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Results 451 - 500 of 1150
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Grinyagin I V - - 2005
We analyzed the adaptability of human thumb and index finger movement kinematics and dynamics to variations of precision grip aperture and movement velocity. Six subjects performed precision grip opening and closing movements under different conditions of movement velocity and movement aperture (thumb and index finger tip-to-tip distance). Angular motion of ...
Dounskaia Natalia N Department of Kinesiology, Arizona State University, P.O. Box 870404, Tempe, AZ 85287-0404, USA. - - 2005
Impairments in control of multi-joint arm movements in Parkinson's Disease (PD) were investigated. The PD patients and age-matched elderly participants performed cyclical arm movements, tracking templates of a large circle and four differentially oriented ovals on a horizontal table. The wrist was immobilized and the movements were performed with shoulder ...
Holmberg Hans-Christer - - 2005
PURPOSE: To further the understanding of double poling (DP) through biomechanical analysis of upper and lower body movements during DP in cross-country (XC) skiing at racing speed. METHODS: Eleven elite XC skiers performed DP at 85% of their maximal DP velocity (V85%) during roller skiing at 1 degrees inclination on ...
Brown Lee E - - 2005
The purpose of this study was to investigate the movement speed characteristics of 2 intrinsically different limbs. Twenty subjects volunteered to participate (10 men and 10 women). Each subject performed 5 repetitions of concentric knee and elbow extension and flexion movements at 60 through 500 d.s(-1) on an isokinetic dynamometer. ...
Shelburne Kevin B - - 2005
PURPOSE: The purpose of this investigation was to determine whether an isolated change in either quadriceps or hamstrings muscle force (quadriceps avoidance and hamstrings facilitation, respectively) is sufficient to stabilize the ACL-deficient (ACLd) knee during gait. METHODS: A three-dimensional model of the lower limb was used to calculate anterior tibial ...
Amadio Peter C PC Mayo Clinic College of Medicine, Rochester, Minnesota, USA. - - 2005
Finger flexor tendon rehabilitation has come a long way, but further advances are possible. Ideally, a healing tendon should move, but under the minimum load necessary to achieve motion. It is possible to design suture repairs that minimize the friction between tendon and sheath while simultaneously maintaining adequate strength to ...
Gibbs Peter T - - 2005
BACKGROUND: The practice of continuous, long-term monitoring of human joint motion is one that finds many applications, especially in the medical and rehabilitation fields. There is a lack of acceptable devices available to perform such measurements in the field in a reliable and non-intrusive way over a long period of ...
Karnezis Ioannis A - - 2005
BACKGROUND: Based on the phenomenon of bone adaptation to mechanical stimuli (Wolff's law) this study investigates a previously unreported correlation between the maximum wrist joint reaction force and the volar tilt angle of the distal radius. METHODS: Free body analysis of the sagittal-plane forces acting on the supinated distal radius ...
Saari Tuuli - - 2005
We studied the kinematics of the knee during weight-bearing active extension in 14 patients with medial osteoarthrosis (OA) and in 10 controls using dynamic radiostereometry. Between 50 degrees and 20 degrees of extension the OA knees showed decreased internal tibial rotation corresponding to less posterior displacement of the lateral femoral ...
Woodburn James - - 2005
OBJECTIVE: To compare the 3-dimensional (3D) orientation of the tibiotalar, tibiocalcaneal, and intertarsal joints in cadaveric specimens following structural weakening to predetermined ligaments in the peritalar region and medial ankle tendons under axial loads and simulated calcaneal valgus deformity. METHODS: Eight fresh-frozen, unembalmed human lower leg and foot specimens were ...
Ying Ning - - 2005
The dual Euler angles method has been proposed as an alternative approach to describe the general spatial human joint motion. In this study, the dual Euler angles method was applied to study the three-dimensional motion of the ankle complex. The methodology for obtaining dual Euler angles of the ankle complex ...
Dumontier Timothy A TA Mission Mountain Bone & Joint, 126 6th Street SW, Suite B, Ronan, Montana 59864. - - 2005
Evans showed that lengthening the lateral column by inserting structural bone graft into the anterior calcaneus could correct abduction and valgus deformity in flatfoot. To better understand the mechanism of correction and the three-dimensional effect of this procedure a cadaver study was done. Three cadaver flatfoot models were used. Computed ...
