Repeatability of Pressure Force During Elbow Flexion and Extension Before and After Exercise

1. To gain a better understanding of the pathophysiology of hemiballismus in primates, and to test directly the hypothesis that the subthalamopallidal projection is excitatory, we studied the effects of lesions of the subthalamic nucleus (STN) on neuronal activity in the globus pallidus (GP) of monkeys during performance of a motor behavioral task. 2. Animals were trained to position and hold a manipulandum to which torque pulses were applied, producing elbow flexion and extension. The activity of neurons in the external (GPe) and internal (GPi) segments of GP was recorded in two monkeys during task performance before and after STN lesions. The STN was lesioned by the fiber-sparing neurotoxins ibotenic acid and/or kainic acid. 3. After lesioning, the firing rate of neurons in both segments of GP, which was measured during the period of holding before torque application, was significantly decreased in both animals. The mean of discharge rates of GPi neurons decreased (P < 0.001) from 69.8 (n = 169, SD = 21.6) to 47.4 spikes/s (n = 180, SD = 22.6) after lesioning. The mean of discharge rates of GPe neurons decreased from 63.6 spikes/s (n = 218, SD = 25.1) before lesions to 41.0 spikes/s (n = 208, SD = 18.1) after lesioning. 4. These results provide further evidence that STN gives rise to a major excitatory input to both segments of the GP and support the hypothesis that dyskinesias result from decreased GPi output.

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Learning Transfer from Flexion to Extension Movements: Importance of the Final Position

Motor Control ◽

10.1123/mcj.2.3.221 ◽

1998 ◽

Vol 2 (3) ◽

pp. 221-227 ◽

Cited By ~ 1

Author(s):

Dusko B. Ilic ◽

Dragan M. Mirkov ◽

Slobodan Jaric

Keyword(s):

Elbow Flexion ◽

Control Group ◽

Final Position ◽

Variable Error ◽

Before And After ◽

Movement Distance ◽

Level Of Significance ◽

Experimental Group ◽

Flexion And Extension

Nine subjects (experimental group) were tested on rapid elbow flexion and extension movements performed in the same final position, before and after extensive practice of the movements. Nine additional subjects (control group) were also tested, but without any practice between the tests. Comparison of the pretest and posttest results suggested that the experimental group decreased their variable error (i.e., standard deviation of the final movement position) in both practiced (elbow flexion) and nonpracticed (elbow extension) movements. The control group, however, did not improve in either of tested movements. The experimental group demonstrated lower variable error in the nonpracticed elbow extensions than the control group, while the same difference for practiced elbow flexion movements was slightly below the level of significance. The results support the importance of the final position in programming of rapid, self-terminated movements; however, they do not rule out the role of other kinetic and kinematic variables (such as movement distance).

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Modified Osteotomy for Treatment of Forearm Deformities (Masada IIb) in Hereditary Multiple Osteochondromas: A Retrospective Review

10.21203/rs.3.rs-830988/v1 ◽

2021 ◽

Author(s):

Ge Yan ◽

Guoxin Nan

Keyword(s):

Distraction Osteogenesis ◽

External Fixator ◽

Wrist Joint ◽

Elbow Flexion ◽

Wrist Flexion ◽

Ilizarov External Fixator ◽

Multiple Osteochondromas ◽

Before And After ◽

Ulnar Lengthening ◽

Flexion And Extension

Abstract Purpose: Approximately 30% of patients with hereditary multiple osteochondromas (HMO) have forearm deformity and dysfunction. The aim of this retrospective study was to review our experience with the surgical treatment of children with HMO and Masada IIb forearm deformities.Methods: Data of eight children treated for HMO Masada IIb forearm deformity at our hospital between 2015 and 2019 were collected from the hospital records and retrospectively reviewed. All patients underwent ulnar lengthening by distraction osteogenesis using either the Orthofix or Ilizarov external fixator. Range of movements at the elbow and wrist joints, and forearm supination/pronation, before and after the operation were recorded. Radiographs were evaluated by the Fogel method, and wrist joint function by the Krimmer method.Results: Follow-up radiographs showed significant improvement in relative ulnar shortening after treatment (pre-operative 9.23 ± 5.21 mm; post-operative 0.33 ± 4.13 mm). Changes in radial articular angle (pre-operative 33.55° ± 3.88° to 32.78° ± 6.57°) and carpal slip (pre-operative 45.00% ± 19.09%; post-operative 43.13% ± 16.68%) were not significant. Elbow flexion and extension, wrist flexion and extension, ulnar and radial deviation at wrist, and forearm rotation were significantly improved after surgery. Wrist function was graded as excellent in seven patients and as good in one patient. One patient treated with the Ilizarov external fixator had poor radial head reduction.Conclusion: Ulnar lengthening with distraction osteogenesis is an effective treatment for HMO Masada IIb deformities. The optimum site for ulnar osteotomy appears to be at the proximal one-third to one-fourth of the ulna.

