Clinical biomechanics
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Clinical biomechanics · Jul 2003
Comparative StudyMechanical performance of hybrid Ilizarov external fixator in comparison with Ilizarov circular external fixator.
The aim of this study was to determine the stiffness characteristics of the standard and hybrid Ilizarov fixators. ⋯ For optimum fixator stiffness in hybrid fixators, at least three femoral arches and four half-pins must be used. However, it should be remembered that, hybrid fixator models had less axial and bending stiffness than standard Ilizarov fixator model.
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Clinical biomechanics · Jun 2003
Comparative StudyMobile and fixed bearing total knee prosthesis functional comparison during stair climbing.
The purpose of this investigation is to determine the functional performance of the mobile bearing total knee replacement prosthesis as compared to the fixed bearing type total knee replacement prosthesis. ⋯ Total knee replacement patient with mobile bearing design can feel excessive femoro-tibial motion during daily living activities such as stair climbing and descending. Proprioceptive control of this tibio-femoral translation is needed as demonstrated by the lower limb compensatory mechanism. This data suggest that antero-posterior constraint structures (ligamentous or mechanical) are important to obtain reproducible knee kinematics.
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Clinical biomechanics · Mar 2003
Clinical Trial Controlled Clinical TrialJoint torques during sit-to-stand in healthy subjects and people with Parkinson's disease.
To compare lower limb joint torques during sit-to-stand in normal elderly subjects and people with Parkinson's disease, using a developed biomechanical model simulating all phases of sit-to-stand.Design. A cross-sectional study utilizing a Parkinsonian and a control group. ⋯ Slowness of sit-to-stand in people with Parkinson's disease could be due to a reduced hip flexion joint torque and a prolonged rate of torque production.
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Clinical biomechanics · Feb 2003
Comparative StudyStiffness characteristics and inter-fragmentary displacements with different hybrid external fixators.
To determine how the different approaches of constructing a hybrid external skeletal fixator affect the mechanical environment at the fracture site. ⋯ Understanding how the different approaches of constructing a hybrid fixator affect the mechanical environment at the fracture site will enable surgeons to chose or build the most appropriate fixator for each clinical situation.
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Clinical biomechanics · Jan 2003
Comparative Study Clinical TrialRasterstereographic back shape analysis in idiopathic scoliosis after anterior correction and fusion.
To determine the accuracy of rasterstereographic three-dimensional back surface analysis and reconstruction of the spine in cases of severe idiopathic scoliosis treated by anterior correction and fusion. ⋯ Accuracy in severe scoliosis up to 88 degrees Cobb angle was satisfactory. The results of this first evaluation of surgically treated severe scoliosis showed a good accuracy after anterior surgery. The system can be used for post-operative follow up examinations and may reduce the number of X-rays considerably. In contrast to radiography, CT or MRI rasterstereography provides an objective quantification and documentation of the post-operative cosmetic improvement of the back shape in standing posture. RELEVANCE STATEMENT: Based on the findings of this study rasterstereography in future enables both objective quantification of cosmetic improvement and significant reduction of X-rays in idiopathic scoliosis with Cobb angles higher than 50 degrees before and after anterior surgical correction and fusion.