The most common form of tenosynovitis is referred to as idiopathic or stenosing tenosynovitis and includes such processes as trigger finger, trigger thumb, and de Quervain tenosynovitis.  Although many patients with these conditions will attribute their symptoms to overuse, most cases start without a change in activity level, and classification as an overuse injury is likely incorrect. Similarly, although the term tenosynovitis suggests inflammation via the "-itis" suffix, the actual histopathologic findings are noninflammatory and include fibrocartilaginous metaplasia of the retinacular pulley with narrowing of the fibro-osseous canal.