Clinical biomechanics
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Clinical biomechanics · Mar 2005
Comparative Study Clinical TrialRelationship between the thickness and hemodynamics of the erector spinae muscles in various lumbar curvatures.
There is little information about the relationship between the changes of hemodynamics and the morphologic changes of the erector spinae muscle. ⋯ The erector spinae muscles' thickness, tissue blood volume, and its oxygenation are simultaneously increased during relaxed extension and decreased during relaxed flexion, as shown by non-invasive near-infrared spectroscopy and ultrasonography. Changes in hemodynamics and morphology of the erector spinae muscles in asymptomatic subjects are given for further research on the pathomechanism of back pain.
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Clinical biomechanics · Jan 2005
Comparative StudyA biomechanical study comparing cortical onlay allograft struts and plates in the treatment of periprosthetic femoral fractures.
Periprosthetic femoral fractures with well-fixed femoral components can be difficult to manage and internal fixation is usually necessary. This study was designed to determine the effect of cable plate, strut allograft and combined plate and strut allograft fixations of periprosthetic femoral fractures. ⋯ The best fracture fixation was achieved with the combined plate and strut graft constructs particularly in combination with the two unicortical screws above the fracture. The plate only constructs may not provide sufficient fixation stability in rotation for the simulated transverse fracture. The within-construct interfragmentary motions were not significantly different except for the plate only constructs. This suggests that the fixation construct type is the determining factor of interfragmentary motion.
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Clinical biomechanics · Jan 2005
Clinical TrialModifying center of mass trajectory during sit-to-stand tasks redistributes the mechanical demand across the lower extremity joints.
Sit-to-stand tasks are commonly facilitated by modifying the initial position of the center of mass relative to the feet. It was hypothesized that modifications in the center of mass trajectory during sit-to-stand tasks altered the total body momentum at seat departure and redistributed the lower extremity net joint moments. ⋯ When changes in initial center of mass position are made, alteration in center of mass horizontal momentum and the orientation of the lower extremity segments relative to the reaction force are observed. Consequently, mechanical demand imposed on the ankle, knee, and hip joint is redistributed. The magnitude of the net joint moments is dependent on the segment orientation, the reaction force, and the adjacent net joint moment.
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Clinical biomechanics · Dec 2004
Comparative Study Clinical Trial Controlled Clinical TrialForce tracking system for the assessment of grip force control in patients with neuromuscular diseases.
The majority of hand functionality assessment methods consist of the maximal voluntary grip force measurement. Additional knowledge on sensory-motor control can be obtained by capturing functional grip force in a time frame. Tracking methods have been successfully used for the assessment of grip force control in stroke patients and patients with Parkinson's disease. ⋯ The current study investigated force control in patients with neuromuscular diseases where detection of small changes in motor performance is important when following the progress of disease. The presented evaluation method can provide additional information on muscle activation and fatigue as compared to traditional grip strength testing.
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Clinical biomechanics · Dec 2004
Randomized Controlled Trial Clinical TrialInfluence of gender on hip and knee mechanics during a randomly cued cutting maneuver.
To investigate gender differences in three-dimensional hip and knee joint mechanics in collegiate athletes during a randomly cued cutting maneuver. ⋯ Because it is known that females incur a greater number of anterior cruciate ligament injuries than males, it is of interest to identify gender differences in lower extremity mechanics when performing sport specific tasks. Understanding of these differences will contribute to the development of prevention training programs.