ◽  
Clinical Presentations

Dialysis-related amyloidosis (DRA) is a specific subtype of amyloidosis with several clinical presentations. Herein we report a case of severe destructive tendinopathy around the wrist associated with long-standing hemodialysis (HD). A 63-year-old female patient who had been on regular HD for 23 years suffered from symptoms of pain and a palpable mass around the wrist. Magnetic resonance imaging showed an ill-defined soft tissue mass around the extensor tendons that partially invaded the wrist joint. We performed surgical excision and tenolysis for the mass. The operative finding revealed an ill-defined yellowish soft tissue mass extensively invading the extensor tendons and wrist joint. The tendon fibers were severely fibrillated and showed impending rupture due to the infiltrated mass. Histological examination showed DRA. Amyloidosis-induced tendinopathy should be considered when a patient on long-term HD complains of an unusual mass-like lesion in the extremity and/or nonspecific joint stiffness. Early surgical intervention improves patient’s disability and decreases the risk of spontaneous tendon rupture.

scholarly journals Model-Based Analysis of the Stiffness of the Wrist Joint in Active and Passive Conditions

2019 ◽  
Vol 141 (4) ◽  
Author(s):  
Andrea Zonnino ◽  
Fabrizio Sergi
Keyword(s):  
Crucial Role ◽  
Muscle Activation ◽  
Wrist Joint ◽  
Joint Stiffness ◽  
Musculoskeletal Model ◽  
Experimental Measurements ◽  
Active Components ◽  
Muscle Groups ◽  
Biomechanical Constraints ◽  
Amount Of Knowledge

The control of joint stiffness is a fundamental mechanism used to control human movements. While many studies have observed how stiffness is modulated for tasks involving shoulder and elbow motion, a limited amount of knowledge is available for wrist movements, though the wrist plays a crucial role in manipulation. We have developed a computational framework based on a realistic musculoskeletal model, which allows one to calculate the passive and active components of the wrist joint stiffness. We first used the framework to validate the musculoskeletal model against experimental measurements of the wrist joint stiffness, and then to study the contribution of different muscle groups to the passive joint stiffness. We finally used the framework to study the effect of muscle cocontraction on the active joint stiffness. The results show that thumb and finger muscles play a crucial role in determining the passive wrist joint stiffness: in the neutral posture, the direction of maximum stiffness aligns with the experimental measurements, and the magnitude increases by 113% when they are included. Moreover, the analysis of the controllability of joint stiffness showed that muscle cocontraction positively correlates with the stiffness magnitude and negatively correlates with the variability of the stiffness orientation (p < 0.01 in both cases). Finally, an exhaustive search showed that with appropriate selection of a muscle activation strategy, the joint stiffness orientation can be arbitrarily modulated. This observation suggests the absence of biomechanical constraints on the controllability of the orientation of the wrist joint stiffness.

scholarly journals Early Shortening of Wrist Flexor Muscles Coincides With Poor Recovery After Stroke

2018 ◽  
Vol 32 (6-7) ◽  
pp. 645-654 ◽  
Author(s):  
Karin L. de Gooijer-van de Groep ◽  
Jurriaan H. de Groot ◽  
Hanneke van der Krogt ◽  
Erwin de Vlugt ◽  
J. Hans Arendzen ◽  
...  
Keyword(s):  
Time Course ◽  
Robot Manipulator ◽  
Wrist Joint ◽  
Joint Stiffness ◽  
Peripheral Tissue ◽  
Tissue Stiffness ◽  
Wrist Flexion ◽  
Poor Recovery ◽  
Flexor Muscles ◽  
Slack Length

Background. The mechanism and time course of increased wrist joint stiffness poststroke and clinically observed wrist flexion deformity is still not well understood. The components contributing to increased joint stiffness are of neural reflexive and peripheral tissue origin and quantified by reflexive torque and muscle slack length and stiffness coefficient parameters. Objective. To investigate the time course of the components contributing to wrist joint stiffness during the first 26 weeks poststroke in a group of patients, stratified by prognosis and functional recovery of the upper extremity. Methods. A total of 36 stroke patients were measured on 8 occasions within the first 26 weeks poststroke using ramp-and-hold rotations applied to the wrist joint by a robot manipulator. Neural reflexive and peripheral tissue components were estimated using an electromyography-driven antagonistic wrist model. Outcome was compared between groups cross-sectionally at 26 weeks poststroke and development over time was analyzed longitudinally. Results. At 26 weeks poststroke, patients with poor recovery (Action Research Arm Test [ARAT] ≤9 points) showed a higher predicted reflexive torque of the flexors ( P < .001) and reduced predicted slack length ( P < .001) indicating shortened muscles contributing to higher peripheral tissue stiffness ( P < .001), compared with patients with good recovery (ARAT ≥10 points). Significant differences in peripheral tissue stiffness between groups could be identified around weeks 4 and 5; for neural reflexive stiffness, this was the case around week 12. Conclusions. We found onset of peripheral tissue stiffness to precede neural reflexive stiffness. Temporal identification of components contributing to joint stiffness after stroke may prompt longitudinal interventional studies to further evaluate and eventually prevent these phenomena.

