Written and maintained by CASRAI Editorial Board
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This page describes products and general use; it is not medical advice.
A hip brace is a device worn around the hip or pelvis to support or position the joint. In the United States, a brace that fits the FDA definition of a limb orthosis is a Class I device that does not need FDA premarket notification. For infants, the hip braces most often discussed are abduction braces and harnesses that hold the legs apart. This page is for clinic staff, buyers and students who need to know what the term covers, how the main infant device types differ, and how the products are regulated.
What a hip brace is
“Hip brace” is a general name rather than a single product. FDA’s definition of a limb orthosis (brace) in 21 CFR 890.3475 covers a device “intended for medical purposes that is worn on the upper or lower extremities to support, to correct, or to prevent deformities or to align body structures for functional improvement.” A brace worn at the hip can fall within that wording, since the hip is part of the lower extremity. Who uses it: orthopedic and pediatric clinicians prescribe and fit these devices, and clinic and supply staff stock them. For related background see what is orthopedics and what is physical therapy.
Hip abduction braces and harnesses
Abduction means moving the legs away from the midline of the body. According to the International Hip Dysplasia Institute (IHDI), when dislocated or unstable hips in newborn infants can easily be realigned, a brace or harness is usually used that holds the legs in a better position for the hip while the socket and ligaments become more stable, which encourages normal development of the hip joint. IHDI also notes that hip abduction braces are commonly used immediately after treatment with a spica cast, where time in a brace helps reintroduce more range of motion to the hips while the hip is growing and becoming more stable.
Types and variants
| Type | Typical use | Key difference |
|---|---|---|
| Pavlik harness | Positioning the legs of infants with dislocated or unstable hips | IHDI calls it the most common type of positioning device |
| Fixed abduction brace | Positioning the legs after treatment, including after a spica cast | IHDI describes these as other braces that are commonly used alongside the Pavlik harness |
| Limb orthosis (regulatory category) | Supporting, correcting or preventing deformities, or aligning body structures | The FDA device category under 21 CFR 890.3475 that hip braces belong to |
The terms “hip abduction brace” and “abduction brace” refer to this kind of leg-positioning device. IHDI states that the choice of device depends on the needs of the family and the treatment experience of the doctor, so selection is a clinical decision.
How hip braces are regulated in the US
Under 21 CFR 890.3475(b), limb orthoses are Class I (general controls). They are exempt from the premarket notification (510(k)) procedures of subpart E of part 807, subject to the limitations in 21 CFR 890.9. They are also exempt from the quality management system regulation in part 820, except for requirements concerning records and complaint files under 21 CFR 820.35. For another orthopedic support product, see cervical collar types and sizing.
Safe use and handling basics
- Use is directed by the treating clinician. IHDI describes full-time wear that is later followed by part-time wear; the length and timing of each stage come from the child’s clinician.
- Whether the brace may ever be taken off, for example for bathing, is the clinician’s decision, not a general rule.
- Follow the manufacturer’s instructions for use for fitting, cleaning and adjustment of the specific product.
Common mistakes
- Treating “hip brace” as one product. The name covers different devices for different purposes, and infant abduction braces are a different category from the supports an adult might wear.
- Removing the brace without clinician guidance. Removal is a decision for the treating doctor.
- Assuming Class I means no oversight. Class I devices remain subject to general controls, and the exemptions above are limited by 21 CFR 890.9 and, for quality records, by 21 CFR 820.35.
Frequently asked questions
What is a hip abduction brace?
It is a brace or harness that holds an infant’s legs apart in a position that supports the hip joint while the socket and ligaments become more stable (International Hip Dysplasia Institute).
Are hip braces regulated by the FDA?
Yes. They are limb orthoses under 21 CFR 890.3475, Class I with general controls, and exempt from 510(k) premarket notification subject to the limits in 21 CFR 890.9.
What is a hip abduction pillow?
“Hip abduction pillow” is an informal search term. The positioning devices the International Hip Dysplasia Institute describes are the Pavlik harness and the abduction brace; see the abduction brace section above. For clinic supply context see the sports medicine clinic supply checklist; for another mobility device, see what is a walker.
Sources
- U.S. Code of Federal Regulations, 21 CFR 890.3475 Limb orthosis, https://www.ecfr.gov/current/title-21/chapter-I/subchapter-H/part-890/subpart-D/section-890.3475 (checked 2026-10-30).
- International Hip Dysplasia Institute, “Hip Abduction Brace”, https://hipdysplasia.org/?p=2093 (checked 2026-10-30).
