08/09/2026
I have to explain this at 99% of saddle fittings!
It’s an issue I’m faced with daily and a particular bugbear of mine.
There are lots of compact TBs out there for who this is a very real problem.
The stated saddle size, such as 17”, refers to the seat size. It does not dictate the panel length. Several saddles can have exactly the same seat measurement, while the panels underneath vary considerably in length.
This is another reason why you can’t simply buy a particular size of saddle and assume it will fit your horse.
That’s where a qualified Saddle Fitter comes in!
✉️ [email protected]
📞 07736 855366
Saddle length is still among the most common saddle fit issues seen today.
Historically, saddles were designed with long panels under the assumption that a greater weight-bearing surface would better distribute pressure. This worked reasonably well for horses with long, broad backs at the time.
However, modern sport horses have been selectively bred to be shorter coupled to enhance collection, agility, and power. Unfortunately this also means that the real-restate for saddle fit has significantly reduced over the years.
Despite this, many saddles have retained the same panel lengths as their historical predecessors. The result is an increasing mismatch between saddle length and the horse’s safe weight-bearing zone, with many saddles extending beyond the last thoracic rib.
The equine lumbar spine represents a region of mobility, not load-bearing.
Anatomically, it bridges the powerful propulsive forces of the hindquarters with the more rigid thoracic region, facilitating transmission of motion and stabilization through dynamic muscular control. Unlike the thoracic vertebrae, the lumbar vertebrae do not articulate with ribs and therefore lack the structural scaffolding required for weight support.
Each lumbar vertebra features prominent transverse processes, which extend laterally to provide broad attachment surfaces for key epaxial musculature, including the longissimus dorsi, iliocostalis lumborum, and multifidus.
These muscles act collectively to stabilize the spine, modulate dorsoventral flexion and extension, and maintain postural integrity during locomotion.
When a saddle extends caudally beyond the thoracic region or applies direct pressure over the lumbar transverse processes, this compromises the intended biomechanical function of the area, leading to hypertonicity across the thoracolumbar region.
This often manifests as ventral flexion of the thoracolumbar region (“dropping the back”), a protective postural response to avoid further compression of sensitive structures.
This compensatory response alters thoracolumbar mechanics, restricts energy transfer through the back, and diminishes engagement of the hindquarters.
Over time, sustained mechanical loading in this region can lead to muscular atrophy, altered coordination of the thoracolumbar fascia, and reduced lumbosacral mobility, each of which negatively influences performance and comfort.
From a saddle-fitting perspective, it is essential to respect the functional boundary between the weight-bearing thoracic region and the non-weight-bearing lumbar region.
The lumbar spine is designed to move and transmit, not to support external load.
Ensuring the saddle does not infringe on this zone preserves spinal mobility, prevents compensatory tension, and maintains biomechanical efficiency through the horse’s back.
