A finger gutter splint is a narrow trough along one side of a finger that holds one or two joints straight. A PIP extension splint is a gutter aimed at the MIDDLE JOINT, holding it straight while the other joints stay free.
Gutters are used for stable finger fractures and after finger surgery and these PIP extension splints are used for boutonniere injuries and for middle joints that have stiffened into a bend.
The rule for both: hold only the joints that need holding, for only as long as they need it.
Why the middle joint gets special attention
- The PIP joint is the finger joint most prone to stiffness. A few weeks held bent can leave a lasting bend. See finger joint anatomy
- Holding it straight is safer than holding it bent, because a straight joint is easier to bend again later than a bent one is to straighten
- Holding it when it doesn’t need holding costs movement you may not fully get back
Every joint inside a splint is a joint that has to be rehabbed afterwards. Include only the ones that must be there.
The versions
- Volar gutter: on the palm side. Common after finger fractures and surgery
- Dorsal gutter: on the back of the finger. Leaves the pad free for touch
- PIP extension splint: middle joint straight, fingertip joint free to bend. The standard splint for a central slip or boutonniere injury
- Serial static PIP splint or cast: remolded or recast every few days as a bent middle joint gradually straightens
- Capener splint: a spring-wire design that applies gentle straightening force during the day while the finger still bends
What they’re used for
- Stable finger fractures without rotation
- After finger surgery, such as fracture fixation or Dupuytren’s release
- Boutonniere injury: middle joint straight for around 6 weeks, fingertip joint bending freely throughout
- PIP flexion contractures, including those after PIP sprains and long immobilization
A typical boutonniere timeline
- Weeks 0 to 6: PIP splint on day and night. Bend the fingertip joint many times a day with the middle joint held straight
- Weeks 6 to 8: gentle middle joint bending begins. Splint at night and for risky tasks
- Weeks 8 to 12: splint weaned while the joint holds straight on its own
If the middle joint starts to droop as bending increases, the program slows down. That droop is the early warning.
Problems to watch for
- Pressure on the knuckle of the middle joint, where skin is thin
- Swelling making the straps cut in
- Sweaty, soft skin under the splint. Dry it and change the padding
- Taking a boutonniere splint off “just for a minute” and letting the joint bend
Get it checked if
- A finger that crosses its neighbor when you make a fist
- The middle joint drooping more each week
- Numbness, color change or skin breakdown
This is one of dozens of splints a hand therapist makes. See what a hand therapist does for the full list.
Hold only what must be held, and keep everything else moving.
Every article on this site is written using the Closing Window Method: name the window your condition runs on, find where you are in it, and act while it’s still open.