Actions of Hip Muscles

Dostal, William F.; Soderberg, Gary L; Andrews, James G.

doi:10.1093/ptj/66.3.351

Cited by 197 publications

(138 citation statements)

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“…7(D)) ranged from −2.0 to 2.0 cm. For both of the gluteal muscles, the hip flexion moment arms determined experimentally 20 varied more with hip flexion than the moment arms computed with the 3D models. The peak hip adduction moment arms for the gluteus maximus fibers (Fig.…”

Section: Resultsmentioning

confidence: 79%

“…7(C)). Previous experiments, 20 which represented gluteus maximus with a single line of action, had a single peak moment arm that was slightly larger than the largest 3D model fiber moment arm. The peak hip extension moment arms for the gluteus medius fibers (Fig.…”

Section: Resultsmentioning

confidence: 82%

“…Individual fiber moment arms (ma fiber ) were calculated according to the principal of virtual work, 3 ma fiber = ∂l fiber /∂θ. We compared the fiber moment arms predicted by the models with moment arms determined from anatomical measurements 6,14,20,36 and published models of the lower extremity (with series-of-line-segment representations of muscle). 6,16 We also evaluated the models by comparing the changes in shape of the 3D muscle models with changes in shape measured from the MR images we acquired with the hip extended and flexed positions.…”

Section: Evaluations Of the Modelsmentioning

confidence: 99%

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Three-Dimensional Representation of Complex Muscle Architectures and Geometries

2005

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Abstract-Almost all computer models of the musculoskeletal system represent muscle geometry using a series of line segments. This simplification (i) limits the ability of models to accurately represent the paths of muscles with complex geometry and (ii) assumes that moment arms are equivalent for all fibers within a muscle (or muscle compartment). The goal of this work was to develop and evaluate a new method for creating three-dimensional (3D) finite-element models that represent complex muscle geometry and the variation in moment arms across fibers within a muscle. We created 3D models of the psoas, iliacus, gluteus maximus, and gluteus medius muscles from magnetic resonance (MR) images. Peak fiber moment arms varied substantially among fibers within each muscle (e.g., for the psoas the peak fiber hip flexion moment arms varied from 2 to 3 cm, and for the gluteus maximus the peak fiber hip extension moment arms varied from 1 to 7 cm). Moment arms from the literature were generally within the range of fiber moment arms predicted by the 3D models. The models accurately predicted changes in muscle surface geometry over a 55• range of hip flexion, as compared to changes in shape predicted from MR images (average errors between the model and measured surfaces were between 1.7 and 5.2 mm). This new framework for representing muscle will enhance the accuracy of computer models of the musculoskeletal system.

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Section: Resultsmentioning

confidence: 79%

Section: Resultsmentioning

confidence: 82%

Section: Evaluations Of the Modelsmentioning

confidence: 99%

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Three-Dimensional Representation of Complex Muscle Architectures and Geometries

2005

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“…This decrease in RF specificity of muscle action is attributed to the biarticular nature of the muscle (i.e., it acts at both the knee and hip joints) and its secondary action as a hip abductor, 30 which was clearly visible in many of our subjects. Significantly higher specificity was observed in the VL and VM muscles of dominant limb (right) of our subjects.…”

Section: Discussionmentioning

confidence: 78%

Quadriceps and hamstrings muscle control in athletic males and females

Krishnan

Huston

Amendola

et al. 2008

Journal Orthopaedic Research

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The aim of this study was to investigate whether athletic males and females have differences in their quadriceps and hamstrings muscle control strategies. Twenty-four people (12 males, 12 females) active in level I activities volunteered to participate. The subjects' muscle control strategies were studied using electromyography and a target matching protocol that assesses one's ability to produce force with control. The degree of control exhibited in the subjects' quadriceps and hamstrings muscle activation strategies was evaluated by calculating specificity indices for each muscle using circular statistics. Females displayed significantly lower specificity than males in their vastus medialis (p < 0.001), rectus femoris (p ¼ 0.044), and lateral hamstrings (p ¼ 0.001) muscle activity patterns, but similar specificity in their vastus lateralis and medial hamstrings activity patterns. Females also used a significantly higher magnitude of vastus lateralis (p < 0.001) and vastus medialis (p < 0.001) muscle activity than males to achieve the same relative force level. These findings indicate athletic males and females have differences in their knee muscle control strategies. ß

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“…This finding might result from the increase in MA of the internal rotators and reversal of the rotary action of some of the external rotators 1) . Dostal et al 5) reported that although there are no primary or assistant hip internal rotators in the anatomical position, the anterior and middle fibers of the gluteus medius and minimus muscles work as hip internal rotators at 40° of hip flexion. In addition, posterior fibers of the gluteus medius and minimus and piriformis muscles also work as hip internal rotators at 90° of hip flexion.…”

Section: Discussionmentioning

confidence: 99%

Differences of Isometric Internal and External Hip Rotation Torques among Three Different Hip Flexion Positions

Uritani

Fukumoto

2012

J Phys Ther Sci

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Abstract.[Purpose] The aim of this study was to investigate isometric internal and external rotation torques of the hip at three different flexed positions of the hip.[Subjects] Twenty healthy university students.[Methods] Isometric internal and external maximum rotation torques of the hip on both sides were measured using a torque machine in the recumbent, semi-recumbent and sitting positions. Dependent variables were the isometric internal and external rotation peak torques of the hip. Independent variables were the three testing positions and each side. Measured data were analyzed using two-way analysis of variance with a post-hoc test.[Results] Mean isometric internal rotation torque was significantly higher in the sitting position than in the recumbent or semi-recumbent positions. Torque was also significantly higher in the semi-recumbent position than in the recumbent position. No interaction between testing position and leg side was found. Regarding isometric external rotation, no interaction or main effects were found among the three positions.[Conclusion] Isometric hip internal rotation torque significantly increased as the hip flexed; however, external rotation did not change significantly.

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Actions of Hip Muscles

Cited by 197 publications

References 0 publications

Three-Dimensional Representation of Complex Muscle Architectures and Geometries

Three-Dimensional Representation of Complex Muscle Architectures and Geometries

Quadriceps and hamstrings muscle control in athletic males and females

Differences of Isometric Internal and External Hip Rotation Torques among Three Different Hip Flexion Positions

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