Written and maintained by CASRAI Editorial Board
Last updated
This page describes products and general use; it is not medical advice.
A finger splint is a device that holds a finger still. The main types are frog, foam-backed aluminum, U-shaped, gutter, stack and buddy-style supports, and they differ mainly in which joints they hold. This guide is for clinic staff, buyers and students who need to tell the types apart, and it lines up each type with what clinical references say it holds.
What Is a Finger Splint?
A finger splint is a medical device that stabilizes a finger and holds it in one position. Providers also call it a finger brace or an orthosis (Cleveland Clinic, checked 2026-10-30). Clinicians, therapists and patients use it, and the provider, not the product page, decides which type is used. For the wider product class, see what a splint is.
Finger Splint Types
The table lists each type with what the cited reference states about it.
| Type | What the reference says it holds or is used for | Source |
|---|---|---|
| Frog (prefabricated, curved) | Applied to the volar (palm-side) surface of the finger. Prefabricated splints of this kind usually immobilize only the interphalangeal joints; some have wings that are bent over to hold them in place. | Merck Manual Professional |
| Foam-backed malleable aluminum | Cut and bent to fit from a flat aluminum-foam strip. Used when the metacarpophalangeal (MCP) joint must also be immobilized. | Merck Manual Professional |
| U-shaped aluminum | Described as useful for distal phalanx fractures; protects the fingertip. | Merck Manual Professional |
| Gutter | Used for some injuries, such as angulated or unstable proximal phalanx fractures, that need the metacarpals and wrist immobilized as well. Cleveland Clinic also lists an ulnar gutter type. | Merck Manual Professional; Cleveland Clinic |
| Two-finger (buddy) | Buddy-taping is described as another tool for minor finger sprains. See buddy tape for materials and limits. | Merck Manual Professional; Cleveland Clinic |
| Stack, dynamic, thumb spica | Named by Cleveland Clinic as splint types. | Cleveland Clinic |
| Oval-8 style | A ring-style splint described in an NHS trust leaflet as used to relieve pain, improve hand function and grip, and support and realign joint position. It can cover several fingers. | Northern Devon Healthcare NHS Trust, Leaflet 495 |
Who uses it: clinicians who treat finger injuries, occupational therapists, and patients following a provider’s instructions.
How Finger Splints Are Built
Cleveland Clinic describes a rigid shell, made of metal or plastic, usually lined with foam or padded fabric to help prevent pressure sores. Most are adjustable with Velcro, fabric straps or tape and are typically pre-made rather than custom-fit. Malleable splints use a foam-backed aluminum strip that is cut and bent to shape, and cut edges can be covered with cloth tape, according to Merck Manual Professional. Custom thermoplastic splints, such as the thimble splint in the trial below, are made for the individual. For a related thermoplastic material, see Aquaplast.
What One Mallet-Finger Trial Compared
One multicenter randomized trial of 64 patients with acute mallet finger (types 1a and 1b) compared three splints: a prefabricated stack splint, a dorsal padded aluminum splint and a custom-made thermoplastic thimble splint (O’Brien and Bailey, Arch Phys Med Rehabil 2011;92(2):191-8, PMID 21272714). Extensor lag did not differ between groups at 12 or 20 weeks. Treatment failure was 23.8% in both the stack and the aluminum groups and none in the thermoplastic group (P=.04). This is one trial of one injury, and it does not rank splints for other injuries.
How to Use a Finger Splint: Provider-Directed Use
A finger splint is used as the provider directs: the provider chooses the type and instructs its use, and this page gives no application steps or wear schedules (Cleveland Clinic). Cleveland Clinic names skin irritation, pressure sores, nerve impingement and infection as risks. One NHS trust leaflet for an oval-8 splint gives cleaning as warm soapy water and wiping dry, and says a prescribed splint is not to be used by another person. Its review date has passed, so treat it as an example of trust guidance.
How FDA Classifies Hand Splints
In the openFDA device classification database (index last updated 2026-10-19, queried 2026-10-30), product code ILH, “Splint, Hand, And Components”, is class 1 under 21 CFR 890.3475. Product codes FYH and NOC, the sterile and non-sterile external noninflatable extremity splints, are class 1 under 21 CFR 878.3910. Prefabricated splints are covered by 21 CFR 890.3025, which also lists class 1 codes. This describes the product code, not the status of any specific brand.
Common Mistakes
- Choosing by name alone: the references tie each type to the joints it holds and the injury, so a frog splint that holds only the interphalangeal joints is not a substitute for a gutter splint.
- Assuming a regulatory class applies to a specific brand: the FDA class is a product-code fact, not a brand claim.
FAQ
What is a finger splint?
A finger splint is a medical device that stabilizes a finger and holds it in one position. It is also called a finger brace or orthosis, and most have a rigid metal or plastic shell with padding (Cleveland Clinic, checked 2026-10-30).
How do you use a finger splint?
Use is set by the provider, who chooses the type and gives the instructions. This page describes the products and does not give application steps or wear schedules. See the provider-directed use section above for the sourced handling points.
Sources
- Merck Manual Professional, How to Apply a Fixed Finger Splint, checked 2026-10-30.
- Cleveland Clinic, Finger Splint, checked 2026-10-30.
- O’Brien L, Bailey M. Arch Phys Med Rehabil 2011;92(2):191-8, PubMed 21272714, checked 2026-10-30.
- Northern Devon Healthcare NHS Trust, How to use and care for your oval 8 finger splint (Leaflet 495), checked 2026-10-30.
- U.S. FDA, openFDA device classification, checked 2026-10-30.
Related: carpal tunnel splint.