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Modified osteotomy for treatment of forearm deformities (Masada IIb) in hereditary multiple osteochondromas: a retrospective review

BMC Musculoskeletal Disorders ◽

10.1186/s12891-021-04829-x ◽

2021 ◽

Vol 22 (1) ◽

Author(s):

Ge Yan ◽

Guoxin Nan

Keyword(s):

Distraction Osteogenesis ◽

External Fixator ◽

Wrist Joint ◽

Elbow Flexion ◽

Wrist Flexion ◽

Ilizarov External Fixator ◽

Multiple Osteochondromas ◽

Before And After ◽

Ulnar Lengthening ◽

Flexion And Extension

Abstract Purpose Approximately 30% of patients with hereditary multiple osteochondromas (HMO) have forearm deformity and dysfunction. The aim of this retrospective study was to review our experience with the surgical treatment of children with HMO and Masada IIb forearm deformities. Methods Data of eight children treated for HMO Masada IIb forearm deformity at our hospital between 2015 and 2019 were collected from the hospital records and retrospectively reviewed. All patients underwent ulnar lengthening by distraction osteogenesis using either the Orthofix or Ilizarov external fixator. Range of movements at the elbow and wrist joints, and forearm supination/pronation, before and after the operation were recorded. Radiographs were evaluated by the Fogel method, and wrist joint function by the Krimmer method. Results Follow-up radiographs showed significant improvement in relative ulnar shortening after treatment (pre-operative 9.23 ± 5.21 mm; post-operative 0.33 ± 4.13 mm). Changes in radial articular angle (pre-operative 33.55° ± 3.88° to 32.78° ± 6.57°) and carpal slip (pre-operative 45.00% ± 19.09%; post-operative 43.13% ± 16.68%) were not significant. Elbow flexion and extension, wrist flexion and extension, ulnar and radial deviation at wrist, and forearm rotation were significantly improved after surgery. Wrist function was graded as excellent in seven patients and as good in one patient. One patient treated with the Ilizarov external fixator had poor radial head reduction. Conclusion Ulnar lengthening with distraction osteogenesis is an effective treatment for HMO Masada IIb deformities. The optimum site for ulnar osteotomy appears to be at the proximal one-third to one-fourth of the ulna.

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Measurements of Tendon Movement Within the Bicipital Groove After Suprapectoral Intra-articular Biceps Tenodesis in a Cadaveric Model

Orthopaedic Journal of Sports Medicine ◽

10.1177/2325967120977538 ◽

2021 ◽

Vol 9 (1) ◽

pp. 232596712097753

Author(s):

Brian J. Kelly ◽

Alan W. Reynolds ◽

Patrick J. Schimoler ◽

Alexander Kharlamov ◽

Mark Carl Miller ◽

...

Keyword(s):

Biceps Tendon ◽

Full Range ◽

Elbow Flexion ◽

Biceps Tenodesis ◽

Bicipital Groove ◽

Biceps Tenotomy ◽

Flexion Extension ◽

Before And After ◽

Long Head ◽

Scapular Motion

Background: Lesions of the long head of the biceps can be successfully treated with biceps tenotomy or tenodesis when surgical management is elected. The advantage of a tenodesis is that it prevents the potential development of a cosmetic deformity or cramping muscle pain. Proponents of a subpectoral tenodesis believe that “groove pain” may remain a problem after suprapectoral tenodesis as a result of persistent motion of the tendon within the bicipital groove. Purpose/Hypothesis: To evaluate the motion of the biceps tendon within the bicipital groove before and after a suprapectoral intra-articular tenodesis. The hypothesis was that there would be minimal to no motion of the biceps tendon within the bicipital groove after tenodesis. Study Design: Controlled laboratory study. Methods: Six fresh-frozen cadaveric arms were dissected to expose the long head of the biceps tendon as well as the bicipital groove. Inclinometers and fiducials (optical markers) were used to measure the motions of the scapula, forearm, and biceps tendon through a full range of shoulder and elbow motions. A suprapectoral biceps tenodesis was then performed, and the motions were repeated. The motion of the biceps tendon was quantified as a function of scapular or forearm motion in each plane, both before and after the tenodesis. Results: There was minimal motion of the native biceps tendon during elbow flexion and extension but significant motion during all planes of scapular motion before tenodesis, with the most motion occurring during shoulder flexion-extension (20.73 ± 8.21 mm). The motion of the biceps tendon after tenodesis was significantly reduced during every plane of scapular motion compared with the native state ( P < .01 in all planes of motion), with a maximum motion of only 1.57 mm. Conclusion: There was a statistically significant reduction in motion of the biceps tendon in all planes of scapular motion after the intra-articular biceps tenodesis. The motion of the biceps tendon within the bicipital groove was essentially eliminated after the suprapectoral biceps tenodesis. Clinical Relevance: This arthroscopic suprapectoral tenodesis technique can significantly reduce motion of the biceps tendon within the groove in this cadaveric study, possibly reducing the likelihood of groove pain in the clinical setting.

