View clinical trials related to Ligament; Laxity.
Filter by:The purpose of this study is to assess correlation between recurrent patella dislocation and genetic polymorphism rs1800012 of the COL1A1 Gene and rs12722 of the COL5A1 Gene.
Women's participation in sports at all levels has been increasing in recent decades. Many individual and team sports are at risk of anterior cruciate ligament (ACL) injury. This injury leads to a permanent or long-lasting interruption of sports practice and to significant medical and economic expenses. Women are recognized as being more at risk of anterior cruciate ligament injury with a risk 6 times higher than men. Hyperlaxity is a risk factor for anterior cruciate ligament injury, but the pathophysiological bases are little studied. Hormonal impregnation and certain periods of the menstrual cycle (ovulatory phase) are risk factors for anterior cruciate ligament injury. It therefore seems interesting to investigators to study the influence of hormonal impregnation on ligament laxity. To date no study has investigated such a relationship.
The proposed research will focus on determining the effect of methylsulfonylmethane (MSM) on knee laxity changes through the menstrual cycle in young active females. As an extension to recent discovery, that MSM reverses the negative effect of estrogen on engineered ligament function, the proposed work is designed to determine whether MSM can decrease the negative effect of estrogen on knee laxity in females. Ligament function is determined by the content and cross-linking of collagen, which is influenced by a milieu of biochemical and mechanical parameters. The greater the amount and cross-linking the greater the stiffness and strength of these connective tissues. In engineered ligaments it has been previously shown that the high levels of estrogen, normally present in the days before and after ovulation, can inhibit the cross-linking enzyme lysyl oxidase. This decrease in collagen cross-linking likely increases connective tissue laxity and contributes to observed 4-fold greater occurrence of anterior cruciate ligament (ACL) rupture in females. Conversely, MSM increases collagen cross-linking and recent work conducted by the Baar lab in engineered human ligaments treated with high estrogen demonstrated that MSM could completely reverse the effects of estrogen on ligament mechanics. The proposed research aims to advance this promising pre-clinical data and apply in a clinical trial. This research also proposes to quantify that knee laxity increases up to 5mm between the first day of menstruation and the day after ovulation and also that the magnitude of the increase in laxity is directly related to the magnitude of the change in estrogen. Importantly, a direct relationship between knee laxity and ACL rupture exists. For every 1.3mm increase in anterior-posterior knee displacement, the odds of ACL rupture increase 4-fold. Therefore, any treatment that decreases knee laxity could be expected to reduce ACL ruptures and have widespread application across the general active population and high-level athletics.