Document Detail

Influence of postoperative immobilization on tendon length after radiofrequency-induced shrinkage. An in vivo rabbit study.
MedLine Citation:
PMID:  12531754     Owner:  NLM     Status:  MEDLINE    
BACKGROUND: Despite the widespread use of radiofrequency-induced shrinkage of collagenous tissues, there have been no animal studies on the effects of postoperative immobilization after such treatment. PURPOSE: To examine the effects of postoperative immobilization after radiofrequency energy treatment, with special emphasis on any tissue length increases. STUDY DESIGN: Controlled laboratory study. METHODS: The right patellar tendon of 60 New Zealand White rabbits was shrunk with a radiofrequency probe. Tendon length was measured intraoperatively before and after shrinkage and via radiographs immediately postoperatively and at 3, 6, and 9 weeks. Twenty rabbits were not immobilized, 20 were immobilized for 3 weeks, and 20 were immobilized for 6 weeks. RESULTS: In the nonimmobilized limbs, the tendon length increased 34.9% at 3 weeks and another 2.5% at 6 weeks, versus 11.2% at 3 weeks and 6.6% at 6 weeks in the immobilized limbs. Ten of the 20 rabbits that were immobilized for 6 weeks were sacrificed at 9 weeks and were found to have a further length increase of 10.8%. At 9 weeks, the tendons of this group were no longer significantly shorter than the tendons from rabbits that had not been immobilized. CONCLUSIONS: Careful postoperative rehabilitation is imperative after radiofrequency-induced shrinkage. Without protection, exposure to normal physiologic loads places the shrunken tissue at risk of stretching out beyond the preshrinkage length. CLINICAL RELEVANCE: Shrunken tissue is at risk of stretching out after radiofrequency-induced shrinkage.
Wolfgang Pötzl; Kai-Axel Witt; Lars Hackenberg; Till Heusner; Joern Steinbeck
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Publication Detail:
Type:  Comparative Study; Journal Article; Research Support, Non-U.S. Gov't    
Journal Detail:
Title:  The American journal of sports medicine     Volume:  31     ISSN:  0363-5465     ISO Abbreviation:  Am J Sports Med     Publication Date:    2003 Jan-Feb
Date Detail:
Created Date:  2003-01-17     Completed Date:  2003-04-22     Revised Date:  2006-11-15    
Medline Journal Info:
Nlm Unique ID:  7609541     Medline TA:  Am J Sports Med     Country:  United States    
Other Details:
Languages:  eng     Pagination:  36-40     Citation Subset:  IM    
Copyright Information:
Copyright 2003 American Orthopaedic Society for Sports Medicine
Department of Orthopaedic Surgery, University Hospital Münster, Münster, Germany.
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MeSH Terms
Catheter Ablation / methods*
Immobilization / physiology*
Patella / surgery*
Postoperative Care / methods
Risk Factors
Tendons / physiology*,  surgery*
Time Factors

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine

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