Mallet finger is a rupture of the tendon at the tip of the finger, which causes the tip of the finger to drop or bend downward, creating a mallet shape. It is usually not painful unless a piece of bone is broken as well. Mallet finger can be caused by a direct blow to the finger and commonly affects athletes.
Nail bed injuries often occur when fingers are crushed, causing the bone beneath the nail to fracture, a cut to the nail bed itself, or, simply, a tremendous bruise. These injuries tend to cause hematomas, blood pooled under the nail that appears black or blue. The pressure of the blood can be very painful and, in some cases, permanent deformity can result. The pain can be reduced by having the blood drained by a physician.
Skier's and goalkeeper's thumb, the most common of all ligament tears, is a tear of the ligament at the base of the thumb where it meets the palm. Skier's/goal keeper's thumb is usually caused by falling on an outstretched hand and thumb. Nonsurgical treatment involves splinting and casting, but surgery may be required to repair the tear.