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Weight-bearing asymmetry and vertical activity differences in a rat model of post-traumatic knee osteoarthritis.

Abstract：

OBJECTIVE:This study used a rat model of post-traumatic knee osteoarthritis (OA) created by anterior cruciate ligament transection with partial medial meniscectomy (ACLT + pMMx). In this model, mild to moderate structural changes that are typical of knee OA have been observed within 2 and 8 weeks post-surgery. We aimed to determine whether pain-related behaviours can distinguish between an ACLT + pMMx and a sham surgery group. DESIGN:Three-month old male Sprague-Dawley rats underwent ACLT + pMMx on their right hindlimb within two groups of n = 6 each, and sham surgery within two groups of n = 5 each. Assessments evaluated percent ipsilateral weight-bearing for static weight-bearing and 18 different variables of exploratory motor behaviour at multiple time points between 1 and 8 weeks post-surgery. Histology was performed on the right hindlimbs at 4 and 8 weeks post-surgery. RESULTS:Histology confirmed mild to moderate knee OA changes in the ACLT + pMMx group and the absence of knee OA changes in the sham group. Compared to the sham group, the ACLT + pMMx group had significantly lower percent ipsilateral weight-bearing from 1 through 8 weeks post-surgery. Compared to the sham group, the ACLT + pMMx group had significantly lower vertical activity (episode count, time, and count) values. CONCLUSIONS:These findings suggest that ipsilateral weight-bearing deficit and vertical activity limitations resulted from the presence of knee OA-like changes in this model. When using the ACLT + pMMx-induced rat model of knee OA, percent ipsilateral weight-bearing and vertical activity distinguished between rats with and without knee OA changes. These variables may be useful outcome measures in preclinical research performed with this experimental post-traumatic knee OA model.

journal_name

Osteoarthritis Cartilage

journal_title

Osteoarthritis and cartilage

authors

Hamilton CB,Pest MA,Pitelka V,Ratneswaran A,Beier F,Chesworth BM

doi

10.1016/j.joca.2015.03.001

subject

Has Abstract

pub_date

2015-07-01 00:00:00

pages

1178-85

issue

7

eissn

1063-4584

issn

1522-9653

pii

S1063-4584(15)00833-X

journal_volume

23

pub_type

杂志文章

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