09/10/2026
Impinging DSPs (aka: “Kissing Spines”)
Citation: Clayton HM, Stubbs NC, Enthesophytosis and Impingement of the Dorsal Spinous Processes in the Equine Thoracolumbar Spine, Journal of Equine Veterinary Science (2016), doi: 10.1016/j.jevs.2016.07.015
Why posture and riding methods can make a difference
Many horse owners are concerned and ask me if I think their horse has “kissing spines” when their horses exhibit sensitivity to their spine (either on palpation or when placing tack).
This research tells us: 1)many “kissing spines” exist and may be asymptomatic (can show up on xrays although the horse doesn’t exhibit and may never exhibit a problem), and 2)many times xray images are inconclusive (where the horse DOES have “kissing spines” and it is missed on imaging).
Key points of this research article (aka “readers digest” version):
Impinging DSPs (dorsal spinous process) is the most common osseous spinal pathology of horses. It occurs when the interspinous space is too narrow or the horse’s posture is excessively lordotic (“sway back”). If the horse is worked in a more rounded posture, it may help to avoid clinical progression in horses with asymptomatic impingement. A radiographic study showed greater separation of the DSPs with the lowered head and neck and closer approximation with the head and neck raised.
Horses with clinically significant impinging DSPs usually exhibit non-specific signs, such as altered hindlimb gait, resistance to work, toe dragging, poor jumping performance, and rigid posture of the thoracolumbar spine. Although they do not usually have an adverse reaction to palpation of the DSP affected horses may be painful when ridden and may show persistent bucking, rearing, refusing to jump and other forms of resistance which may be sufficiently serious to result in their loss of use as riding horses.
In conclusion, the results of this study confirm that osseous lesions of the DSPs occur frequently in horses with more severe lesions being found in the cranial thoracic, mid to caudal thoracic and mid-lumbar regions. The presence of severe osseous DSP lesions in the cranial thoracic and lumbar regions presents a challenge for diagnostic imaging, so lesions in these areas may be under-diagnosed. Anatomy and mechanics suggest that the signs are likely to be exacerbated by ridden exercise.
How can bodywork help?
Clearly, current conformation and age of the horse, proper riding and tack are important considerations. Reducing posture lordosis is key to relieving the touching of the DSPs but with an older horse where osseous changes likely have already occurred, doing belly lifts and pelvic rounding during a monthly session isn’t enough and only presents a temporary relief. Improving your horse’s core strength and stability is key and takes repetition over time. Conscious riding style, tack and consistent postural fitness are musts!
Look for me issuing homework for my clients to improve their horses’ core and spinal strength and stability!