Leardini Alberto - - 2005
When using optoelectronic stereophotogrammetry, skin deformation and displacement causes marker movement with respect to the underlying bone. This movement represents an artifact, which affects the estimation of the skeletal system kinematics, and is regarded as the most critical source of error in human movement analysis. A comprehensive review of the ...
Ward Samuel R - - 2005
The purpose of this study was to compare the knee extensor mechanics in persons with and without patella alta. Thirteen subjects with patella alta and 14 subjects with normal patellar position participated in the study. Sagittal and axial MR images of the knee were acquired at 0 degrees , 20 ...
Wong Yueshuen - - 2005
The objective of this study is to validate previous descriptions of hindfoot kinematics using dual Euler angle methods in a passive cadaveric model. The dual Euler angle method was chosen so as to facilitate description of the translational and rotational movement occurring at both the ankle and subtalar joints. A ...
Requejo Philip S - - 2005
A three-dimensional (3D) biomechanical model was developed to determine upper extremity kinematics and kinetics of persons walking with forearm crutches. Six-component load cells and strain gauges were installed in the crutches to determine crutch forces. A six-camera VICON motion system was used to acquire coordinate data from 24 reflective markers ...
Kim Yongchul Y Department of Mechanical Engineering, Pohang University of Science and Technology, Pohang, South - - 2005
We identified torque response of flexion reflex associated with hip angle and angular velocity in 6 subjects with chronic SCI and developed two dimensional dynamic model with three segments, thigh, shank and foot. Influences of stimulation parameters such as amplitude, frequency and duration time of pulse train for producing swing ...
Laprade Judi - - 2005
The aims of this study were to determine whether patellofemoral kinematics in the anteroposterior (AP), mediolateral (ML) and proximal-distal (PD) directions could be measured in real time with high repeatability using a three-dimensional magnetic tracking system, and to evaluate the symmetry between sides. Data was collected from both knees of ...
Schurman David J DJ Department of Orthopaedic Surgery, Stanford University Medical Center, Stanford, CA 94305, USA. - - 2005
Range of motion after total knee arthroplasty is an important variable in determining clinical outcome. The goal of this study was to assess range of motion across five types of posterior-stabilized knee prostheses used sequentially in the same institution during 17 years. The hypothesis was that absolute flexion would improve ...
Shields Richard K - - 2005
OBJECTIVE: To estimate the processing time and neuromuscular delay required to extract and process sensory information from the ankle in order to coordinate an upper extremity movement sequence. METHODS: Nineteen able-bodied subjects were tested on their ability to perform a motor task that involved extension of their left index finger ...
Zhang Xudong - - 2005
This article reports a systematic research effort aimed at establishing a normative database of thumb circumduction range of motion (ROM) and related kinematic characteristics in vivo while examining the effects of anthropometry, gender, and direction of rotation. Twenty-eight (14 men, 14 women) anthropometrically diverse participants performed maximum voluntary thumb circumductions ...
Li Guoan - - 2005
BACKGROUND: Quantifying the in vivo cartilage contact mechanics of the knee may improve our understanding of the mechanisms of joint degeneration and may therefore improve the surgical repair of the joint after injury. OBJECTIVE: To measure tibiofemoral articular cartilage contact kinematics during in vivo knee flexion. STUDY DESIGN: Descriptive laboratory ...
McDonald Michael F - - 2005
Contracture, or loss of range of motion (ROM) of a joint, is a common clinical problem in individuals with spinal cord injury (SCI). In order to measure the possible contribution of changes in muscle length to the loss of ankle ROM, the active force vs. angle curves for the tibialis ...
Selles Ruud W - - 2004
OBJECTIVE: To establish the adaptation strategy transtibial amputees use after mass perturbation of their prosthetic lower leg. DESIGN: We investigated whether the measured adaptations to mass perturbation of the lower leg in transtibial amputees can better be described as (1) a kinetic invariance strategy in which kinetics (joint torques) remain ...
Rowe Sung Man - - 2004
BACKGROUND: Theoretically, the motion of a bipolar hip prosthesis is most likely to occur at the inner joint if the frictional coefficients are equal at both surfaces. However, many studies have suggested that most motion occurs at the outer joint. MATERIAL AND METHODS: We performed an analysis of motion in ...
