27/07/2026
The Thoracic Trapezius Muscle:
How do you know if it is healthy or dysfunctional?
The Trapezius originates along the dorsal side of the neck near the poll, inserts on the spine of the scapula. Includes the trapezius cervicalis (originates along the cervical vertebrae) and trapezius thoracis (originates along the thoracic vertebrae).
It is a muscle that commonly falls prey to atrophy from compensatory movement or poor saddle fitting issues.
Spotting problems:
Tension, spasm, under development or tears within the trapezius muscle may cause a reduction in stride length, scapula control and forelimb asymmetry and perhaps even lameness.
Another sign of a horse with issues in the trapezius muscle would be a visible ‘dip’ just below the withers behind the shoulder. When palpating I would expect the area to feel fibrous, tight and dehydrated with a possible spasm over the area. The horse may also show some objections to the area being touched as it will be sore.
In areas of atrophy, fascial tension or hypertonicity, the muscle will be unable to ripple underneath the hand. The skin may feel “stuck” over the surface, or it may feel like there is too little muscle to achieve this feeling.
Raised pole work in both walk and trot is an effective way of increasing the strength of the trapezius, because greater scapula stability is required as the limbs are lifted higher over the poles. All lateral exercises are useful for engaging, strengthening and conditioning the trapezius muscle. Shoulder-in is particularly useful for a jumper as this will improve his ability to lift his scapula, thus enhancing forelimb technique.