scholarly journals What is the best lateral radiograph positioning technique for assessment of sagittal balance: A biomechanical study on influence of different arm positions

2018 ◽  
Vol 26 (2) ◽  
pp. 230949901877093 ◽  
Author(s):  
Koon-Man Sieh ◽  
Yue-Yan Chan ◽  
Po-Yan Ho ◽  
Kwai-Yau Fung
Keyword(s):  
Force Plate ◽  
Standing Position ◽  
Biomechanical Study ◽  
Lateral Radiograph ◽  
Sagittal Profile ◽  
Active Flexion ◽  
Shoulder Flexion ◽  
Gravity Line ◽  
Passive Flexion ◽  
Plate Analysis

Purpose: To evaluate the influence of different arm postures from the physiological standing position using force plate analysis of the gravity line. Methods: Forty healthy volunteered university students were enrolled. Each subject assumed different standing positions including standing with arms resting on the side (control), with fist over the clavicle (clavicular position), with active shoulder flexion in 30°, 60° and 90° with elbows extended (active flexion A), with hand rest on a bar with a static support (passive flexion P), and with hand rest on a bar with a drip stand (passive flexion D). The offset of the gravity line from the heel was measured by force plate analysis. The offset of the gravity line in different arm positions was compared with the control using paired t-test. Results: The mean anterior offset of the gravity line in control position is 39.80% of the foot length. All testing positions showed anterior shift of the gravity line compared with the control position from 0.51% to 7.50%. There were statistically significant changes of the gravity line from the control position in all ( p < 0.05), except in the clavicular position ( p = 0.249). Conclusion: All testing positions cause anterior shifting of the center of gravity from the physiological standing position. Clavicular position is the best comparable posture to the physiological standing position in taking a lateral radiograph. We recommend using the clavicular position as the standard testing position in the assessment of the sagittal profile.

Dual versus single force plate analysis of human drop jumping

2021 ◽  
Author(s):  
Stian Langgård Jørgensen ◽  
Jens Bojsen‐Møller ◽  
Thue Skalgard ◽  
Henrik B Olsen ◽  
Per Aagaard
Keyword(s):  
Force Plate ◽  
Dual Versus ◽  
Single Force ◽  
Plate Analysis

Shoulder joint hemiarthroplasty for treatment of a severe osteochondritis dissecans lesion in a dog

2014 ◽  
Vol 27 (03) ◽  
pp. 243-248 ◽  
Author(s):  
T. Sparrow ◽  
J. Meswania ◽  
G. Blunn ◽  
N. Fitzpatrick
Keyword(s):  
Osteochondritis Dissecans ◽  
Humeral Head ◽  
Shoulder Joint ◽  
Reaction Force ◽  
Force Plate ◽  
Shoulder Hemiarthroplasty ◽  
Gradual Improvement ◽  
Custom Made ◽  
Plate Analysis ◽  
Caudal Approach

SummaryIntroduction: Partial resurfacing of the humeral head has been reported in humans to treat humeral osteochondritis dissecans. The aim is to describe a custom-made humeral resurfacing prosthesis for treatment of severe humeral head osteochondritis dissecans in a dog.Case report: A seven-month-old female entire St. Bernard dog was presented with a 10 week history of severe left thoracic limb lameness. Radiography, arthroscopy and magnetic resonance imaging confirmed an extensive osteochondritis dissecans lesion affecting the caudal, medial and central regions of the humeral head. A prosthesis designed from computed tomography (CT) images was manufactured in polished stainless steel alloy with a hydroxyapatite coated base and central finned humeral stem for cementless insertion. A standard caudal approach to the shoulder was used to place the prosthesis following reaming of the caudal humeral head.Results: Radiography and CT imaging revealed appropriate topographical placement on the humerus. Force plate analysis demonstrated initial reduction in ground reaction force at six weeks, followed by gradual improvement at three months. There was no radiographic evidence of implant loosening and the range of shoulder joint motion was comparable to the contralateral joint at three months; these findings were maintained to final follow-up at 24 months.Clinical significance: Placement of a humeral head resurfacing prosthesis was an effective technique for the management of severe osteochondritis dissecans-related shoulder lameness. To the authors’ knowledge, this is the first report of the clinical use of shoulder hemiarthroplasty in a dog.

Instrumented Walkway for Estimation of the Ankle Impedance in Dorsiflexion-Plantarflexion and Inversion-Eversion During Standing and Walking

2015 ◽  
Author(s):  
Evandro M. Ficanha ◽  
Guilherme Ribeiro ◽  
Mohammad Rastgaar Aagaah
Keyword(s):  
Degrees Of Freedom ◽  
Force Plate ◽  
Mechanical Impedance ◽  
Standing Position ◽  
Camera System ◽  
Ankle Impedance ◽  
System A ◽  
Human Ankle ◽  
Applied Forces ◽  
And Inversion

This paper describes in detail the fabrication of an instrumented walkway for estimation of the ankle mechanical impedance in both dorsiflexion-plantarflexion (DP) and in inversion-eversion (IE) directions during walking in arbitrary directions and standing. The platform consists of two linear actuators, each capable of generating ±351.3 N peak force that are mechanically coupled to a force plate using Bowden cables. The applied forces cause the force plate to rotate in two degrees of freedom (DOF) and transfer torques to the human ankle to generate DP and IE rotations. The relative rotational motion of the foot with respect to the shin is recorded using a motion capture camera system while the forces applied to the foot are measured with the force plate, from which the torques applied to the ankle are calculated. The analytical methods required for the estimation of the ankle torques, rotations, and impedances are presented. To validate the system, a mockup with known stiffness was used, and it was shown that the developed system was capable of properly estimating the stiffness of the mockup in two DOF with less than 5% error. Also, a preliminary experiment with a human subject in standing position was performed, and the estimated quasi-static impedance of the ankle was estimated at 319 Nm/rad in DP and 119 Nm/rad in IE.

