Wrist Brace for Scapholunate Ligament Injury: Sizing and Fit Guide

A scapholunate ligament injury needs a brace matched to its severity — motion-limiting for unstable wrists, not a stretchy sleeve.

A wrist that clicks when you push up from a chair, or gives way under a loaded barbell, needs a measurement rather than a wrap. Choosing a wrist brace for scapholunate ligament injury comes down to two things: how unstable the joint is, and whether the brace matches the circumference right where the wrist and palm meet. Get either one wrong and the fabric stops being support.

Below sits the injury-stage logic, the four-size sizing chart, the manufacturer’s placement rules, and the fit errors that send most braces back.

What Kind Of Brace Does A Scapholunate Ligament Injury Need?

Brace type follows injury grade. Acute or unstable scapholunate injuries usually need clinician-directed immobilization — a short-arm or thumb-spica cast or orthosis — while a stable partial injury cleared for movement can use a motion-limiting activity brace.

A 2025 review of scapholunate ligament injury treatment reports that Geissler grade I–II injuries are managed with spica-cast immobilization, and grade III injuries may need temporary K-wire fixation followed by casting. A flexible activity brace is the wrong tool for an unstable wrist, because it permits the exact motion the cast exists to block.

Duration isn’t a do-it-yourself call. A University of Wisconsin–Milwaukee rehab guide on scapholunate injury reports acute immobilization lasting up to 8 weeks, individualized by grade and patient. Whether motion is allowed at all is a hand surgeon’s or certified hand therapist’s call.

Sizing A Wrist Brace For Scapholunate Injury: What Decides The Fit

Fit rests on one measurement: the circumference around the wrist where the wrist and palm meet, taken on the injured hand. Measure at that crease, not across the knuckles or up the forearm, and order the correct left or right version.

BraceLab’s WriStable Wrist Brace builds carpal support into the shell. Its adjustable strap sets how much support and end-range motion you get, and a narrow strap sits distal to the radial and ulnar styloids while leaving functional wrist motion available. The manufacturer lists scapholunate instability, dorsal impingement or abutment, hypermobility, and weight-bearing wrist pain among the indications.

Wrists measuring under 4 inches or over 8 inches fall outside the chart, so ask the clinic for an alternative instead of guessing.

How Do You Put The WriStable On Correctly?

The WriStable goes on with the larger piece on top of the wrist, the WriStable text upright, and the narrow strap sitting in the groove beyond the forearm bones, distal to the radial and ulnar styloids.

1. Open the strap-closure tabs and the cam buckle.
2. Slide the brace over the hand, larger piece on top of the wrist, WriStable text reading upright.
3. Set that larger piece near the thumb, between the bases of the index and middle fingers.
4. Lay the strap in the wrist groove beyond the forearm bones and distal to the radial and ulnar styloids.
5. Hold the wrist straight while you tighten the strap, then close the cam buckle.
6. Wrap the remaining strap gently around the wrist.
7. Press the closure tabs down, and trim excess strap only once length is confirmed — leave at least four or five tabs.

It’s seated correctly when the strap rests in the hollow past the wrist bones, the top piece angles thumb-side, and a slow fist doesn’t make the strap bite.

• Reversing hands. A right brace on a left wrist throws off the carpal support, so order by hand as well as size.
• Measuring across the knuckles. Measure the crease where wrist and palm meet — the knuckle and forearm numbers run high.
• Parking the strap on a styloid. A strap sitting directly on the radial or ulnar styloid becomes a pressure point, not support.
• Tightening with the wrist flexed. Keep it straight during application or you lock in a painful position.
• Chasing extra snugness. Numbness, tingling, color change, swelling, or climbing pain means too tight, not more support.

Daytime use covers push-ups, yoga, gymnastics, and other weight-bearing tasks that provoke symptoms. The instructions say not to sleep in the WriStable; overnight support calls for a wrist-immobilization brace instead. Cleveland Clinic’s guidance on wrist splints notes the treating provider sets how often and how long a splint is worn, the same caveat that hangs over the 8-week acute window above.

If you’re weighing this against other designs, our roundup of the best brace for a scapholunate ligament tear compares the options that hold the carpus under load.

Tenderness over the scapholunate interval that won’t settle, clicking, weakness, deformity, or pain that climbs after a fall needs an exam. No off-the-shelf brace treats every tear, fracture, dislocation, post-op restriction, or full rupture.