M66.2: Spontaneous rupture of extensor tendons

Spontaneous rupture of extensor tendons, represented by the ICD-10 code M66.2, is a specific medical condition that impacts the muscles responsible for extending, or straightening, your joints, particularly those in the hands, wrists, elbows, and knees. A tear or rupture can occur suddenly without any noticeable injury or trauma, and are commonly referred to as 'spontaneous'. When this happens, you may lose the ability to fully straighten the affected joint effectively, experience pain or swelling, and notice a change in the shape or position of your fingers, wrist, elbow or knee. Tendon ruptures may occur more frequently in individuals who have rheumatoid arthritis or have taken certain medications like steroids, which can weaken tendons. Finally, while the condition is not contagious, it can significantly impair one's daily activities and quality of life due to the limitations on movement.