Biomechanical analysis of various operative hip joint rotation center shifts

1993 ◽  
Vol 112 (3) ◽  
pp. 124-126 ◽  
Author(s):  
A. Iglič ◽  
V. Antolič ◽  
F. Srakar
Keyword(s):  
Hip Joint ◽  
Biomechanical Analysis ◽  
Joint Rotation ◽  
Rotation Center

scholarly journals Physiological Gait versus Gait in VR on Multidirectional Treadmill—Comparative Analysis

Medicina ◽  
2019 ◽  
Vol 55 (9) ◽  
pp. 517 ◽  
Author(s):  
Katarzyna Jochymczyk-Woźniak ◽  
Katarzyna Nowakowska ◽  
Jacek Polechoński ◽  
Sandra Sładczyk ◽  
Robert Michnik
Keyword(s):  
Comparative Analysis ◽  
Knee Joint ◽  
Hip Joint ◽  
Pelvic Tilt ◽  
Plantar Flexion ◽  
Center Of Mass ◽  
The Body ◽  
Joint Rotation ◽  
Active Motion ◽  
Flexion Extension

Background and objectives: Virtual reality (VR) is increasingly often finding applications in physiotherapy and health promotion. Recent years have seen the use of advanced technologies in the promotion of physical activity (PA) in society. New simulators, e.g., treadmills, enable the performance of PA (e.g., locomotive movements) in VR (artificially created virtual world). The question of how such movements are similar to natural forms of human locomotion (march, run) inspired the comparative analysis of physiological gait and gait in VR on a multidirectional Omni treadmill. Materials and Methods: The tests involved the use of the BTS Smart system for the triplanar analysis of motion. The test involved 10 healthy females aged 20–24 (weight: 52 ± 3.1 kg, height 162 ± 5.4 cm). Measurements were performed at two stages. The first stage involved the standard assessment of physiological gait, whereas the second was focused on gait forced by the Omni treadmill. The following gait parameters were analyzed: Flexion-extension in the ankle, knee joint and hip joint, rotation in the hip joint and knee joint, foot progression, adduction-abduction in the knee joint and hip joint, pelvic obliquity, pelvic tilt, pelvic rotation as well as energy expenditure and the movement of the body center of mass. Results: The analysis of the test results revealed the existence of differences in the kinematics of physical gait and gait on the treadmill. The greatest differences were recorded in relation to the dorsal-plantar flexion in the ankle, the foot progression, the rotation of the knee joint, pelvic tilt and rotation. In addition, the gait on the treadmill is characterized by the longer duration of the stance phase and reduced ranges of the following movements: Flexion-extension in the ankle, knee joint and hip joint, adduction-abduction in the hip joint as well as rotation in the ankle and hip joint. The values of potential, kinetic and total energy recorded in relation to forced gait are significantly lower than those of physiological gait. Conclusions: Because of the fact that the parameters of gait on the Omni platform vary significantly from the parameters of physical gait, the application of the Omni treadmill in the re-education of gait during rehabilitation should be treated with considerable care. Nonetheless, the treadmill has adequate potential to become a safe simulator enabling active motion in VR using locomotive movements.

Biomechanical analysis of dynamic parameters of three-point crutch gait in patients after unilateral endoprosthetic hip joint reconstruction

2014 ◽  
Vol 39 ◽  
pp. S38-S39 ◽  
Author(s):  
Michał Murawa ◽  
Lechosław B. Dworak ◽  
Małgorzata Syczewska ◽  
Jarosław Kabaciński ◽  
Agata Rzepnicka
Keyword(s):  
Hip Joint ◽  
Biomechanical Analysis ◽  
Dynamic Parameters ◽  
Joint Reconstruction

Biomechanical analysis of suture anchors and suture materials used for toggle pin stabilization of hip joint luxation in dogs

2001 ◽  
Vol 62 (5) ◽  
pp. 721-728 ◽  
Author(s):  
Wendy I. Baltzer ◽  
Kurt S. Schulz ◽  
Susan M. Stover ◽  
Ken T. Taylor ◽  
Philip H. Kass
Keyword(s):  
Hip Joint ◽  
Biomechanical Analysis ◽  
Suture Anchors ◽  
Suture Materials ◽  
Materials Used ◽  
Joint Luxation

