Hemilaminectomy

Medical management — strict rest, pain medication, anti-inflammatories — may be appropriate for mild disc disease with preserved ability to walk. Hemilaminectomy is recommended when:

• The dog has lost the ability to walk (paresis or paralysis) — especially urgently if deep pain sensation is still present
• Neurological signs are rapidly worsening despite medical therapy
• Pain is severe and unresponsive to conservative treatment
• A second or third episode of disc herniation occurs

The single most important factor in outcome is time: dogs that undergo surgery within 24–48 hours of losing the ability to walk have significantly better odds of recovery than those treated days later. If your dog cannot use its back legs, this is an emergency.

Hemilaminectomy is performed under general anesthesia with the dog positioned in sternal recumbency (belly down). The steps:

• Imaging — myelogram, CT, or MRI — is used to precisely identify the affected disc level before the first incision
• A skin incision is made over the spine, and the paraspinal muscles are retracted to expose the vertebrae
• A small window (laminectomy defect) is created in the vertebral bone on the side from which the disc herniated, using a high-speed drill and rongeurs
• The extruded disc material is carefully removed from the spinal canal using microsurgical instruments under magnification
• The spinal cord is inspected and any remaining disc fragments are evacuated
• Muscles and skin are closed in layers

Before surgery, a thorough neurological examination is performed and scored — this baseline is essential for assessing recovery. Imaging (myelogram or CT/MRI) confirms the location and extent of disc herniation. Pre-anesthetic bloodwork is run. For dogs with loss of walking ability, the team moves quickly to minimize the time the spinal cord spends under compression. IV fluids, anti-inflammatories, and pain medications begin immediately on admission while imaging is arranged.

Recovery after hemilaminectomy is a gradual process over weeks to months, depending on how severe the neurological deficit was before surgery:

• Days 1–5 (hospital): bladder management, nursing care, passive limb exercises, IV pain control; most dogs show improvement in pain within 24 hours
• Weeks 1–4 (home): strict rest with controlled bathroom trips on a sling or harness; continue pain medications; bladder expression if needed
• Weeks 4–8: structured physiotherapy exercises increase as function returns — standing, supported walking, aquatic therapy in some cases
• Weeks 8–16: most dogs with intact deep pain sensation recover walking ability, though timelines vary considerably

Physiotherapy — both professional sessions and owner-performed home exercises — dramatically accelerates recovery and is strongly encouraged.

Hemilaminectomy has a high success rate when performed in dogs with preserved deep pain sensation. The main prognostic factor is whether deep pain — the ability to feel a strong stimulus in the toes — is present at the time of surgery. Dogs with intact deep pain: recovery rates above 90%. Dogs without deep pain (complete myelomalacia risk): recovery is still possible but less predictable, and the team will discuss realistic expectations honestly. Other surgical risks include wound infection, implant complications (rare, as no implants are routinely used), and spinal cord swelling in the immediate post-operative period. Our team monitors for progressive myelomalacia — an ascending cord deterioration — which, if it occurs, has a grave prognosis and is discussed with owners early.