Lacerations to the extensor tendons often occur to those working around sharp objects such as sheet metal, machine parts, or knives. A laceration to one or more of the extensor tendons is a serious injury; a complete cut will leave the individual without the ability to straighten the involved fingers.

Cuts to the back of the hands or fingers should be seen immediately by a physician. If an extensor tendon injury has occurred, surgery is usually required to repair the cut tendon. Immediately following surgery, your physician will normally prescribe hand therapy. A custom splint is frequently requested to provide protection and restrict mobility, and only very limited and specific movements are allowed for the first several weeks to avoid re-injuring the repair. As healing progresses, a program of specific hand exercises and treatments will help regain range of motion, strength, and function to the hand