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Gait analysis is one method used to evaluate both preclinical OA models and OA patients. The objective of this study is to describe spatiotemporal and ground reaction force changes in a rat medial meniscus transection (MMT) model of knee OA and to compare these gait measures with assays of weight bearing and tactile allodynia.<\/jats:p>\n                     <\/jats:sec><jats:sec>\n                        <jats:title>Methods<\/jats:title>\n                        <jats:p>Sixteen rats were used in the study. The medial collateral ligament (MCL) was transected in twelve Lewis rats (male, 200 to 250 g); in six rats, the medial meniscus was transected, and the remaining six rats served as sham controls. The remaining four rats served as na\u00efve controls. Gait, weight-bearing as measured by an incapacitance meter, and tactile allodynia were assessed on postoperative days 9 to 24. On day 28, knee joints were collected for histology. Cytokine concentrations in the serum were assessed with a 10-plex cytokine panel.<\/jats:p>\n                     <\/jats:sec><jats:sec>\n                        <jats:title>Results<\/jats:title>\n                        <jats:p>Weight bearing was not affected by sham or MMT surgery; however, the MMT group had decreased mechanical paw-withdrawal thresholds in the operated limb relative to the contralateral limb (<jats:italic>P<\/jats:italic> = 0.017). The gait of the MMT group became increasingly asymmetric from postoperative days 9 to 24 (<jats:italic>P<\/jats:italic> = 0.020); moreover, MMT animals tended to spend more time on their contralateral limb than their operated limb while walking (<jats:italic>P<\/jats:italic> &lt; 0.1). Ground reaction forces confirmed temporal shifts in symmetry and stance time, as the MMT group had lower vertical and propulsive ground reaction forces in their operated limb relative to the contralateral limb, na\u00efve, and sham controls (<jats:italic>P<\/jats:italic> &lt; 0.05). Levels of interleukin 6 in the MMT group tended to be higher than na\u00efve controls (<jats:italic>P<\/jats:italic> = 0.072). Histology confirmed increased cartilage damage in the MMT group, consistent with OA initiation. <jats:italic>Post hoc<\/jats:italic> analysis revealed that gait symmetry, stance time imbalance, peak propulsive force, and serum interleukin 6 concentrations had significant correlations to the severity of cartilage lesion formation.<\/jats:p>\n                     <\/jats:sec><jats:sec>\n                        <jats:title>Conclusion<\/jats:title>\n                        <jats:p>These data indicate significant gait compensations were present in the MMT group relative to medial collateral ligament (MCL) injury (sham) alone and na\u00efve controls. Moreover, these data suggest that gait compensations are likely driven by meniscal instability and\/or cartilage damage, and not by MCL injury alone.<\/jats:p>\n                     <\/jats:sec>","DOI":"10.1186\/ar3801","type":"journal-article","created":{"date-parts":[[2012,4,17]],"date-time":"2012-04-17T16:17:08Z","timestamp":1334679428000},"update-policy":"https:\/\/doi.org\/10.1007\/springer_crossmark_policy","source":"Crossref","is-referenced-by-count":64,"title":["Kinematic and dynamic gait compensations resulting from knee instability in a rat model of osteoarthritis"],"prefix":"10.1186","volume":"14","author":[{"given":"Kyle D","family":"Allen","sequence":"first","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Brian A","family":"Mata","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Mostafa A","family":"Gabr","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Janet L","family":"Huebner","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"suffix":"Jr","given":"Samuel B","family":"Adams","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Virginia B","family":"Kraus","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Daniel O","family":"Schmitt","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Lori A","family":"Setton","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"297","published-online":{"date-parts":[[2012,4,17]]},"reference":[{"key":"3556_CR1","volume-title":"Osteoarthritis, Inflammation, and Degradation: a Continuum","author":"JA Buckwalter","year":"2007","unstructured":"Buckwalter JA, Lotz M, Stoltz JF: Osteoarthritis, Inflammation, and Degradation: a Continuum. 2007, Amsterdam: IOS Press"},{"key":"3556_CR2","doi-asserted-by":"publisher","first-page":"88","DOI":"10.2519\/jospt.1998.28.2.88","volume":"28","author":"EM Roos","year":"1998","unstructured":"Roos EM, Roos HP, Lohmander LS, Ekdahl C, Beynnon BD: Knee Injury and Osteoarthritis Outcome Score (KOOS): development of a self-administered outcome measure. 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