Document Detail

Serial magnetic resonance imaging of hamstring anterior cruciate ligament autografts during the first year of implantation. A preliminary study.
MedLine Citation:
PMID:  2008929     Owner:  NLM     Status:  MEDLINE    
A prospective, observational study was performed to document the serial changes in the magnetic resonance signal of devascularized, hamstring ACL autografts during the 1st year of implantation. Twenty-one ACL deficient knees (14 chronic, 7 acute) were reconstructed. Instability developed in five knees within the first 6 months of graft implantation (24%). Magnetic resonance examinations were performed at 1, 6, 12, 24, 36, and greater than 48 weeks postoperatively (repetition time 1500, echo delay time = 50). A total of 104 scans were reviewed (average, five per knee). The ACL graft was divided into four unequal size zones for analysis. The proximal, middle, and distal thirds of the intraarticular portion of the graft and the portion of the graft within the tibial tunnel were independently analyzed. The magnetic resonance signal in each portion of the graft was graded on a scale with (I) being a normal signal, (II) greater than 50% of the total volume of the graft having a normal signal, (III) less than 50% of the graft having a normal signal, and (IV) 100% of the graft having an increased signal. The increased magnetic resonance signal of the ACL graft was observed to be regionalized and confined to the distal two-thirds of the intraarticular portion of the graft. The portion of the graft exiting the femoral tunnel and within the tibial tunnel retained a normal magnetic resonance signal. The increases in magnetic resonance graft signal were time-dependent, became well established by 3 months, and remained unchanged at 1 year. The clinical outcome could not be predicted based on the magnetic resonance signal of the graft.
S M Howell; J A Clark; R D Blasier
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Publication Detail:
Type:  Journal Article    
Journal Detail:
Title:  The American journal of sports medicine     Volume:  19     ISSN:  0363-5465     ISO Abbreviation:  Am J Sports Med     Publication Date:    1991 Jan-Feb
Date Detail:
Created Date:  1991-05-01     Completed Date:  1991-05-01     Revised Date:  2004-11-17    
Medline Journal Info:
Nlm Unique ID:  7609541     Medline TA:  Am J Sports Med     Country:  UNITED STATES    
Other Details:
Languages:  eng     Pagination:  42-7     Citation Subset:  IM    
Travis Air Force Base, California.
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MeSH Terms
Anterior Cruciate Ligament / pathology*,  surgery
Joint Instability / pathology,  surgery
Magnetic Resonance Imaging*
Postoperative Complications / diagnosis*
Prospective Studies
Tendons / transplantation*

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

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