Hemilaminectomy (Spinal Decompression Surgery)
A neurosurgical spinal decompression procedure that removes one side of a vertebral lamina to access and extract herniated intervertebral disc material crushing the spinal cord.
💬 In Plain English
A hemilaminectomy is the premier emergency neurosurgical procedure performed on dogs suffering from severe "slipped disc" disease (Intervertebral Disc Disease, or IVDD), most famously in Dachshunds, Corgis, and French Bulldogs. When an intervertebral disc ruptures, it blasts hard, calcified disc material upward into the spinal canal, severely pinching the delicate spinal cord and paralyzing the rear legs. In a hemilaminectomy, a veterinary neurosurgeon removes the muscle along the spine and uses a high-speed surgical burr to drill away a small "window" in the side of the vertebrae (the lamina and pedicle). This opens immediate space around the spinal cord and allows the surgeon to gently tease out all the crushing disc fragments.
🔬 Clinical & Technical Depth
For Vets & TechniciansFormal Clinical Definition
Surgical excision of the lateral vertebral lamina, pedicle, and articular facets over the spinal cord to decompress the spinal cord parenchyma and evacuate extruded Hansen Type I intervertebral disc herniations.
Why Veterinarians Use It
Veterinary neurosurgeons perform emergency hemilaminectomies on paralyzed dogs with loss of voluntary motor function or deep pain sensation.
Clinical Context Encountered
Discussed when a dog suddenly drags their rear legs, knuckles on rear paws, or cries out with arched back pain.
Clinical Reference Guide (Surgical Procedure)
Aftercare & Recovery
Strict crate confinement for 6 to 8 weeks; manual bladder expression 3–4 times daily if incontinent; padded bedding; physical rehabilitation (range-of-motion exercises, underwater treadmill once incisions heal).
- •Loss of "deep pain perception" (no behavioral response when a veterinary doctor pinches the rear toe bones with forceps) is a surgical emergency: decompressive surgery within 24 hours offers the only hope of walking again.
❓ Questions to Ask Your Veterinarian
Take these actionable questions with you to your next clinic visit or appointment:
- 1Does my dog still have deep pain perception (intact nociception) in their rear toes?
- 2Did the preoperative MRI or CT scan confirm the exact spinal disc space (e.g. T12-T13 or L1-L2)?
- 3How do I express my dog’s bladder manually at home until voluntary bladder control returns?
Academic & Clinical References
- ACVIM Consensus Statement on the Diagnosis and Management of Canine Thoracolumbar Intervertebral Disc HerniationOrganization: American College of Veterinary Internal Medicine (ACVIM) • Accessed: 2026-01-10https://www.acvim.org