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The role of the knee joint sensory s...

Gage, William Henry.

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The role of the knee joint sensory system in human postural control.

Record Type:	Electronic resources : Monograph/item
Title/Author:	The role of the knee joint sensory system in human postural control./
Author:	Gage, William Henry.
Description:	170 p.
Notes:	Source: Dissertation Abstracts International, Volume: 64-08, Section: B, page: 3781.
Contained By:	Dissertation Abstracts International64-08B.
Subject:	Health Sciences, Recreation. -
Online resource:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=NQ82987
ISBN:	0612829871

The role of the knee joint sensory system in human postural control.
Gage, William Henry.

The role of the knee joint sensory system in human postural control. - 170 p.

Source: Dissertation Abstracts International, Volume: 64-08, Section: B, page: 3781.

Thesis (Ph.D.)--University of Waterloo (Canada), 2003.

The purpose of this thesis was to explore the influence of knee joint mechanoreceptors in the organization of the EMG and kinematic responses to a rotational support surface perturbation to postural control. The role of the knee joint mechanoreceptor system was investigated in two ways: first, by examining the postural response among total knee joint arthroplasty (TKA) patients to sagittal and frontal plane rotations of the support surface, and second, by examining the postural response to these postural perturbations among healthy young adults prior to, and following anaesthetization of one knee joint. The control of balance was preserved following TKA. However, significant differences were observed in temporal organization and amplitude of muscle responses, and in joint kinematic patterns, among the participants in both the surgical limb and sound limbs, which suggests a central reorganization of the balance control system after TKA. Center of mass displacement was significantly reduced following knee joint anaesthetization. All of the participants anecdotally reported perceptions of knee joint instability; changes in center of mass displacement might reflect a general sense of postural instability. Changes also were observed in the muscle activity and kinematic responses following joint anaesthetization. This set of experiments; two involving the TKA patients, and one involving the healthy young adults, demonstrated differences in the general response pattern to the rotational support surface perturbations. First, the patients did not demonstrate differences in the displacement of the center of mass, indicating that balance control was preserved. The young adults demonstrated clear changes in the control of balance; center of mass was significantly reduced following joint anaesthetization. Second, the patients demonstrated a stiffening of the knee joint, with EMG changes that were consistent with restricting joint movement. The young adults demonstrated EMG patterns that were consistent with promoting knee joint flexion; kinematic results confirmed increased joint flexion. The differences between the TKA patients, and the young adults after joint anaesthetization, confirm that the changes observed following TKA are not simply a result of changes in proprioception. These findings suggest that the responses observed among the TKA patients are the result of a complex reintegration of sensory information that might occur prior to, and following TKA. Generally, muscle onset latency changes were observed in response to frontal plane, but not sagittal plane perturbations. These direction-specific changes in muscle activity may be related to differences in the manner of loading experienced by the knee joint. (Abstract shortened by UMI.)

ISBN: 0612829871Subjects--Topical Terms:

1018003
Health Sciences, Recreation.

The role of the knee joint sensory system in human postural control.
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100 1 $a Gage, William Henry. $3 1945337
245 1 0 $a The role of the knee joint sensory system in human postural control.
300 $a 170 p.
500 $a Source: Dissertation Abstracts International, Volume: 64-08, Section: B, page: 3781.
500 $a Adviser: James S. Frank.
502 $a Thesis (Ph.D.)--University of Waterloo (Canada), 2003.
520 $a The purpose of this thesis was to explore the influence of knee joint mechanoreceptors in the organization of the EMG and kinematic responses to a rotational support surface perturbation to postural control. The role of the knee joint mechanoreceptor system was investigated in two ways: first, by examining the postural response among total knee joint arthroplasty (TKA) patients to sagittal and frontal plane rotations of the support surface, and second, by examining the postural response to these postural perturbations among healthy young adults prior to, and following anaesthetization of one knee joint. The control of balance was preserved following TKA. However, significant differences were observed in temporal organization and amplitude of muscle responses, and in joint kinematic patterns, among the participants in both the surgical limb and sound limbs, which suggests a central reorganization of the balance control system after TKA. Center of mass displacement was significantly reduced following knee joint anaesthetization. All of the participants anecdotally reported perceptions of knee joint instability; changes in center of mass displacement might reflect a general sense of postural instability. Changes also were observed in the muscle activity and kinematic responses following joint anaesthetization. This set of experiments; two involving the TKA patients, and one involving the healthy young adults, demonstrated differences in the general response pattern to the rotational support surface perturbations. First, the patients did not demonstrate differences in the displacement of the center of mass, indicating that balance control was preserved. The young adults demonstrated clear changes in the control of balance; center of mass was significantly reduced following joint anaesthetization. Second, the patients demonstrated a stiffening of the knee joint, with EMG changes that were consistent with restricting joint movement. The young adults demonstrated EMG patterns that were consistent with promoting knee joint flexion; kinematic results confirmed increased joint flexion. The differences between the TKA patients, and the young adults after joint anaesthetization, confirm that the changes observed following TKA are not simply a result of changes in proprioception. These findings suggest that the responses observed among the TKA patients are the result of a complex reintegration of sensory information that might occur prior to, and following TKA. Generally, muscle onset latency changes were observed in response to frontal plane, but not sagittal plane perturbations. These direction-specific changes in muscle activity may be related to differences in the manner of loading experienced by the knee joint. (Abstract shortened by UMI.)
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773 0 $t Dissertation Abstracts International $g 64-08B.
790 1 0 $a Frank, James S., $e advisor
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791 $a Ph.D.
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