Document Detail

Conditioned patellar tendon-tap reflexes in patients with ACL reconstruction.
MedLine Citation:
PMID:  10376484     Owner:  NLM     Status:  MEDLINE    
The patellar tendon-tap stretch reflexes were examined in six neurologically healthy young subjects (mean age = 27.1 yrs) who had developed persistent quadriceps strength deficit due to ACL reconstruction. Each subject was tested on two separate days. A specially designed apparatus was used to examine the unilateral and conditioned patellar tendon-tap reflex response utilizing three different conditioning intervals: 25 ms, 75 ms, 150 ms, and a unilateral reflex (control). Peak isometric force and contraction time were measured by using a strain gauge. Also, peak-to-peak EMG was measured by using bipolar surface electrodes which were placed over the middle of the rectus femoris. All data were collected with a microcomputer (sample rate = 1 kHz). Due to the small sample, the Kruskal-Wallis nonparametric analysis of variance was performed. All subjects demonstrated quadriceps strength deficits in the ACL leg when compared with the contralateral leg. This analysis determined that for both the ACL leg and the Non ACL leg the size of stretch reflex was facilitated at the long-latency conditioning intervals (75 and 150 ms), whereas it was inhibited at the short-latency conditioning interval (25ms). However, the ANOVA model failed to reveal any differences in the conditioned stretch reflex between the ACL leg and the Non ACL leg. Also, no differences were observed at the unilateral condition. Taken together, these results indicate that ACL reconstruction results in significant strength deficits, but does not alter unilateral or conditioned reflex profiles.
M Tsuruike; D M Koceja
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Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't    
Journal Detail:
Title:  International journal of sports medicine     Volume:  20     ISSN:  0172-4622     ISO Abbreviation:  Int J Sports Med     Publication Date:  1999 May 
Date Detail:
Created Date:  1999-08-30     Completed Date:  1999-08-30     Revised Date:  2006-11-15    
Medline Journal Info:
Nlm Unique ID:  8008349     Medline TA:  Int J Sports Med     Country:  GERMANY    
Other Details:
Languages:  eng     Pagination:  263-6     Citation Subset:  IM    
Department of Kinesiology, Indiana University, Bloomington, USA.
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MeSH Terms
Anterior Cruciate Ligament / physiology,  surgery*
Conditioning, Classical
Patella / physiology
Reconstructive Surgical Procedures*
Reflex, Stretch / physiology*
Tendons / physiology

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