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Bioengineering Laboratory, Department of Orthopaedic Surgery, Louisiana State University Medical Center, New Orleans, Louisiana
Bioengineering Laboratory, Department of Orthopaedic Surgery, Louisiana State University Medical Center, New Orleans, Louisiana
Bioengineering Laboratory, Department of Orthopaedic Surgery, Louisiana State University Medical Center, New Orleans, Louisiana
Bioengineering Laboratory, Department of Orthopaedic Surgery, Louisiana State University Medical Center, New Orleans, Louisiana
Bioengineering Laboratory, Department of Orthopaedic Surgery, Louisiana State University Medical Center, New Orleans, Louisiana
Bioengineering Laboratory, Department of Orthopaedic Surgery, Louisiana State University Medical Center, New Orleans, Louisiana
Bioengineering Laboratory, Department of Orthopaedic Surgery, Louisiana State University Medical Center, New Orleans, Louisiana
The synergistic action of the ACL and the thigh muscles in maintaining joint stability was studied experimentally. The EMG from the quadriceps and hamstring muscle groups was recorded and analyzed in three separate experimental procedures in which the knee was stressed. The test revealed that direct stress of the ACL has a moderate inhibitory effect on the quadriceps, but simultaneously it directly excites the hamstrings. Similar responses were also obtained in patients with ACL damage during loaded knee extension with tibia subluxation, indicating that an alternative reflex arc unrelated to ACL receptors was available to maintain joint integrity.
The antagonist muscles (hamstrings) were clearly demonstrated to assume the role of joint stabilizers in the patient who has a deficient ACL. The importance of an appropriate muscle-conditioning rehabilitation program in such a patient is substantiated.
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R. C. More, B. T. Karras, R. Neiman, D. Fritschy, S. L-Y Woo, and D. M. Daniel Hamstrings--an anterior cruciate ligament protagonist: An in vitro study Am. J. Sports Med., March 1, 1993; 21(2): 231 - 237. [Abstract] [PDF]
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H. H. Paessler, J. Deneke, and L. E. Dahners Augmented repair and early mobilization of acute anterior cruciate ligament injuries Am. J. Sports Med., December 1, 1992; 20(6): 667 - 674. [Abstract] [PDF]
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R. M. Biedert, E. Stauffer, and N. F. Friederich Occurrence of free nerve endings in the soft tissue of the knee joint: A histologic investigation Am. J. Sports Med., July 1, 1992; 20(4): 430 - 433. [Abstract] [PDF]
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S. Hirokawa, M. Solomonow, Yun Lu, Z.-P. Lou, and R. D'Ambrosia Anterior-posterior and rotational displacement of the tibia elicited by quadriceps contraction Am. J. Sports Med., June 1, 1992; 20(3): 299 - 306. [Abstract] [PDF]
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A. Amendola and P. Fowler Allograft anterior cruciate ligament reconstruction in a sheep model: The effect of synthetic augmentation Am. J. Sports Med., June 1, 1992; 20(3): 336 - 346. [Abstract] [PDF]
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P. Kannus, M. Jarvinen, R. Johnson, P. Renstrom, M. Pope, B. Beynnon, C. Nichols, and M. Kaplan Function of the quadriceps and hamstrings muscles in knees with chronic partial deficiency of the anterior cruciate ligament: Isometric and isokinetic evaluation Am. J. Sports Med., March 1, 1992; 20(2): 162 - 168. [Abstract] [PDF]
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H. Gauffin and H. Tropp Altered movement and muscular-activation patterns during the one-legged jump in patients with an old anterior cruciate ligament rupture Am. J. Sports Med., March 1, 1992; 20(2): 182 - 192. [Abstract] [PDF]
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W. B. Kibler, C. Goldberg, and T. J. Chandler Functional biomechanical deficits in running athletes with plantar fasciitis Am. J. Sports Med., January 1, 1991; 19(1): 66 - 71. [Abstract] [PDF]
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S. M. Howell Anterior tibial translation during a maximum quadriceps contraction: Is it clinically significant? Am. J. Sports Med., December 1, 1990; 18(6): 573 - 578. [Abstract] [PDF]
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D. F. Pope, K. J. Cole, and R. A. Brand Physiologic loading of the anterior cruciate ligament does not activate quadriceps or hamstrings in the anesthetized cat Am. J. Sports Med., December 1, 1990; 18(6): 595 - 599. [Abstract] [PDF]
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S. Kalund, T. Sinkjaer, L. Arendt-Nielsen, and O. Simonsen Altered timing of hamstring muscle action in anterior cruciate ligament deficient patients Am. J. Sports Med., June 1, 1990; 18(3): 245 - 248. [Abstract] [PDF]
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S. Hagood, M. Solomonow, R. Baratta, B.H. Zhou, and R. D'Ambrosia The effect of joint velocity on the contribution of the antagonist musculature to knee stiffness and laxity Am. J. Sports Med., March 1, 1990; 18(2): 182 - 187. [Abstract] [PDF]
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H. Jonsson, J. Karrholm, and L.-G. Elmqvist Kinematics of active knee extension after tear of the anterior cruciate ligament Am. J. Sports Med., December 1, 1989; 17(6): 796 - 802. [Abstract] [PDF]
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R. Lorentzon, L.-G. Elmqvist, M. Sjostrom, M. Fagerlund, and A. R. Fugl-Meyer Thigh musculature in relation to chronic anterior cruciate ligament tear: Muscle size, morphology, and mechanical output before reconstruction Am. J. Sports Med., June 1, 1989; 17(3): 423 - 429. [Abstract] [PDF]
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T. P. Branch, R. Hunter, and M. Donath Dynamic EMG analysis of anterior cruciate deficient legs with and without bracing during cutting Am. J. Sports Med., January 1, 1989; 17(1): 35 - 41. [Abstract] [PDF]
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R. Baratta, M. Solomonow, B.H. Zhou, D. Letson, R. Chuinard, and R. D'Ambrosia Muscular coactivation: The role of the antagonist musculature in maintaining knee stability Am. J. Sports Med., March 1, 1988; 16(2): 113 - 122. [Abstract] [PDF]
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