Homemade mallet finger splint: what to know

Mallet finger usually follows a forceful bend at the fingertip that injures the extensor tendon; a small bone injury can occur as well. The fingertip may droop and may not actively straighten. An examination and sometimes an X-ray help distinguish tendon injury from fracture or joint displacement. The splint must hold the end joint straight without blocking the middle joint or causing pressure damage.

Keep the fingertip supported in a straight position and arrange prompt assessment. A clean, smooth temporary support can reduce bending, but it should not be tight, numb the finger or cut into the skin. Keep the hand raised if it is swollen. Do not repeatedly remove the support to test the fingertip, because bending can disrupt healing. A clinician can show you how to use formal splinting and how to inspect the skin safely.

Seek urgent care if the finger is blue, cold, numb, severely swollen, visibly crooked, or has an open wound. Arrange prompt review after any injury that leaves the fingertip drooping, particularly if pain or swelling is increasing. If a temporary splint causes pressure marks or loss of sensation, remove pressure safely and obtain advice. Do not drive or work with an unstable support if it could worsen the injury.

Ask whether the tendon, bone or joint is injured; how long the fingertip must stay straight; how to bathe and inspect the skin; and what to do if the finger bends during splint changes. Ask when surgery, including tendon repair surgery, might be considered.