Clayton H M - - 2004
REASONS FOR PERFORMING STUDY: Descriptions of 3D kinematics assist in understanding joint function and dysfunction, and are an essential step toward 3D inverse dynamic analysis. OBJECTIVES: To measure 3D carpal joint motion during trotting. METHODS: Three-dimensional trajectories of bone-fixed markers on the radius and third metacarpus of the right forelimb ...
Reid Duncan A - - 2004
Periodic or long-term stretching programs have demonstrated changes in joint range of motion. The suggested mechanisms for these increases in range of motion are changes in the tissue properties of the muscle and more recently stretch tolerance. However, few studies have examined changes in passive resistive forces and related these ...
Lee Hsin-Min - - 2004
The objective of this study is to develop a portable device for quantifying the velocity-dependent properties of spastic elbow muscles. Based on a motor-driven system, validation tests of the portable system such as accuracy and response of sensors were first examined. Furthermore, simulated modules (inertia, damper and spring) as well ...
Wu Wen-Lan - - 2004
The rocker sole and solid-ankle cushion-heel (SACH) heels are the most commonly prescribed external shoe modification. Only a limited number of scientific evidence exists to support these interventions in clinical practice. The objective of this study was to determine the effects of rocker soles and SACH heels on kinematics during ...
Corazza Federico - - 2005
The knowledge of the contact areas at the tibiotalar articulating surfaces during passive flexion is fundamental for the understanding of ankle joint mobility. Traditional contact area reports are limited by the invasive measuring techniques used and by the complicated loading conditions applied. In the present study, passive flexion tests were ...
Frey M - - 2004
Numerous publications provide measured biomechanical data relating to synovial joints. However, in general, they do not reflect the non-linear elastic joint properties in detail or do not consider all degrees of freedom (DOF), or the quantity of data is sparse. To perform more comprehensive, extended measurements of elastic joint properties, ...
Watanabe Tetsu - - 2004
The current study aimed to analyze kinematics during deep knee bending motion by subjects with fully congruent mobile-bearing total knee arthroplasties allowing axial rotation and anteroposterior (AP) gliding. Twelve subjects were implanted with Dual Bearing Knee prostheses (DBK, slot type: Finsbury Orthopaedics, Surrey, UK). These implants include a mobile-bearing insert ...
Michelson James J Orthopaedic Surgery, George Washington School of Medicine, 900 23rd Street, N.W., Room 6200, Washington, D.C. 2003, USA. - - 2004
Injuries to the medial and lateral ankle ligaments have been implicated in subtalar joint instability. Lateral injury increased subtalar joint varus and anterior translation, while deltoid injury increased external rotation and valgus in studies using static, non-physiologic testing. The current study employed a physiologically accurate ankle model using phasic force-couples ...
Degeorges R - - 2005
Longitudinal axial rotations of phalanges during flexion motions of digits have scarcely been analyzed with current anatomical or radiological methods. Recent optoelectronic systems were developed for three-dimensional (3D) kinematic analysis of human motion. These systems have the advantages of being non-invasive and non-irradiating. The current study was based on the ...
Shin Gwanseob - - 2004
In many occupational settings (e.g. agriculture and construction) workers are asked to maintain static flexed postures of the low back for extended periods of time. Recent research indicates that the resulting strain in the viscoelastic, ligamentous tissues may have a deleterious effect on the stability of the spine and the ...
Rogers J P - - 2004
The golf swing is a biomechanically complex movement requiring three-dimensional movements at the ankle joint complex (AJC), the hips and shoulders. Trans-tibial amputees lose the natural AJC movements as many prostheses do not allow three dimensional foot movements. Torsion devices have been developed and incorporated into prostheses to facilitate internal ...
Mannel Henrich - - 2004
This study establishes a functional knee-joint coordinate system (FCS) derived from active motion. The scale invariant properties of helical axes were used in order to avoid inter-observer errors associated with the traditional anatomical referencing techniques. The algorithm was tested with six cadaveric specimens in a knee-joint motion and loading apparatus. ...
