Predicting the Functional Roles of Knee Joint Muscles from Internal Joint Moments
(2017) In Medicine and Science in Sports and Exercise 49(3). p.527-537- Abstract
Introduction Knee muscles are commonly labeled as flexors or extensors and aptly stabilize the knee against sagittal plane loads. However, how these muscles stabilize the knee against adduction-abduction and rotational loads remains unclear. Our study sought 1) to classify muscle roles as they relate to joint stability by quantifying the relationship between individual muscle activation patterns and internal net joint moments in all three loading planes and 2) to determine whether these roles change with increasing force levels. Methods A standing isometric force matching protocol required subjects to modulate ground reaction forces to elicit various combinations and magnitudes of sagittal, frontal, and transverse internal joint... (More)
Introduction Knee muscles are commonly labeled as flexors or extensors and aptly stabilize the knee against sagittal plane loads. However, how these muscles stabilize the knee against adduction-abduction and rotational loads remains unclear. Our study sought 1) to classify muscle roles as they relate to joint stability by quantifying the relationship between individual muscle activation patterns and internal net joint moments in all three loading planes and 2) to determine whether these roles change with increasing force levels. Methods A standing isometric force matching protocol required subjects to modulate ground reaction forces to elicit various combinations and magnitudes of sagittal, frontal, and transverse internal joint moments. Surface EMG measured activities of 10 lower limb muscles. Partial least squares regressions determined which internal moment(s) were significantly related to the activation of individual muscles. Results Rectus femoris and tensor fasciae latae were classified as moment actuators for knee extension and hip flexion. Hamstrings were classified as moment actuators for hip extension and knee flexion. Gastrocnemius and hamstring muscles were classified as specific joint stabilizers for knee rotation. Vastii were classified as general joint stabilizers because activation was independent of moment generation. Muscle roles did not change with increasing effort levels. Conclusions Our findings indicate muscle activation is not dependent on anatomical orientation but perhaps on its role in maintaining knee joint stability in the frontal and transverse loading planes. This is useful for delineating the roles of biarticular knee joint muscles and could have implications in robotics, musculoskeletal modeling, sports sciences, and rehabilitation.
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- author
- Flaxman, Teresa E. ; AlkjÆr, Tine ; Simonsen, Erik B. ; Krogsgaard, Michael R. and Benoit, Daniel L. LU
- publishing date
- 2017-03-01
- type
- Contribution to journal
- publication status
- published
- keywords
- HEALTHY CONTROLS, KNEE JOINT STABILITY, LOWER LIMB KINETICS, MUSCLE ACTIVITY, PARTIAL LEAST SQUARES REGRESSION
- in
- Medicine and Science in Sports and Exercise
- volume
- 49
- issue
- 3
- pages
- 11 pages
- publisher
- Lippincott Williams & Wilkins
- external identifiers
-
- pmid:27755353
- scopus:84991508595
- ISSN
- 0195-9131
- DOI
- 10.1249/MSS.0000000000001125
- language
- English
- LU publication?
- no
- additional info
- Publisher Copyright: © Copyright 2017 by the American College of Sports Medicine.
- id
- 53e44bc3-7839-4e2c-9843-e93b28d10ce1
- date added to LUP
- 2023-08-24 16:47:44
- date last changed
- 2024-04-20 01:42:49
@article{53e44bc3-7839-4e2c-9843-e93b28d10ce1, abstract = {{<p>Introduction Knee muscles are commonly labeled as flexors or extensors and aptly stabilize the knee against sagittal plane loads. However, how these muscles stabilize the knee against adduction-abduction and rotational loads remains unclear. Our study sought 1) to classify muscle roles as they relate to joint stability by quantifying the relationship between individual muscle activation patterns and internal net joint moments in all three loading planes and 2) to determine whether these roles change with increasing force levels. Methods A standing isometric force matching protocol required subjects to modulate ground reaction forces to elicit various combinations and magnitudes of sagittal, frontal, and transverse internal joint moments. Surface EMG measured activities of 10 lower limb muscles. Partial least squares regressions determined which internal moment(s) were significantly related to the activation of individual muscles. Results Rectus femoris and tensor fasciae latae were classified as moment actuators for knee extension and hip flexion. Hamstrings were classified as moment actuators for hip extension and knee flexion. Gastrocnemius and hamstring muscles were classified as specific joint stabilizers for knee rotation. Vastii were classified as general joint stabilizers because activation was independent of moment generation. Muscle roles did not change with increasing effort levels. Conclusions Our findings indicate muscle activation is not dependent on anatomical orientation but perhaps on its role in maintaining knee joint stability in the frontal and transverse loading planes. This is useful for delineating the roles of biarticular knee joint muscles and could have implications in robotics, musculoskeletal modeling, sports sciences, and rehabilitation.</p>}}, author = {{Flaxman, Teresa E. and AlkjÆr, Tine and Simonsen, Erik B. and Krogsgaard, Michael R. and Benoit, Daniel L.}}, issn = {{0195-9131}}, keywords = {{HEALTHY CONTROLS; KNEE JOINT STABILITY; LOWER LIMB KINETICS; MUSCLE ACTIVITY; PARTIAL LEAST SQUARES REGRESSION}}, language = {{eng}}, month = {{03}}, number = {{3}}, pages = {{527--537}}, publisher = {{Lippincott Williams & Wilkins}}, series = {{Medicine and Science in Sports and Exercise}}, title = {{Predicting the Functional Roles of Knee Joint Muscles from Internal Joint Moments}}, url = {{http://dx.doi.org/10.1249/MSS.0000000000001125}}, doi = {{10.1249/MSS.0000000000001125}}, volume = {{49}}, year = {{2017}}, }