Vertebra cervicalis III (C3)
The third cervical vertebra is a typical mid-cervical vertebra with a relatively large body, prominent ventral crest, and bifid transverse processes characteristic of equine cervical vertebrae. The articular processes (facets) are large and oriented to allow flexion, extension, and lateral bending. C3 is a common site for articular process joint (facet) arthritis in sport horses. The cervical vertebrae support the head and neck and allow flexion, extension, lateral bending, and rotation. The neck acts as a balancing rod during locomotion.
Origin: N/A (bone)
Insertion: N/A (bone)
Action: Support the head and neck; allow flexion, extension, lateral bending, and rotation; the neck acts as a balancing rod during locomotion
Articular process joint arthritis at C3 is a recognized cause of neck pain and reduced performance in sport horses. Diagnosis uses clinical examination and radiography or advanced imaging. Relevant in evaluations of neck mobility and after trauma.
## Overview Facet joint arthritis at the C3 level involves the articular process joints between the second/third or third/fourth cervical vertebrae. While caudal joints are more commonly clinically s
Wobbler syndrome, also known as cervical vertebral stenotic myelopathy, is a neurologic condition caused by compression of the spinal cord in the neck. It leads to progressive incoordination (ataxia),
Persistent neck stiffness or reduced performance that does not respond to basic management should be evaluated. Correct saddle fit and balanced work help protect the region.
## Overview Facet joint arthritis at the C3 level involves the articular process joints between the second/third or third/fourth cervical vertebrae. While caudal joints are more commonly clinically significant, mid-cervical arthropathy can still produce neck stiffness, reduced lateral bending, and occasionally referred signs. Radiographic changes must be interpreted in light of clinical findings. ## Causes Repetitive motion, prior trauma, and conformational stress contribute to cartilage wear and osteophyte formation at this level. ## Diagnosis Clinical evaluation of neck mobility plus radiographs or ultrasound demonstrating osteophytes and joint remodeling. Intra-articular analgesia can confirm relevance. ## Treatment Ultrasound-guided corticosteroid injection, anti-inflammatory medication, and mobilization exercises are the primary treatments. ## Recovery and Prognosis Most horses improve with targeted therapy. The condition can progress or involve adjacent levels over time. ## Prevention No specific measures beyond general neck-health management. Signs include: reduced lateral bending of the mid-neck; stiffness; occasional forelimb gait change; radiographic osteophytes at C3 articulations
Wobbler syndrome, also known as cervical vertebral stenotic myelopathy, is a neurologic condition caused by compression of the spinal cord in the neck. It leads to progressive incoordination (ataxia), primarily in the hind limbs. There are two main forms: Type I (dynamic compression in young horses) and Type II (static compression in older horses due to osteoarthritis). ## What it is In Type I wobbler syndrome, developmental abnormalities of the cervical vertebrae cause narrowing of the vertebral canal and dynamic compression of the spinal cord during neck movement. It typically affects horses between 1 and 4 years of age, most commonly at C3 to C5. Type II wobbler involves static compression from osteoarthritic enlargement of the articular facets, usually affecting older horses at C5 to C7. Both forms result in damage to the spinal cord, leading to proprioceptive deficits and ataxia that is usually worse in the hind limbs. ## Signs and symptoms - Progressive hindlimb incoordination and ataxia - Wide-based stance and stumbling, especially when turning or going downhill - Toe dragging and difficulty backing - Neck stiffness or pain in some cases - In severe cases, weakness or falling - Symmetric or slightly asymmetric ataxia that is worse in the hind limbs than forelimbs - Positive cervical flexion test in many cases ## Causes and risk factors Type I wobbler is developmental and linked to rapid growth, genetic factors, and nutritional imbalances (especially copper deficiency or excess protein/calcium in young horses). Type II is associated with chronic wear and osteoarthritis of the cervical facet joints. Risk factors include large body size, rapid growth rates in young horses, and conformational issues that place abnormal stress on the neck. ## How it is diagnosed Diagnosis is based on clinical neurologic examination and confirmed with radiographs and myelography or MRI. Standing or recumbent radiographs can show vertebral canal narrowing or facet joint changes. Myelography or MRI provides the most accurate assessment of spinal cord compression. A neurologic grading system helps quantify the severity of ataxia. ## Treatment and management Treatment depends on the type, severity, and age of the horse. Conservative management includes stall rest, anti-inflammatory medication, and controlled exercise. For young horses with Type I, dietary management and restricted growth may help. Surgical options (ventral interbody fusion or dorsal laminectomy) are available for selected cases and can improve neurologic function in many horses. Prognosis varies widely depending on the severity and duration of compression before treatment. ## When to call the vet Contact your veterinarian promptly if your horse shows incoordination, stumbling, or difficulty backing or turning. Early diagnosis improves the chance of successful management or surgical intervention. ## Prevention For Type I wobbler in young horses, prevention focuses on balanced nutrition (avoiding excessive protein and calcium while ensuring adequate copper and other minerals) and avoiding overly rapid growth rates. Regular monitoring of at-risk young horses can help with early detection. ## Frequently asked questions **Can a horse with wobbler syndrome be ridden?** Many horses with mild to moderate signs can be ridden carefully after treatment, but those with severe ataxia are usually retired for safety reasons. **Is surgery always successful for wobbler syndrome?** Surgical success rates are good in appropriately selected cases, but results vary depending on the severity and chronicity of spinal cord damage. **Is wobbler syndrome hereditary?** There is a genetic component, especially in Type I. Breeding horses with wobbler syndrome or from lines with high incidence is generally discouraged. This information is for educational purposes only. Always consult with a licensed veterinarian for diagnosis and treatment of your horse. Signs include: Progressive hindlimb incoordination and ataxia; wide-based stance and stumbling, especially when turning or going downhill; toe dragging and difficulty backing; neck stiffness or pain in some cases; in severe cases, weakness or falling; symmetric or slightly asymmetric ataxia worse in hind limbs; positive cervical flexion test in many cases
Articular process joint arthritis at C3 is a recognized cause of neck pain and reduced performance in sport horses. Diagnosis uses clinical examination and radiography or advanced imaging. Relevant in evaluations of neck mobility and after trauma.
Persistent neck stiffness or reduced performance that does not respond to basic management should be evaluated. Correct saddle fit and balanced work help protect the region.
See the Third Cervical Vertebra (C3) on our interactive 3D horse model. Open 3D Model