biotensegrity modeling 1.1 © 2005 intension designs ltd. walking motion Tensegrity Leg/Foot model 05-TLF-4.2 Biotensegrity Modeling of the Leg and Foot The representation of the leg and foot combines several different tensegrity elements. The pelvic connection is indicated by an expanded octahedral tensegrity (see the tensegrity pel- vis study guide). The knee joint is modeled by an octahedral tensegrity that transfers weight from the femur and torso above, to the tibia and foot below, and yet allows flexion and dorsiflexion in the knee and ankle. As the condyles in the femur and tibia interdigitate, their surfaces do not touch; tension forces cross mul- tiple joints and simple lever models with fixed fulcrums do not apply. The human torso is enantiomorphic or bilaterally symmetrical and rota- tional tensegrity forms are required when modeling the foot. The forces transferred from the tibia to the talus and the calcaneus, are distributed using a four strut rotational tenseg- rity. Additional struts, suggesting the tarsals and metatarsals are added to create the essential stability of the structure’s medial and lateral arches. The resulting form is self-supporting, yet none of the compression ele- ments are in direct weight-bearing contact. Proper gait requires dorsiflexion of the foot on landing and plantar flexion on lift off and a biotensegrity model of the leg and foot includes these functions in the tensional link- age between the knee and ankle. A prosthetic leg and foot based upon this model would thus feel proprio- ceptively correct to the wearer. The concept of biotensegrity offers a better framework than traditional biomechanics to explain how living structures are adapted to withstand dynamic stresses and yet remain structurally flexible and durable. Better description means better prescription, which means more suc- cessful treatment methods to benefit patients and clients. tensegrity leg/foot
Welcome message from author
This document is posted to help you gain knowledge. Please leave a comment to let me know what you think about it! Share it to your friends and learn new things together.
Transcript
biotensegrity modeling
1.1 © 2005 intension designs ltd.
walking motion
Tensegrity Leg/Footmodel 05-TLF-4.2
Biotensegrity Modelingof the Leg and Foot
The representation of the leg and foot combines several different tensegrity elements. The pelvic connection is indicated by an expanded octahedral tensegrity (see the tensegrity pel-vis study guide). The knee joint is modeled by an octahedral tensegrity that transfers weight from the femur and torso above, to the tibia and foot below, and yet allows fl exion and dorsifl exion in the knee and ankle.
As the condyles in the femur and tibia interdigitate, their surfaces do not touch; tension forces cross mul-tiple joints and simple lever models with fi xed fulcrums do not apply.
The human torso is enantiomorphic or bilaterally symmetrical and rota-tional tensegrity forms are required when modeling the foot. The forces transferred from the tibia to the talus and the calcaneus, are distributed using a four strut rotational tenseg-rity. Additional struts, suggesting the tarsals and metatarsals are added to create the essential stability of the structure’s medial and lateral arches.
The resulting form is self-supporting, yet none of the compression ele-ments are in direct weight-bearing contact.
Proper gait requires dorsifl exion of the foot on landing and plantar fl exion on lift off and a biotensegrity model of the leg and foot includes these functions in the tensional link-age between the knee and ankle. A prosthetic leg and foot based upon this model would thus feel proprio-ceptively correct to the wearer.
The concept of biotensegrity offers a better framework than traditional biomechanics to explain how living structures are adapted to withstand dynamic stresses and yet remain structurally fl exible and durable.
Better description means better prescription, which means more suc-cessful treatment methods to benefi t patients and clients.
tensegrity leg/foot
Related Documents
