Document Detail

Supraspinatus tendon repair into a bony trough in the rabbit: mechanical restoration and correlative imaging.
MedLine Citation:
PMID:  19953603     Owner:  NLM     Status:  MEDLINE    
Recurrence of tears is a common complication after rotator cuff surgery. Retearing seems to occur early after surgery and may be attributed to too early or too vigorous exercises. We found no experimental data correlating the strength of the rotator cuff early after surgery and imaging. Our objectives were to measure the peak load to failure of rabbit supraspinatus tendon-bone constructs at early times postoperatively, to determine their mode of failure, and to determine whether computed tomography (CT) can predict their strength. We divided one supraspinatus tendon of 40 adult female white New Zealand rabbits and, after resection of the enthesis, sutured the tendon into a bony trough. Ten rabbits were killed immediately and 10 each at 1, 2, and 6 weeks postoperatively. The explanted tendons of both shoulders were imaged on CT and tested to failure. Compared to normal tendons (mean 210 +/- 42 N), the mean strength was very low at 0 weeks (57 +/- 21 N) and 1 week (86 +/- 33 N) (both p < 0.05); it had recovered by 6 weeks (324 +/- 66 N). Early on, suture pullout was the most common mode of failure, whereas at 6 weeks, mid-substance tears predominated (p < 0.05). Hypoattenuation on CT was associated with increased strength of the tendon-bone construct (p < 0.05). The strength of the surgical construct is very low in the early postoperative period. Therefore, the shoulder should be submitted only to loads not interfering with healing.
Guy Trudel; Nanthan Ramachandran; Stephen E Ryan; Kawan Rakhra; Hans K Uhthoff
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Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't    
Journal Detail:
Title:  Journal of orthopaedic research : official publication of the Orthopaedic Research Society     Volume:  28     ISSN:  1554-527X     ISO Abbreviation:  J. Orthop. Res.     Publication Date:  2010 Jun 
Date Detail:
Created Date:  2010-04-21     Completed Date:  2010-05-04     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  8404726     Medline TA:  J Orthop Res     Country:  United States    
Other Details:
Languages:  eng     Pagination:  710-5     Citation Subset:  IM    
Copyright Information:
(c) 2009 Orthopaedic Research Society. Published by Wiley Periodicals, Inc.
Bone and Joint Laboratory, University of Ottawa, Ottawa, Ontario, Canada.
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MeSH Terms
Rotator Cuff / physiopathology,  radiography,  surgery*
Suture Techniques
Tensile Strength
Tomography, X-Ray Computed
Treatment Failure
Grant Support
MOP-81395//Canadian Institutes of Health Research

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