scholarly journals Functional and radiological outcome in distal radius fractures treated with locking compression plate

2017 ◽  
Vol 5 (2) ◽  
pp. 574
Author(s):  
Ashish N. Chavhan ◽  
Ulhas J. Dudhekar ◽  
Chandrashekhar M. Badole ◽  
Kiran N. Wandile
Keyword(s):  
Wrist Joint ◽  
Joint Stiffness ◽  
Good Method ◽  
External Fixators ◽  
Volar Plating ◽  
Radius Fractures ◽  
Ao Classification ◽  
Volar Approach ◽  
Mayo Score ◽  
Loss Of Reduction

Background: Fractures of distal end of radius are one of the most common skeletal injuries encountered in orthopaedics. There are various modalities for treatment like close reduction and cast application, external fixators, ORIF with plate etc. CR and cast application or K-wire fixation, external fixation is associated with immobilisation, wrist stiffness, loss of reduction postoperatively. So we performed volar plating for distal end radius fractures and calculated its results.Methods: We performed ORIF with plating (Volar approach) in 35 patients (22 male and 13 female) of distal end radius fractures depending on inclusion and exclusion criteria. Fractures were classified according to AO classification. All patients were operated under tourniquet. Results were analysed using Mayo score.Results: Out of 35 patients, 14 had type A, 16 had type B and 5 had type C fractures (AO classification). Average operative time was 45 minutes and blood loss of 50 ml. Average time to clinico-radiological union was 7 weeks. Average follow up time was 8 months. Average time to wrist mobilisation was 8 days. According to Mayo score, 16 patients had excellent results, 15 had well and 4 had satisfactory results.Conclusions: Volar plating for fracture distal end radius reduces chances of wrist joint stiffness and loss of reduction and good results can be obtained. So in our opinion, volar plating for treatment of fracture distal end radius is good method with excellent outcomes.

scholarly journals External fixation versus plating in intra-articular distal end radius fractures

2019 ◽  
Vol 5 (4) ◽  
pp. 680
Author(s):  
Shubham Anant ◽  
Saumya Agarwal ◽  
Sanjay Gupta ◽  
Anuj Kumar Lal
Keyword(s):  
External Fixation ◽  
External Fixator ◽  
Wrist Joint ◽  
Joint Stiffness ◽  
Delayed Union ◽  
Controlled Study ◽  
Point System ◽  
Radius Fractures ◽  
Better Than

<p class="abstract"><strong>Background:</strong> Distal end radius fractures are one of the most common encountered fractures in Orthopaedics. Prompt intervention in terms of volar locking plate or external fixation can be performed. The purpose of this study was to derive a better outcome as to which type of fixation is a better choice for the treatment of intra-articular distal end radius fracture.</p><p class="abstract"><strong>Methods:</strong> A prospective randomized controlled study was conducted with 30 patients and comparison was made between the plating and external fixator group using the modified clinical-scoring system of Green and O'Brien and demerit point system at each follow-up.<strong></strong></p><p class="abstract"><strong>Results:</strong> In the plating group 14 patient’s fracture united in 6th week and 1 patient’s fracture united at 8th week this result was similar to the external fixator group were 14 patient’s fracture united in 6th week and 1 patient’s fracture united at 8th week. 1 patient each developed wrist joint stiffness and delayed union in the plating group as compared to the external fixator group were 1 patient each developed wrist joint stiffness, delayed union and broken implant in situ and pin tract infection.</p><p class="abstract"><strong>Conclusions:</strong> During the initial follow ups the functional outcome of the plating group were better than the external fixator group but as the time passed at the final follow up plating was only marginally better than the external fixator group. It was seen that radiologically plating lead to a better correction of all the parameters as compared to external fixator group.</p>

Passive and active wrist joint stiffness following eccentric exercise

2000 ◽  
Vol 82 (5-6) ◽  
pp. 472-479 ◽  
Author(s):  
Andrew B. Leger ◽  
Theodore E. Milner
Keyword(s):  
Eccentric Exercise ◽  
Wrist Joint ◽  
Joint Stiffness
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