07/01/2026
The sacroiliac joint (SIJ) is one of the most important- and most misunderstood- areas of the equine body.
The SIJ sits deep within the pelvis, where the sacrum (the base of the spine) meets the ilium (part of the pelvis). Each horse has two SI joints, one on each side.
Because it’s surrounded by large muscles and strong ligaments, the SIJ isn’t something we can easily see or palpate — but its function is crucial.
The SIJ transfers power from the hind limbs to the spine, stabilises the pelvis during movement, allows efficient propulsion in walk, trot, canter, and jump, and supports collection, engagement, and straightness.
Put simply... if the SIJ isn’t functioning well, power can’t move forward properly.
Why is the SIJ so important for performance?
A healthy SIJ allows symmetrical hindlimb movement, engagement through the core stabilisers and top line, comfortable transitions, and willingness to sit, collect, and push off. When the SIJ is compromised, horses often compensate elsewhere- leading to secondary back pain, muscle tightness, or limb issues.
Common signs of SIJ dysfunction include but aren't limited to:
- Loss of impulsion or reluctance to go forward
- Difficulty with canter leads or transitions
- Resistance to collection
- Hind-end stiffness
- Poor performance without obvious lameness
- Behavioural changes under saddle
Physiotherapy focuses on improving pelvic stability, reducing compensatory muscle tension, restoring normal movement patterns, and supporting vet-led diagnosis and rehab plans.
At Equi-Formance, SIJ cases often benefit from a combination of:
- Targeted manual therapy
- Winback TECAR therapy to support deep tissue healing and pain modulation
- Progressive exercise guidance
📩 Concerned about your horse’s hind-end movement or performance?
Get in touch to discuss an assessment or vet-supported rehab plan.
Equi-Formance – Advanced equine physiotherapy & TECAR therapy across Northern Ireland.
