Kissing Spines in Horses: Back Pain, Performance Problems, and Treatment
- Kissing spines means the dorsal spinous processes in the back are too close together or overlapping, which can cause pain and poor performance.
- Some horses have radiographic changes without pain, so diagnosis should combine exam findings, ridden history, and imaging.
- Common signs include sensitivity over the back, bucking, resistance under saddle, hollowing, cross-cantering, and declining performance.
- Treatment often combines pain control, saddle and tack review, core-strengthening rehab, and a gradual return-to-work plan. Surgery is an option for selected horses.
- See your vet promptly if your horse develops sudden severe back pain, dangerous behavior under saddle, marked performance decline, or weight loss.
What Is Kissing Spines in Horses?
Kissing spines is a painful back condition in which the bony projections on top of the vertebrae, called the dorsal spinous processes, sit too close together, touch, or overlap. Your vet may also call it impinging or overriding dorsal spinous processes. It is most often found in the thoracic back, especially around T10-T18, though similar changes can also be seen farther back in the lumbar region.
This condition matters because the rubbing and pressure between these bones can inflame nearby tissues and make normal back movement uncomfortable. Horses may show back pain, resistance to work, or vague performance problems. Others may have clear changes on X-rays but show little or no discomfort. That is why imaging alone does not tell the whole story.
Kissing spines is considered one of the more common causes of equine back pain. It is seen often in ridden and performance horses, including Thoroughbreds and dressage horses. The practical question is not only whether the changes are present, but whether they match your horse's pain pattern, exam findings, and work-related issues.
Symptoms of Kissing Spines in Horses
- Pain or flinching when the back is palpated
- Resistance under saddle, including hollowing the back or refusing to move forward
- Bucking, kicking out, tail swishing, or pinning ears during tacking up or riding
- Girthiness or sensitivity during grooming and saddling
- Poor performance, shortened stride, stiffness, or trouble with collection and transitions
- Cross-cantering, swapping leads, refusing fences, or approaching jumps awkwardly
- Generalized lameness or hind-end soreness without an obvious limb cause
- Weight loss, muscle loss over the topline, or worsening attitude with work
Kissing spines often causes vague, frustrating signs rather than one dramatic symptom. Many horses look fine at rest but become reactive during grooming, saddling, lunging, or ridden work. Others show a slow decline in performance, especially with collection, jumping, or canter work.
See your vet sooner rather than later if your horse becomes unsafe to ride, suddenly refuses work, develops marked back pain, or loses condition. Also ask for an exam if the behavior seems new or out of character. Back pain can overlap with lameness, saddle-fit problems, sacroiliac pain, ulcers, or dental and training issues, so a full workup matters.
What Causes Kissing Spines in Horses?
Kissing spines develops when the spaces between the dorsal spinous processes narrow enough that the bones touch or overlap. Over time, that contact can lead to inflammation, pain, and bony remodeling. The exact reason one horse becomes painful and another does not is not always clear.
Several factors may contribute. These include back conformation, poor topline and core engagement, repeated strain during work, and poor saddle fit that increases pressure over an already sensitive area. Horses that travel hollow-backed for long periods may place more stress on the thoracic spine. Repetitive trauma and chronic inflammation may also worsen bony change.
It is important to know that kissing spines is often multifactorial. A horse may have radiographic narrowing plus a weak topline, hind-limb lameness, or tack-related pain. That is why treatment usually works best when your vet looks at the whole horse rather than the spine alone.
How Is Kissing Spines in Horses Diagnosed?
Diagnosis starts with a careful history and physical exam. Your vet will ask when the signs happen, whether they are worse under saddle, and how your horse behaves during grooming, tacking up, lunging, and ridden work. A lameness exam is often part of the process because limb pain, sacroiliac disease, and back pain can overlap.
Your vet will usually palpate the back, assess spinal flexibility, and look for muscle soreness or topline loss. Radiographs (X-rays) are the main imaging test used to identify narrowed or overlapping dorsal spinous processes. In some horses, your vet may also recommend ultrasound, scintigraphy (bone scan), or diagnostic local anesthetic injections to help confirm whether the radiographic changes are actually the source of pain.
This distinction matters. Some horses have obvious X-ray changes and no clinical signs, while others are clearly painful. A diagnosis of clinically important kissing spines is strongest when the imaging findings match the exam, the horse's work history, and the response to targeted pain relief or rehabilitation.
Treatment Options for Kissing Spines in Horses
Spectrum of Care means you have options. Here are treatment tiers at different price points.
Budget-Conscious Care
- Exam and baseline radiographs if not already done
- Short-term pain and inflammation control as directed by your vet
- Saddle-fit and tack review
- Structured rehab focused on core engagement, topline strengthening, and gradual return to work
- Groundwork, lunging systems when appropriate, and stretching exercises such as baited carrot stretches
Recommended Standard Treatment
- Complete lameness and back-pain workup with radiographs and targeted diagnostics
- Medical management such as corticosteroid injection of affected interspinous spaces when your vet feels it is appropriate
- Shockwave therapy or mesotherapy in selected cases
- Formal rehabilitation plan with ridden and in-hand exercises to improve spinal motion and abdominal engagement
- Recheck exams to adjust the plan based on comfort and performance
Advanced / Critical Care
- Referral-hospital evaluation with advanced imaging or scintigraphy when needed
- Surgical treatment such as interspinous ligament desmotomy or partial ostectomy in selected horses
- Hospitalization, anesthesia or standing surgical protocols depending on procedure
- Postoperative pain control and a structured multi-month rehabilitation program
- Follow-up imaging or specialty rechecks for return-to-performance planning
Cost estimates as of 2026-03. Actual costs vary by location, clinic, and individual case.
Questions to Ask Your Vet About Kissing Spines in Horses
Bring these questions to your vet appointment to get the most out of your visit.
- Do my horse's X-rays match the pain and performance signs we are seeing, or could something else also be contributing?
- Which vertebrae are affected, and how severe do the changes look on imaging?
- Should we also evaluate for hind-limb lameness, sacroiliac pain, saddle-fit problems, or ulcers?
- What conservative care plan do you recommend first, and how long should we try it before reassessing?
- Would injections, shockwave, or mesotherapy be reasonable for my horse's case?
- What exercises are safest during rehab, and which activities should we avoid right now?
- What signs would tell us that surgery should be considered?
- What is the expected cost range for diagnosis, treatment, and follow-up in my area?
How to Prevent Kissing Spines in Horses
Not every case can be prevented, especially when conformation plays a role, but good management can lower strain on the back and may reduce the chance that mild changes become painful. The biggest practical steps are maintaining topline and core strength, avoiding long periods of hollow-backed work, and making sure tack fits correctly.
Regular conditioning matters. Horses benefit from progressive fitness, correct flatwork, and exercises that encourage abdominal engagement and better spinal use. Sudden increases in workload, poorly fitting saddles, and inconsistent training can all make back discomfort more likely. If your horse has already had kissing spines, a long-term rehab and conditioning plan is often part of prevention.
Early attention helps too. If your horse becomes girthy, reactive during grooming, resistant under saddle, or starts losing performance, ask your vet to evaluate the problem before it becomes more entrenched. Catching pain early may allow more treatment options and a smoother return to work.