Coetzee J Chris - - 2004
There is no standardized method reported in the literature to measure ROM of the ankle after a total ankle arthroplasty, which limits the possibility to compare results from the various ankle designs. It seems that most of the measurements are a combination of ankle and midfoot motion, not the tibiotalar ...
Dyrby Chris O - - 2004
The objective of this study was to test the hypothesis that during a weight bearing activity such as walking, a dynamic range (envelope of motion) exists in the relationship between the secondary knee motions (anterior-posterior (AP) translation, internal-external (IE) rotation, and abduction-adduction (Ab-Adduction)) and knee flexion angle. In addition differences ...
Jindrich Devin L - - 2004
OBJECTIVE: To examine the effects of postural and keyswitch characteristics on musculoskeletal tissue loading during tapping on computer keyswitches. DESIGN: We hypothesized that joint torques, stiffness and work parameters differ across keyswitch designs and finger postures typical of those observed during computer keyboard typing. We experimentally measured joint kinematics and ...
Tsepis Elias - - 2004
The torque-time curve patterns of concentric isokinetic knee extension in anterior cruciate ligament (ACL) deficient patients usually present mid-range irregularities associated with the level of anterior tibial translation. The purpose of this study was to compare the smoothness in isokinetic torque production between the ACL deficient and the healthy knee. ...
Zavatsky Amy B - - 2004
This study involved the development and testing of a system for the simultaneous in vitro measurement of tibiofemoral kinematics and patellofemoral kinematics and forces. Knee motion was tracked using a Vicon 370, and patellofemoral force was measured using a six degree-of-freedom transducer based on the design of Singerman et al. ...
van Hedel Hubertus J - - 2004
OBJECTIVE: To determine whether fixation of the ankle joint, the knee joint, or both increasingly affects the performance of a newly learned task, that is, stepping over an obstacle. DESIGN: Randomized trial. SETTING: Research laboratory of a university hospital in Switzerland. PARTICIPANTS: Eighteen healthy, young volunteers. INTERVENTION: Subjects walked on ...
Song Hongsun - - 2004
BACKGROUND: Although muscle strain injury models are frequently employed, highly invasive procedures, including surgical intervention, are typically used to produce these models. In this study, a minimally invasive model of acute strain injury was produced with a single eccentric contraction. HYPOTHESIS: The authors tested whether the severity of strain injury ...
Saikko Vesa - - 2004
Prosthetic joints appear to show a strong relationship between the type of relative motion and wear, requiring careful consideration in the design of wear simulators. This relationship was studied with a 12-station pin-on-disk device, specifically adapted for the wear simulation of prosthetic hip joints. Each station had a unique motion, ...
Taylor William R - - 2004
Surgical intervention of the knee joint routinely endeavors to recreate a physiologically normal joint loading environment. The loading conditions resulting from osteotomies, fracture treatment, ligament replacements, and arthroplasties of the knee are considered to have an impact on the long term clinical outcome; however, knowledge regarding in vivo loading conditions ...
Finley Margaret A - - 2004
We used an instrumented wheelchair ergometer and 3D motion analysis system to collect joint kinematic and temporal data, as well as hand rim and joint kinetics, in 47 manual wheelchair users (MWCUs) (15 with upper-limb impairment and 32 without upper-limb impairment). The group with upper-limb impairment propelled with a higher ...
Arndt Anton A Karolinska Institute, Department of Orthopedic Surgery, Karolinska University Hospital/Huddinge, Stockholm, Sweden. - - 2004
The absence of external landmarks on the talus has rendered the description of ankle and subtalar joint kinematics difficult. Abnormal motion at these joints has, however, been implied in the etiology of an array of lower extremity overuse injuries. Intracortical pins were inserted under local anesthesia in the tibia, talus, ...
Sonenblum S E - - 2004
It has previously been shown that the articulation of the scaphotrapezio-trapezoidal (STT) joint can be modeled such that the trapezoid and trapezium are tightly linked and move together on a single path relative to the scaphoid during all directions of wrist motion. The simplicity of such a model is fascinating, ...
Derrick Timothy R - - 2004
This article will summarize findings from several studies that together allow: 1) the examination of the effect that knee contact angle has on the severity of the resulting impact, 2) examination of the relationship between vertical ground reaction impact forces and leg impact accelerations, and 3) exploration of the adaptations ...
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