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Influence of postoperative immobilization on tendon length after radiofrequency-induced shrinkage: an in vivo rabbit study.

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Title: Influence of postoperative immobilization on tendon length after radiofrequency-induced shrinkage: an in vivo rabbit study.
Authors: Pötzl W (AUTHOR), Witt K (AUTHOR), Hackenberg L (AUTHOR), Heusner T (AUTHOR), Steinbeck J (AUTHOR)
Source: American Journal of Sports Medicine. Jan/Feb2003, Vol. 31 Issue 1, p36-40. 5p.
Abstract: 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. [ABSTRACT FROM AUTHOR]
Copyright of American Journal of Sports Medicine is the property of Sage Publications Inc. and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)
Database: Education Research Complete
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  Data: Influence of postoperative immobilization on tendon length after radiofrequency-induced shrinkage: an in vivo rabbit study.
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  Data: <searchLink fieldCode="AR" term="%22Pötzl+W%22">Pötzl W</searchLink> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Witt+K%22">Witt K</searchLink> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Hackenberg+L%22">Hackenberg L</searchLink> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Heusner+T%22">Heusner T</searchLink> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Steinbeck+J%22">Steinbeck J</searchLink> (AUTHOR)
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  Data: <searchLink fieldCode="JN" term="%22American+Journal+of+Sports+Medicine%22">American Journal of Sports Medicine</searchLink>. Jan/Feb2003, Vol. 31 Issue 1, p36-40. 5p.
– Name: Abstract
  Label: Abstract
  Group: Ab
  Data: 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. [ABSTRACT FROM AUTHOR]
– Name: AbstractSuppliedCopyright
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  Data: <i>Copyright of American Journal of Sports Medicine is the property of Sage Publications Inc. and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract.</i> (Copyright applies to all Abstracts.)
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              Text: Jan/Feb2003
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