Ossur Formfit Thumb Spica Splint – De Quervain's, CMC Joint & Thumb Stabilizer Brace
The Ossur Formfit Thumb Spica Splint is a clinically designed thumb stabilizer brace that immobilizes the thumb and wrist to support healing from De Quervain's tenosynovitis, CMC joint arthritis, Gamekeeper's Thumb, selected scaphoid-related injuries when prescribed by a clinician, and thumb sprains. Available in Left and Right versions in sizes XS through XL, with a moldable stay system for a customized fit. This is the sized version — for a one-size-fits-most option, see the Formfit Universal Thumb Spica.
Sized vs. Universal — Which should I choose?
- This splint (Sized, Left/Right) — Best when a precise fit is needed. Available XS–XL with wrist circumference sizing.
- Universal version — Universal-size alternative sold in separate Left and Right versions. Confirm the correct hand before ordering; Universal refers to the size range, not the side.
Size Chart — Measure Your Wrist
Measure around the wrist at the styloid (bony prominence), with the tape flat and not overly tight. Use the inch ranges from Össur’s U.S. sizing chart to select a size; centimeter ranges are shown underneath for reference. Manufacturer inch ranges are rounded, so if your wrist measures near a size boundary, compare the centimeter value or ask a qualified practitioner for fitting guidance. Select the correct Left or Right version.
| Size | Wrist Circumference (inches / cm) | Left Part No. | Right Part No. |
|---|---|---|---|
| X-Small |
5–6 inches (13–16 cm) |
3020 | 3120 |
| Small |
6–7 inches (16–18.5 cm) |
3030 | 3130 |
| Medium |
7–8 inches (18.5–20.5 cm) |
3050 | 3150 |
| Large |
8–9 inches (20.5–23.5 cm) |
3070 | 3170 |
| X-Large |
9–10 inches (23.5–25.5 cm) |
3080 | 3180 |
Clinical Indications (as prescribed)
- De Quervain's tenosynovitis
- CMC joint arthritis (basal thumb arthritis)
- Gamekeeper's Thumb (selected UCL sprains; suspected complete tears require clinical evaluation)
- Selected scaphoid-related injuries only when prescribed by a clinician
- Thumb and wrist sprains/strains
- Post-cast healing and protection
Features & Benefits
- Breathable, lightweight material — comfortable for all-day wear
- Anatomical contour fit — shaped to the natural curve of the thumb and wrist
- Moldable positional stays — dorsal and palmar stays customize the fit
- Quick-pull close strap — easy one-handed donning and doffing
- Contact closure straps — secure, adjustable compression
- Left & Right specific — anatomically correct fit for each hand
- XS through XL sizing — precise fit across a wide range of wrist sizes
Potential HCPCS codes: L3807 for qualifying professional custom fitting or L3809 for an off-the-shelf device requiring only minimal adjustment. Selection depends on the fitting performed and payer documentation; coverage is not guaranteed. FSA/HSA eligibility depends on your plan.
Shipping: Manufacturer processing may add time before carrier acceptance, even on expedited orders. Transit estimates begin after carrier pickup; we will contact you about a reported backorder or other supplier delay.
OrthoTape.com is an authorized Ossur dealer. Authentic product. 6-month manufacturer warranty. Use as directed by a licensed healthcare provider.
How to Fit the Össur Formfit Thumb Spica Splint
Watch the official Össur Academy fitting tutorial for this sized Formfit Thumb Spica brace. Select the correct left or right version and wrist circumference size before fitting. Follow any individualized instructions from your healthcare professional.
Video courtesy of Össur Academy. This tutorial demonstrates the sized Formfit Thumb Spica, not the separate Formfit Universal Thumb model.
Frequently Asked Questions
What is De Quervain's tenosynovitis and how does a thumb splint help?
De Quervain's tenosynovitis involves irritated tendons along the thumb side of the wrist. A thumb spica may restrict painful wrist and thumb motions while following a clinician-directed plan. Relief and treatment duration vary.
What is CMC joint arthritis (basal thumb arthritis) and can a splint relieve the pain?
CMC arthritis affects the joint at the base of the thumb and can make gripping or pinching painful. When recommended by a clinician, a thumb spica may support the joint and reduce painful movement. The appropriate brace and fit depend on the individual.
What is Gamekeeper's Thumb and when is a thumb splint required?
Gamekeeper's Thumb (Skier's Thumb) involves injury to the thumb's ulnar collateral ligament. A clinician may recommend splinting for selected sprains. Severe instability or a possible complete ligament tear requires prompt assessment; this product is not appropriate for every injury.
How long do I need to wear a thumb splint, and can I remove it during the day?
Wear time and any permitted removal depend on your diagnosis and treatment plan. Follow your physician's or hand therapist's instructions for immobilization, hygiene and activities. There is no universal number of weeks appropriate for every patient.
What is a scaphoid fracture and why does it require a thumb spica splint?
The scaphoid is a small wrist bone near the base of the thumb. Suspected or diagnosed fractures require appropriate professional assessment and immobilization. This Formfit Thumb Spica may be used only for selected scaphoid-related injuries when the treating clinician confirms it is suitable; it is not a substitute for prescribed fracture care.
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