Muscle moment arm and normalized moment contributions as reference data for musculoskeletal elbow and wrist joint models

Ramsay, John W.; Hunter, Betsy V.; Gonzalez, Roger V.

doi:10.1016/j.jbiomech.2008.11.035

Cited by 62 publications

(46 citation statements)

References 27 publications

(40 reference statements)

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“…Of particular benefit with regard to the open-source nature of our model is the ease with which our model can be integrated with existing OpenSim models. For example, assimilating our model with existing models of the limbs and other sections of the spine (Delp et al 1990;Vasavada et al 1998;Holzbaur et al 2005;Crabtree and Higginson 2009;Ramsay et al 2009;Arnold et al 2010;Xiao and Higginson 2010) will hopefully lead to more accurate musculoskeletal models for the purposes of improved analysis of specific physiological parameters of interest.…”

Section: Discussionmentioning

confidence: 99%

A Musculoskeletal model for the lumbar spine

Christophy

Senan

Lotz

et al. 2011

Biomech Model Mechanobiol

246

228

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A new musculoskeletal model for the lumbar spine is described in this paper. This model features a rigid pelvis and sacrum, the five lumbar vertebrae, and a rigid torso consisting of a lumped thoracic spine and ribcage. The motion of the individual lumbar vertebrae was defined as a fraction of the net lumbar movement about the three rotational degrees of freedom: flexion-extension lateral bending, and axial rotation. Additionally, the eight main muscle groups of the lumbar spine were incorporated using 238 muscle fascicles with prescriptions for the parameters in the Hill-type muscle models obtained with the help of an extensive literature survey. The features of the model include the abilities to predict joint reactions, muscle forces, and muscle activation patterns. To illustrate the capabilities of the model and validate its physiological similarity, the model's predictions for the moment arms of the muscles are shown for a range of flexion-extension motions of the lower back. The model uses the OpenSim platform and is freely available on https://www.simtk.org/home/lumbarspine to other spinal researchers interested in analyzing the kinematics of the spine. The model can also be integrated with existing OpenSim models to build more comprehensive models of the human body.

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Section: Discussionmentioning

confidence: 99%

A Musculoskeletal model for the lumbar spine

Christophy

Senan

Lotz

et al. 2011

Biomech Model Mechanobiol

246

228

View full text Add to dashboard Cite

show abstract

“…r m and PCSA m are the flexion/extension moment arm and the PCSA of the m muscle. PCSA data were taken from Chao et al (1989) for the fingers and from Ramsay et al (2009) for the wrist. According to the posture adopted during this experiment, muscle moment arms were computed assuming a neutral position (0° in flexion-extension, abduction-adduction and pronation-supination) for all joints using the data from Chao et al (1989) for the fingers and from Lemay and Crago (1996) for the wrist.…”

Section: Data Analysis and Estimations Of The Muscle Capacitiesmentioning

confidence: 99%

Estimation of hand and wrist muscle capacities in rock climbers

2014

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imbalance between flexor and extensor capacities which suggests a potential risk of pathologies. Conclusions The practice of climbing not only increased the strength of climbers but also resulted in specific adaptations among hand muscles. The proposed method and the obtained data could be re-used to optimize the training programs as well as the rehabilitation processes following hand pathologies. Muscle imbalance ratio of the j joint (j = MCP or wrist) Keywords AbstractPurpose This study investigated the hand and wrist muscle capacities among expert rock climbers and compared them with those of non-climbers. The objective was to identify the adaptations resulting from several years of climbing practice. Methods Twelve climbers (nine males and three females) and 13 non-climber males participated in this study. Each subject performed a set of maximal voluntary contractions about the wrist and the metacarpo-phalengeal joints during which net joint moments and electromyographic activities were recorded. From this data set, the muscle capacities of the five main muscle groups of the hand (wrist flexors, wrist extensors, finger flexors, finger extensors and intrinsic muscles) were estimated using a biomechanical model. This process consisted in adjusting the physiological crosssectional area (PCSA) and the maximal muscle stress value from an initial generic model. Results Results obtained from the model provided several new pieces of information compared to the analysis of only the net joint moments. Particularly, the capacities of the climbers were 37.1 % higher for finger flexors compared to non-climbers and were similar for finger extensor and for the other muscle groups. Climbers thus presented a greaterCommunicated by Nicolas Place.

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“…As such, they can be used for simulating surgery and analyzing neuromuscular control (Holzbaur et al, 2005), analyzing the affect of muscle architecture and moment arms on joint moments (Gonzalez et al, 1997), simulating upper extremity movements (Lemay and Crago, 1996), and determining muscle moment arms as functions of multiple joint angles (Ramsay et al, 2009).…”

Section: Introductionmentioning

confidence: 99%