Medication of the cervical spinal nerves for the treatment of equine cervical radiculopathy

Summary Background Several perineural injection techniques have been described to medicate the cervical spinal nerves of horses with suspected radiculopathy due to lesions at the intervertebral foramen (IVF). The technique and outcome have never been described in live, standing horses with suspected clinical disease. Objective s To assess the safety and efficacy of medication of the ventral rami of the cervical spinal nerves (VRCSNs) for the treatment of cervical radiculopathy in horses. Study design Case series. Methods Horses that underwent ultrasound‐guided perineural injection of the VRCSNs following radiographic and/or computed tomography (CT) evaluation of the cervical spine were included. Perineural injection with corticosteroids was performed using a standardised technique under ultrasound guidance as previously described. Outcome data were collected by clinical record review and unstructured follow‐up telephone conversations. Results Forty‐seven injections of the VRCSNs were performed in 12 horses with only two self‐limiting adverse reactions noted. All horses that underwent CT examination had at least one site of IVF narrowing with the foramina at the C6/C7 articulation most frequently affected. Nine horses improved following medication of the VRCSNs with eight returning to their previous levels of exercise. All seven horses that underwent CT of the cervical spine had an initial improvement in clinical signs. Six horses were in full work and still performing at their intended level of exercise at a median of 21.5 months post injection. Main limitations Lack of definitive diagnosis of spinal nerve compression without histopathology of the spinal nerves which is not possible in the live horse. Conclusions Medication of the VRCSNs is a safe treatment option which may provide benefit to horses with suspected spinal nerve compression but should be reserved for horses that have undergone a detailed clinical examination and CT evaluation of the cervical spine.