The left hand of a middle-aged man with a mallet finger injury to the middle finger. The injury, caused by a sudden jolt to the finger while the finger is being used sees the tendon connecting the upper finger joint to rupture, causing the end of the finger to droop and not straighten when the hand is stretched. Treatment requires the finger to be put in a splint for six to eight weeks until the tendon heals. The splint shown here is custom made for the individual from a breathable thermoplastic-wood material, marketed as 'Woodcast'. The material is cut to shape, heated to make it pliable, them moulded to the injured limb and allowed to set.