Some conditions associated with hyperextensibility of joints are: Marfans syndrome Ehler's - Danlos syndrome Stickler syndrome Homocystinuria Primary hyperparathyroidism Note: Hyper extensibility of fingers and hands may be seen in Cailage hair hypoplasia, Cutis laya and fragile X syndrome. Hurler's syndrome is associated with stiffness of joints. Ref: Meharban Singh, Edition 3, Page - 137.