Bone position estimation from skin marker co-ordinates using global optimisation with joint constraints

Lu, Tung‐Wu; O’Connor, John

doi:10.1016/s0021-9290(98)00158-4

Cited by 794 publications

(536 citation statements)

References 16 publications

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“…Anthropometric characteristics were obtained. Following the method of Cappozzo et al [8], 36 reflective markers (14 mm diameter), including 30 lower extremity markers, were placed on the participant [18,19]. An additional six markers were placed on the steps to later identify their spatial locations.…”

Section: Methodsmentioning

confidence: 99%

Does Interlimb Knee Symmetry Exist After Unicompartmental Knee Arthroplasty?

Simpson

Kinsey³

et al. 2013

Clinical Orthopaedics &Amp; Related Research

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Section: Methodsmentioning

confidence: 99%

Does Interlimb Knee Symmetry Exist After Unicompartmental Knee Arthroplasty?

Simpson

Kinsey³

et al. 2013

Clinical Orthopaedics &Amp; Related Research

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“…L M o : L T s was maintained). Virtual markers were placed on the model to match the locations of the experimental markers and an inverse kinematics algorithm was used to determine the joint angles of the model over 10 complete gait cycles [41,42]. Ten right-side gait cycles were segmented using the measured ground reaction force to identify heel strike.…”

Section: Methodsmentioning

confidence: 99%

Fibre operating lengths of human lower limb muscles during walking

Arnold

Delp

2011

Phil. Trans. R. Soc. B

116

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Muscles actuate movement by generating forces. The forces generated by muscles are highly dependent on their fibre lengths, yet it is difficult to measure the lengths over which muscle fibres operate during movement. We combined experimental measurements of joint angles and muscle activation patterns during walking with a musculoskeletal model that captures the relationships between muscle fibre lengths, joint angles and muscle activations for muscles of the lower limb. We used this musculoskeletal model to produce a simulation of muscle-tendon dynamics during walking and calculated fibre operating lengths (i.e. the length of muscle fibres relative to their optimal fibre length) for 17 lower limb muscles. Our results indicate that when musculotendon compliance is low, the muscle fibre operating length is determined predominantly by the joint angles and muscle moment arms. If musculotendon compliance is high, muscle fibre operating length is more dependent on activation level and force-length -velocity effects. We found that muscles operate on multiple limbs of the force -length curve (i.e. ascending, plateau and descending limbs) during the gait cycle, but are active within a smaller portion of their total operating range.

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“…The model anthropomorphic properties as well as the muscle-tendon unit insertion, origin and their bone wrapping points were linearly scaled on the basis of the relative distances between experimental and corresponding virtual markers 44 . Inverse kinematics was solved for three-dimensional joint angles that minimized the least-squared error between experimental and virtual marker locations during dynamic trials 46 . The generated kinematics were then used to obtain dynamically consistent joint moments via residual reduction analysis, i.e.…”

Section: Model-based Estimationmentioning

confidence: 99%

Man/machine interface based on the discharge timings of spinal motor neurons after targeted muscle reinnervation

et al. 2017

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The intuitive control of upper - limb prostheses requires a man/machine interface that directly exploits biological signals. Here, we define and experimentally test an offline man/machine interface that takes advantage of the discharge timings of spinal moto r neurons. The motor - neuron behaviour is identified by deconvolution of the electrical activity of muscles reinnervated by nerves of a missing limb in patients with amputation at the shoulder or humeral level. We mapped the series of motor - neuron discharge s into control commands across multiple degrees of freedom via the offline application of direct proportional control, pattern recognition and musculoskeletal modelling. A series of experiments performed on six patients reveal that the man/machine interfac e has superior offline performance than conventional direct electromyographic control applied after targeted muscle innervation. The combination of surgical procedures, decoding and mapping into effective commands constitutes an interface with the output l ayers of the spinal cord circuitry that allows for the intuitive control of multiple degrees of freedom

show abstract

Bone position estimation from skin marker co-ordinates using global optimisation with joint constraints

Cited by 794 publications

References 16 publications

Does Interlimb Knee Symmetry Exist After Unicompartmental Knee Arthroplasty?

Does Interlimb Knee Symmetry Exist After Unicompartmental Knee Arthroplasty?

Fibre operating lengths of human lower limb muscles during walking

Man/machine interface based on the discharge timings of spinal motor neurons after targeted muscle reinnervation

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