Document Detail

Mechanical properties of the anterior cruciate ligament chronically relaxed by elevation of the tibial insertion.
MedLine Citation:
PMID:  8618159     Owner:  NLM     Status:  MEDLINE    
The effects of stress deprivation on the mechanical properties of the anterior cruciate ligament were studied in a canine model. Fifty-eight mature mongrel dogs were divided into two groups. In the relaxed group (n = 30), the tibial insertion of the anterior cruciate ligament in each right knee was surgically elevated proximally 3 mm from the tibia; the elevation was anatomically reduced in the sham group (n = 28). In order to obtain control data, the left knee in each dog was left untreated. A femur-anterior cruciate ligament-tibia complex was excised from each knee for biomechanical tests at 6 or 12 weeks after surgery. To simplify data analysis, the treat/nontreat ratio (the ratio of the data obtained from the treated knee to that from the nontreated knee) was used. The cross-sectional area of the ligament increased significantly in both groups; the area in the relaxed group (average treat/nontreat ratio = 1.37) was significantly larger than that in the sham group (1.16) at 6 weeks but not at 12 weeks. The treat/nontreat ratio of tensile strength in the relaxed group significantly decreased to 0.67 and 0.58 at 6 and 12 weeks, respectively; in the sham group, it significantly decreased to 0.79 at 6 weeks but subsequently increased to 0.87 at 12 weeks. Only at 12 weeks was a significant difference observed between the two groups. This study demonstrated that, in the anterior cruciate ligament, stress deprivation results in a rapid increase in the cross-sectional area, although this effect disappears by 12 weeks, and in a decrease in mechanical strength, although a relatively long period of more than 6 weeks is required for the deterioration.
M Keira; K Yasuda; K Kaneda; N Yamamoto; K Hayashi
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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:  14     ISSN:  0736-0266     ISO Abbreviation:  J. Orthop. Res.     Publication Date:  1996 Jan 
Date Detail:
Created Date:  1996-06-12     Completed Date:  1996-06-12     Revised Date:  2006-11-15    
Medline Journal Info:
Nlm Unique ID:  8404726     Medline TA:  J Orthop Res     Country:  UNITED STATES    
Other Details:
Languages:  eng     Pagination:  157-66     Citation Subset:  IM    
Department of Orthopaedic Surgery, Hokkaido University School of Medicine, Sapporo, Japan.
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MeSH Terms
Anterior Cruciate Ligament / physiology*
Collagen / physiology
Equipment Design
Tibia / physiology*
Time Factors
Reg. No./Substance:

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