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Published in: Irish Journal of Medical Science (1971 -) 4/2016

01-11-2016 | Original Article

Characterisation of the patellar tendon reflex in cerebral palsy children using motion analysis

Authors: Rory O’Sullivan, Damien Kiernan, Michael Walsh, Tim O’Brien, Yahya Elhassan

Published in: Irish Journal of Medical Science (1971 -) | Issue 4/2016

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Abstract

Background

The patellar tendon reflex (PTR) is an important spinal reflex and an important diagnostic tool assessing neurological disturbances. Reflexes are conveniently assessed but quantifying the response can be subjective. Motion analysis is commonly used to assess gait kinematics in a variety of populations. It can be used to objectively assess the PTR with the advantage that standard technique and hammer can be used without the need for bulky apparatus or fixing the subject position.

Aim

To compare the PTR in 15 cerebral palsy (CP) children with age and height matched controls.

Methods

EMG reflex latency in the rectus femoris was assessed using a Noraxon 2400T unit. Knee movement latency, knee angular displacement and peak angular velocity were captured using the CODA mpx 30 system.

Results

EMG reflex latency was significantly reduced in CP compared to control limbs (13.11 versus 18.11 ms; p < 0.01) confirming a ‘brisk’ response in this population. The kinematic data found that while knee angular displacement was significantly reduced in CP (12.82° versus 20.06°; p < 0.01) there was no significant difference in movement latency or peak angular velocity compared to controls.

Conclusions

Subjective evaluation of the PTR relies mostly on change in knee angle. Using motion analysis we have confirmed a difference in this variable in CP compared to controls. We have also shown reduced reflex latency associated with a brisk reflex. Knee movement latency and peak angular velocity did not differentiate CP from normal. Further examination of the knee angular response of the PTR is warranted in CP.
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Metadata
Title
Characterisation of the patellar tendon reflex in cerebral palsy children using motion analysis
Authors
Rory O’Sullivan
Damien Kiernan
Michael Walsh
Tim O’Brien
Yahya Elhassan
Publication date
01-11-2016
Publisher
Springer London
Published in
Irish Journal of Medical Science (1971 -) / Issue 4/2016
Print ISSN: 0021-1265
Electronic ISSN: 1863-4362
DOI
https://doi.org/10.1007/s11845-015-1369-3

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