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A Pilot Study of Individual Muscle Force Prediction during Elbow Flexion and Extension in the Neurorehabilitation Field

Sensors ◽

10.3390/s16122018 ◽

2016 ◽

Vol 16 (12) ◽

pp. 2018 ◽

Cited By ~ 3

Author(s):

Jiateng Hou ◽

Yingfei Sun ◽

Lixin Sun ◽

Bingyu Pan ◽

Zhipei Huang ◽

...

Keyword(s):

Pilot Study ◽

Muscle Force ◽

Elbow Flexion ◽

Force Prediction ◽

Individual Muscle ◽

Flexion And Extension

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Design and Implement an Exoskeleton Arm for Reinforcement the Human Muscles after Stroke

Al-Nahrain Journal for Engineering Sciences ◽

10.29194/njes.22040252 ◽

2019 ◽

Vol 22 (4) ◽

pp. 252-258

Author(s):

Duha Qais Abd-ul-Amir ◽

Auns Qusai Hashim ◽

Abdulnasir Hussin Ameer

Keyword(s):

Stroke Rehabilitation ◽

Elbow Flexion ◽

Mobility Limitations ◽

Basic Principles ◽

Robotic Exoskeleton ◽

Human Muscles ◽

Negative Impacts ◽

Exoskeleton Device ◽

Flexion And Extension

Mobility limitations in stroke survivors yield negative impacts on the quality of life for such individuals. Rehabilitation is needed to help them recover and regain mobility. Accordingly, this study aims to design and validate a “Robotic Exoskeleton” intended for stroke rehabilitation. The basic principles of this robotic exoskeleton device are its dependence on electromyography signal and electronic microcontroller to provide an efficient physiotherapy exercises system.The robotic exoskeleton is a one degree of freedom which performs the flexion and extension of the elbow joint. After the design was completed, 19 subjects participated in this study: 4 healthy subjects, and 15 post-stroke patients.The results showed the benefit of robotic exoskeleton in increasing the elbow range of motion, where angle of elbow flexion was raised from the first physiotherapy session to maximum elbow flexion in the last session.

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Discharge Patterns of Coxal Levator and Depressor Motoneurones of the Cockroach, Periplaneta Americana

Journal of Experimental Biology ◽

10.1242/jeb.52.1.139 ◽

1970 ◽

Vol 52 (1) ◽

pp. 139-165

Author(s):

K. G. PEARSON ◽

J. F. ILES

Keyword(s):

Peripheral Nerves ◽

Sensory Input ◽

Periplaneta Americana ◽

Motor Axon ◽

Extracellular Recordings ◽

Before And After ◽

Collateral Pathways ◽

Discharge Patterns ◽

Flexion And Extension ◽

Leg Movements

1. Observation of movements of the metathoracic legs of the cockroach before and after section of peripheral nerves allowed identification of muscles involved in flexion and extension of the femur. 2. Extracellular recordings from the nerves to these coxal muscles show that during rhythmic leg movements bursts of activity in a number of levator motor axons were strongly reciprocal and generally non-overlapping with those of a slow depressor motor axon. 3. These reciprocal patterns persisted after removal of all sensory input from the legs. 4. The durations of levator bursts were relatively constant compared to those of the depressor, corresponding to the behavioural observations on leg protraction time. The pattern was asymmetric: levator bursts could be generated without depressor activity, but never the reverse. 5. No evidence was found for inhibitory collateral pathways between antagonist motoneurones. 6. It is proposed that levator motoneurones are driven by a group of bursting interneurones which simultaneously inhibit the ongoing depressor activity.

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