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Biomechanics principle of elbow joint for transhumeral prostheses: comparison of normal hand, body-powered, myoelectric & air splint prostheses.

Abd Razak NA, Abu Osman NA, Gholizadeh H, Ali S - Biomed Eng Online (2014)

Bottom Line: The study also compares the force, torque and pressure while using all three types of prosthetics with the normal hand.The result was measured from the elbow kinematics of seven amputees, using three different types of prosthetics.These technological advances in assessment the biomechanics of an elbow joint for three different type of prosthetics with the normal hand bring the new information for the amputees and prosthetist to choose the most suitable device to be worn daily.

View Article: PubMed Central - PubMed

Affiliation: Department of Biomedical Engineering, Faculty of Engineering, University of Malaya, Kuala Lumpur 50603, Malaysia. nas_role85@yahoo.com.

ABSTRACT

Background: Understanding of kinematics force applied at the elbow is important in many fields, including biomechanics, biomedical engineering and rehabilitation. This paper provides a comparison of a mathematical model of elbow joint using three different types of prosthetics for transhumeral user, and characterizes the forces required to overcome the passive mechanical of the prosthetics at the residual limb.

Methods: The study modeled the elbow as a universal joint with intersecting axes of x-axis and y-axis in a plain of upper arm and lower arm. The equations of force applied, torque, weight and length of different type of prosthetics and the anthropometry of prosthetics hand are discussed in this study. The study also compares the force, torque and pressure while using all three types of prosthetics with the normal hand.

Results: The result was measured from the elbow kinematics of seven amputees, using three different types of prosthetics. The F-Scan sensor used in the study is to determine the pressure applied at the residual limb while wearing different type of prostheses.

Conclusion: These technological advances in assessment the biomechanics of an elbow joint for three different type of prosthetics with the normal hand bring the new information for the amputees and prosthetist to choose the most suitable device to be worn daily.

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Related in: MedlinePlus

Comparison of free body diagram from three different types of prostheses; B. Body-powered prosthetic, C. Myoelectric prosthetic, D. Air splint prosthetic and A. normal human hand. (S= shoulder, E= elbow, A= arm and P= prosthetic). The forces direction react referring to the x-axis and y-axis.
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Fig2: Comparison of free body diagram from three different types of prostheses; B. Body-powered prosthetic, C. Myoelectric prosthetic, D. Air splint prosthetic and A. normal human hand. (S= shoulder, E= elbow, A= arm and P= prosthetic). The forces direction react referring to the x-axis and y-axis.

Mentions: The annual daily life activities (ADL) involve the length and slenderness of the upper limb mean that act at a large distance from the axes of rotation of the joints, and so have a sizeable lever arm [12–14]. Against this are set the upper limb muscles, which must hold a posture or move the hand against an external load known as Fbiceps in this study. The muscles themselves were all acting at very small movement arms about the joint axes’ origin (elbow, in this study) and thus act at a great mechanical disadvantage [12–14]. Their tensions must be scaled up greatly, in order to attain equilibrium across the joint, known as Fhumerus. As a result of this the joint forces (Ftotal) will be much larger than the external loads, Farm and the majority of the forces will be caused by the internal muscle tensions, and not by the relatively small external load [21, 25, 26]. Equation below determines how the total force occurs at the elbow joint for normal human hand (Figure 2A).12


Biomechanics principle of elbow joint for transhumeral prostheses: comparison of normal hand, body-powered, myoelectric & air splint prostheses.

Abd Razak NA, Abu Osman NA, Gholizadeh H, Ali S - Biomed Eng Online (2014)

Comparison of free body diagram from three different types of prostheses; B. Body-powered prosthetic, C. Myoelectric prosthetic, D. Air splint prosthetic and A. normal human hand. (S= shoulder, E= elbow, A= arm and P= prosthetic). The forces direction react referring to the x-axis and y-axis.
© Copyright Policy - open-access
Related In: Results  -  Collection

License 1 - License 2
Show All Figures
getmorefigures.php?uid=PMC4228154&req=5

Fig2: Comparison of free body diagram from three different types of prostheses; B. Body-powered prosthetic, C. Myoelectric prosthetic, D. Air splint prosthetic and A. normal human hand. (S= shoulder, E= elbow, A= arm and P= prosthetic). The forces direction react referring to the x-axis and y-axis.
Mentions: The annual daily life activities (ADL) involve the length and slenderness of the upper limb mean that act at a large distance from the axes of rotation of the joints, and so have a sizeable lever arm [12–14]. Against this are set the upper limb muscles, which must hold a posture or move the hand against an external load known as Fbiceps in this study. The muscles themselves were all acting at very small movement arms about the joint axes’ origin (elbow, in this study) and thus act at a great mechanical disadvantage [12–14]. Their tensions must be scaled up greatly, in order to attain equilibrium across the joint, known as Fhumerus. As a result of this the joint forces (Ftotal) will be much larger than the external loads, Farm and the majority of the forces will be caused by the internal muscle tensions, and not by the relatively small external load [21, 25, 26]. Equation below determines how the total force occurs at the elbow joint for normal human hand (Figure 2A).12

Bottom Line: The study also compares the force, torque and pressure while using all three types of prosthetics with the normal hand.The result was measured from the elbow kinematics of seven amputees, using three different types of prosthetics.These technological advances in assessment the biomechanics of an elbow joint for three different type of prosthetics with the normal hand bring the new information for the amputees and prosthetist to choose the most suitable device to be worn daily.

View Article: PubMed Central - PubMed

Affiliation: Department of Biomedical Engineering, Faculty of Engineering, University of Malaya, Kuala Lumpur 50603, Malaysia. nas_role85@yahoo.com.

ABSTRACT

Background: Understanding of kinematics force applied at the elbow is important in many fields, including biomechanics, biomedical engineering and rehabilitation. This paper provides a comparison of a mathematical model of elbow joint using three different types of prosthetics for transhumeral user, and characterizes the forces required to overcome the passive mechanical of the prosthetics at the residual limb.

Methods: The study modeled the elbow as a universal joint with intersecting axes of x-axis and y-axis in a plain of upper arm and lower arm. The equations of force applied, torque, weight and length of different type of prosthetics and the anthropometry of prosthetics hand are discussed in this study. The study also compares the force, torque and pressure while using all three types of prosthetics with the normal hand.

Results: The result was measured from the elbow kinematics of seven amputees, using three different types of prosthetics. The F-Scan sensor used in the study is to determine the pressure applied at the residual limb while wearing different type of prostheses.

Conclusion: These technological advances in assessment the biomechanics of an elbow joint for three different type of prosthetics with the normal hand bring the new information for the amputees and prosthetist to choose the most suitable device to be worn daily.

Show MeSH
Related in: MedlinePlus