The influence of hip joint rotation of a wearable robot on curving motion

2019 ◽  
Vol 2019 (0) ◽  
pp. 1A1-I08
Author(s):  
Yosuke KUBOKI ◽  
Yasuhiro AKIYAMA ◽  
Yoji YAMADA ◽  
Shogo OKAMOTO
Keyword(s):  
Hip Joint ◽  
Wearable Robot ◽  
Joint Rotation

scholarly journals Real-Time Estimation of Glenohumeral Joint Rotation Center With Cable-Driven Arm Exoskeleton (CAREX)—A Cable-Based Arm Exoskeleton

2013 ◽  
Vol 6 (1) ◽  
Author(s):  
Ying Mao ◽  
Xin Jin ◽  
Sunil K. Agrawal
Keyword(s):  
Real Time ◽  
Glenohumeral Joint ◽  
Kinematic Model ◽  
Estimation Method ◽  
Time Estimation ◽  
Estimation Algorithm ◽  
Joint Rotation ◽  
Rotation Center ◽  
Arm Rehabilitation ◽  
Novel Approach

In the past few years, the authors have proposed several prototypes of a Cable-driven upper ARm EXoskeleton (CAREX) for arm rehabilitation. One of the assumptions of CAREX was that the glenohumeral joint rotation center (GH-c) remains stationary in the inertial frame during motion, which leads to inaccuracy in the kinematic model and may hamper training performance. In this paper, we propose a novel approach to estimate GH-c using measurements of shoulder joint angles and cable lengths. This helps in locating the GH-c center appropriately within the kinematic model. As a result, more accurate kinematic model can be used to improve the training of human users. An estimation algorithm is presented to compute the GH-c in real-time. The algorithm was implemented on the latest prototype of CAREX. Simulations and preliminary experimental results are presented to validate the proposed GH-c estimation method.

Real-Time Estimation of Glenohumeral Joint Rotation Center With CAREX: A Cable-Based Arm Exoskeleton

2012 ◽  
Author(s):  
Ying Mao ◽  
Xin Jin ◽  
Sunil K. Agrawal
Keyword(s):  
Real Time ◽  
Healthy Subjects ◽  
Degrees Of Freedom ◽  
Glenohumeral Joint ◽  
Kinematic Model ◽  
Time Estimation ◽  
Estimation Algorithm ◽  
Experimental Results ◽  
Joint Rotation ◽  
Rotation Center

In the past few years, the authors have proposed several prototypes of a Cable-driven upper ARm EXoskeleton (CAREX) for arm rehabilitation. The key advantages of CAREX over conventional exoskeletons are: (i) It is nearly an order of magnitude lighter. (ii) It does not have conventional links and joints, hence does not require joint axes alignment and segment lengths adjustment. (iii) It does not limit the natural degrees-of-freedom of the upper limb. (iv) The structure of the exoskeleton is novel as the cables are routed from the proximal to the distal segments of the arm. Preliminary experimental results with CAREX on a robotic arm and on healthy subjects have demonstrated the effectiveness of the exoskeleton within “assist-as-needed” training paradigm. In this paper, we propose a novel approach to estimate the glenohumeral joint rotation center (GH-c) using measurements of shoulder joint angles and cable lengths. This helps in locating the glenohumeral joint rotation center appropriately within the kinematic model. As a result, more accurate kinematic model can be used to improve the training of human users. An estimation algorithm is presented to compute the GH-c in real-time. The algorithm was implemented on the latest prototype of CAREX which controls four degrees-of-freedom of the shoulder and elbow. Preliminary experiments were performed on two healthy subjects under two different scenarios: (i) GH-c was assumed to be a fixed point and (ii) GH-c was estimated using the proposed algorithm. Experimental results are presented to compare the two scenarios.

scholarly journals Clinical evaluation of hip joint rotation range of motion in adults

2012 ◽  
Vol 98 (1) ◽  
pp. 17-23 ◽  
Author(s):  
P. Kouyoumdjian ◽  
R. Coulomb ◽  
T. Sanchez ◽  
G. Asencio
Keyword(s):  
Range Of Motion ◽  
Clinical Evaluation ◽  
Hip Joint ◽  
Joint Rotation
Sign in / Sign up

Export Citation Format

Share Document