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A Jewett brace is a thoracolumbar hyperextension orthosis: a rigid frame that uses three pressure points to limit forward bending of the trunk. This page explains how the three-point system works, what the parts are, how it differs from a CASH brace and from a lumbosacral (LSO/TLSO) brace, and how one manufacturer lists its sizes. It is written for clinic staff, buyers and students.
This page describes products and general use; it is not medical advice.
What a Jewett brace is
A Jewett brace is a thoracolumbar hyperextension orthosis. According to a 2020 paper in the ASEAN Journal of Rehabilitation Medicine, its function is to limit truncal flexion and to help reduce the pressure force on the anterior column of the spinal body. The same paper lists light weight and ease of wear as advantages. Spinal orthoses in general serve to restrict spinal motion and stabilise the affected segments.
Who uses it: it is fitted by clinicians, typically a certified prosthetist-orthotist, and worn by patients whose treating clinician has chosen it. Clinic staff, orthotics buyers and rehabilitation students are the usual readers of product information like this.
How the three-point system works
The Jewett brace works on three-point pressure. Two forces act from front to back, at the sternal pad (over the breastbone) and the pubic pad. One force acts from back to front, at the lumbar pad. The pads sit on bony landmarks, and the paper gives the pubic pad landmark as 1 to 2 inches above the pubic symphysis.
A manufacturer description (Orliman) states the same arrangement as three support points: suprapubic, dorsolumbar and sternal. Orliman describes the intended effects as hyperextension through the three-point support, mechanical unloading of the lower thoracic and upper lumbar vertebral bodies, stabilisation and restriction of movement, and pain relief.
Parts and materials
Parts below are from the Orliman product page for its short Jewett hyperextension brace with three-dimensional sternal adjustment (SKU J002G-J002AG). Other makers’ designs differ.
- Frame: lightweight aluminium alloy.
- Sternal support: three-dimensional, adjustable on three axes through pectoral hinges.
- Pelvic (suprapubic) support: articulating, and it can be fixed at an angle for sitting comfort.
- Upper padding: thermoformed foam fabric, removable, with Velcro fastening.
Jewett vs CASH vs LSO/TLSO
The comparison below uses a 1993 University of Iowa doctoral thesis (Gilbertson) that tested Jewett and CASH orthoses with force transducers.
| Finding | Jewett | CASH |
|---|---|---|
| Forces developed in response to external loads on the trunk | Higher | Lower than Jewett |
| What the orthosis limited | Spinal deformation rather than hip rotation | Spinal deformation rather than hip rotation |
| Extension moment at fitting | Applied, increasing with attempted flexion | Applied, increasing with attempted flexion |
| Trunk muscle (EMG) activity with wear | No decrease reported | No decrease reported |
The thesis tested healthy subjects, so the table describes mechanical behaviour, not treatment outcomes. For lumbosacral and thoracolumbosacral orthoses see our guide to the LSO brace; the Jewett design is not covered there.
Sizing as one manufacturer lists it
This table is for one product only (Orliman short Jewett brace, SKU J002G-J002AG). The manufacturer does not state units, so the values are shown as listed. Other makers use different size systems.
| Size | Pelvic circumference | Height |
|---|---|---|
| 2 | 75-90 | 39.5-43.5 |
| 3 | 90-105 | 42-49 |
| 4 | 105-115 | 45.5-52.5 |
Fitting and safe-use basics
In the 2020 study, a certified prosthetist-orthotist adjusted a prefabricated Jewett brace for each participant. Fit depends on the pads sitting on their landmarks, so fitting and adjustment belong to a qualified clinician rather than the wearer. Which patients should wear the brace, and for how long, is a clinical decision. Orliman lists indications for its own product, including compression fractures, stable fractures of the lower dorsal and lumbar spine, post-surgical care after spinal decompression and medium-term immobilisation after disc surgery. Those are the manufacturer’s statements, not a general rule.
What the evidence shows
The 2020 study measured 50 healthy volunteers wearing a prefabricated Jewett brace, using lateral films and Cobb angles from T9 to L3. The authors concluded the brace controlled flexion to less than 10 degrees. Obesity mattered: upright flexion angle was 9.73 degrees (SD 6.14) in obese participants against 3.35 degrees (SD 5.32) in non-obese participants (p<0.001), and in forced flexion 17.89 against 12.80 degrees (p=0.026). The remaining bendable angle after bracing was 9.45 and 8.13 degrees, not significantly different. The authors also noted that their literature review found good biomechanical results but little clinical efficacy in clinical trials, so this is evidence about mechanics in healthy people, not proof of patient benefit.
Common mistakes
- Pad off its landmark. The system depends on the pubic, sternal and lumbar pads sitting on bony landmarks; the pubic pad belongs 1 to 2 inches above the pubic symphysis.
- Ignoring body habitus. The authors reported difficulty fitting the suprapubic pad in severe obesity with excess abdominal fat, and flexion angles were higher in the obese group.
- Treating one maker’s size chart as universal. The table above applies to one product.
- Reading healthy-volunteer results as treatment results. See the evidence section.
FAQ
What is a Jewett brace?
A thoracolumbar hyperextension orthosis that limits forward flexion of the trunk through three pressure points: sternal, lumbar and pubic pads.
What does a Jewett brace do mechanically?
It applies two front-to-back forces (sternal and pubic pads) and one back-to-front force (lumbar pad), which limits truncal flexion and helps reduce pressure on the anterior column of the vertebrae.
How is it different from an LSO or TLSO?
The Jewett is a hyperextension frame built on three-point pressure. LSO and TLSO are broader categories of spinal orthosis; see the LSO brace guide.
Who fits it?
In the cited study, a certified prosthetist-orthotist adjusted the brace to each wearer.
Related reading: what a splint is, crutches, canes and ankle braces and what counts as a medical device.
Sources
- Koonalinthip N, Yotnuengnit P. The Effect of Obesity on Thoracolumbar Flexion Control of Jewett Hyperextension Brace. ASEAN J Rehabil Med. 2020;30(3):103-108. Article PDF. Date checked: 2026-10-30.
- Orliman. Jewett Hyperextension Brace with Three-Dimensional Sternal Adjustment, Short (J002G-J002AG). Product page. Date checked: 2026-10-30.
- Gilbertson LG. Mechanisms of Fracture and Biomechanics of Orthoses in Thoracolumbar Injuries. PhD thesis, University of Iowa, 1993. Abstract. Date checked: 2026-10-30.