High-Resolution Force Plate Analysis of Utilized Slip Resistance in Human Walking

1996 ◽  
Vol 24 (6) ◽  
pp. 353 ◽  
Author(s):  
DR Petersen ◽  
RE Link ◽  
FL Buczek ◽  
SA Banks
Keyword(s):  
High Resolution ◽  
Force Plate ◽  
Human Walking ◽  
Slip Resistance ◽  
Plate Analysis

Assessment of tibiofemoral position in total knee arthroplasty using the active flexion lateral radiograph

The Knee ◽  
2010 ◽  
Vol 17 (1) ◽  
pp. 38-42 ◽  
Author(s):  
Michael S. Laidlaw ◽  
Lindsey R. Rolston ◽  
Kevin J. Bozic ◽  
Michael D. Ries
Keyword(s):  
Total Knee Arthroplasty ◽  
Knee Arthroplasty ◽  
Lateral Radiograph ◽  
Active Flexion ◽  
Total Knee

Running on an Incline

1992 ◽  
Vol 114 (4) ◽  
pp. 435-441 ◽  
Author(s):  
J. R. Iversen ◽  
T. A. McMahon
Keyword(s):  
Mathematical Model ◽  
Oxygen Consumption ◽  
Force Plate ◽  
Force Platform ◽  
Nonlinear Spring ◽  
Rate Of Oxygen Consumption ◽  
Foot Strike ◽  
Plate Analysis ◽  
Male Subjects ◽  
The Way

Seven male subjects ran at 3.0 m/s on a motorized treadmill including a force platform under the tread. The subjects ran at each of five treadmill inclinations: + 0.17, +0.077, 0, -0.077, and -0.17 radians. The position of the subjects’ legs were read from cine´ films (100 frames/s). Results of the film and force plate analysis generally corroborated the “hanging triangle” hypothesis, which postulates that the angle between the leg and the vertical upon foot strike does not change as the treadmill is tipped up or down. A mathematical model of running, in which the leg is represented as a nonlinear spring, made satisfactory predictions of the way many parameters of running change with the treadmill angle, including the length of the leg at touchdown and liftoff and the peak leg force in the middle of a step. The peak leg force reaches a maximum at a treadmill angle near −0.12 radians, close to the downhill angle where other authors have found a minimum in the rate of oxygen consumption.

Dual-Energy X-Ray Absorptiometry and Force-Plate Analysis of Gait in Dogs With Healed Femora After Leg-Lengthening Plate Fixation

1995 ◽  
Vol 24 (1) ◽  
pp. 15-24 ◽  
Author(s):  
PETER MUIR ◽  
MARK D. MARKEL ◽  
JOHN J. BOGDANSKE ◽  
KENNETH A. JOHNSON
Keyword(s):  
Plate Fixation ◽  
Force Plate ◽  
Dual Energy ◽  
Leg Lengthening ◽  
X Ray ◽  
Plate Analysis

scholarly journals Poster Session III, July 15th 2010 — Abstracts Sampling rate influence on vertical jump height in force plate analysis

2010 ◽  
Vol 2 (2) ◽  
pp. 3481
Author(s):  
Christian Baumgart ◽  
Volker Lange-Berlin ◽  
Rüdiger Hofmann ◽  
Jürgen Freiwald
Keyword(s):  
Poster Session ◽  
Vertical Jump ◽  
Sampling Rate ◽  
Force Plate ◽  
Jump Height ◽  
Vertical Jump Height ◽  
Plate Analysis

A Comparison of Surgical and Medical Treatment of Fragmented Coronoid Process and Osteochondritis Dissecans of the Canine Elbow

1995 ◽  
Vol 08 (04) ◽  
pp. 177-183 ◽  
Author(s):  
C. W. Miller ◽  
C. L. Taves ◽  
G. R. Bouck
Keyword(s):  
Medical Treatment ◽  
Osteochondritis Dissecans ◽  
Weight Bearing ◽  
Force Plate ◽  
Normal Weight ◽  
Coronoid Process ◽  
Radiographic Evaluation ◽  
Prospective Clinical Study ◽  
Plate Analysis

SummaryA randomized prospective clinical study was performed to compare the effect of surgery for fragmented coronoid process (FCP) and osteochondritis dissecans (OCD) of the canine elbow, with medical treatment using pentosan polysulphate (PPS). Nineteen dogs with FCP and/or OCD of the elbow were randomly assigned to either the surgical or medical group. Lameness examination, radiographic evaluation and force plate analysis were performed at the time of admission, and were repeated at two, four, six and nine months after treatment. In dogs with asymmetrical lameness, in both the medical and surgical groups, the peak vertical forces and mean vertical forces for the more affected limbs were significantly lower than the control means at time zero. In both the medical and surgical group, the peak and mean vertical forces improved during the course of the study. Weightbearing in medically treated dogs approached that in controls at a faster rate than in those treated surgically. After nine months of follow-up, differences could not be detected between the dogs treated surgically, and those treated with PPS.Surgical and medical treatment for fragmented coronoid process and osteochondritis dissecans of the canine elbow were compared. Medical treatment resulted in a more rapid return to normal weight-bearing than did surgical treatment. After nine months of follow-up, differences were not detected between the medically and surgically treated dogs.

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