What is Sciatic Nerve Injury?
Due to the nerve running over the greater sciatic notch, injuries may be common as a result of poor injecting of intramuscular injections (these are injections that are inserted into the muscle) or pelvic fractures. Tumor growth may also have an impact on the nerve.
The sciatic nerve is a sensory motor nerve with two divisions that innervate the muscles behind and below the knee. These divisions are the tibial and peroneal nerves.
The sciatic nerve is a sensory nerve that originates from the 7th lumbar vertebrae and sacrum of a dog’s spinal cord.
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Symptoms of Sciatic Nerve Injury in Dogs
- The dog will not be able to flex their hock and knee
- Flexion and extension of the paw will not occur
- Back pain in the lumbosacral region
- Inability to urinate or defecate properly
- Change in posture
- Muscle wastage due to lack of blood flow
- Abnormal gait movement; the dog will not put much pressure on the affected side
- Pain on affected side, however should a deep lesion on the sciatic nerve occur then pain may not be observable
Sciatic neuropathies may be associated with compression of the sciatic nerve, this may be caused by lymphomas, which are benign tumors. Iatrogenic trauma occurs as a result of fracturing in the pelvic region. Lumbosacral disease associated with the compression of the sciatic nerves, like humans, would be associated with sciatica.
Sciatic nerve injury may further be classed into 3 levels of severity:
Neurapraxia refers to the least severe case of sciatic injury, where by the dog’s nerve may have mild damage and with appropriate treatment this damage is reversible.
Axonotmesis refers to the second class of damage of the sciatic nerve. Animals with Class 2 may have their axons partially destroyed while surrounding connective tissue may still be intact. As such, canines classed with axonotmesis may often experience lack of motor function by the nerve, pain, and an inability to stretch their hind limbs. Muscle waste (atrophy) may be a common clinical sign.
Neurotmesis refers to the most severe and often irreversible injury of the sciatic nerve. This occurs as a result of complete destruction of the axons and connective tissue of the sciatic nerve.
Causes of Sciatic Nerve Injury in Dogs
Injuries to the sciatic nerve are often quite common in dogs as they may have a range of causes. These include:
- Hip fractures
- Displacement of the lumbosacral joint
- Iatrogenic trauma - these may be seen as femoral fractures, diaphyseal fracture repair, triple stabilization of hip luxations, repairing any hernia in the perineal region and intramuscular injections directed to the hamstrings
Diagnosis of Sciatic Nerve Injury in Dogs
Diagnosis is based on clinical signs, history of any traumatic injury, electrophysiology, spinal reflex testing and/or X-rays, should your dog have experienced a trauma (for example, a car accident).
In regards to spinal reflex testing, a withdrawal reflex may be done in order to determine the flexing of the hock.
If the cause of sciatic nerve damage was a result of neoplasm (such as a tumor growth) then a CT, MRI or ultrasound may be done in order to verify the presence of cancerous growths such as lymphosarcoma.
Treatment of Sciatic Nerve Injury in Dogs
Treatment of sciatic injuries may vary depending on a multitude of factors such as severity and cause. Should the sciatic nerve be completely paralyzed then your vet may surgically reroute the digital extensor tendon to an area on the femur. This is referred to as muscle relocation which is a procedure that allows the knee joint to be supported by the quadriceps.
Should the sciatic nerve be damaged as a result of injury towards the lumbosacral plexus, then veterinarians may consider amputation of the affected hindlimb. Sciatic nerve injury as a result of neoplasia may be treated with either chemotherapy and/or through surgical removal of the growth.
Recovery of Sciatic Nerve Injury in Dogs
Postoperative recovery and management may take anywhere from 2 to 6 months of recovery depending on the severity of the operation. Management often involves:
- Avoiding the recovering limb from sustaining any more secondary problems such as pressure exertion and lack of blood circulation
- Hydrotherapy and/or shockwave therapy
If amputation was not the method of treatment, then postoperative care may involve reducing inflammation that may have occurred as a result of traumatic injury. Your veterinarian may administer NSAIDs (non-steroidal anti-inflammatory drugs) for approximately 5 to 7 days post op. The purpose of this is to promote blood circulation and regeneration of nerves by decreasing the risks of edemas.
Your veterinarian may suggest physiotherapy in order to prevent muscle wastage. Additionally, owners are encouraged to massage their dogs’ affected leg in order to stimulate recovery time.
Sciatic Nerve Injury Questions and Advice from Veterinary Professionals
My chiwuaha got ran over crushing his pelvis and severing his ciatic nerve .The vet told us he cld possibly get better or he cld be miserable his whole life and suggested putting him down,but we are having a hard time w that ,if there is a chance he can get better and have a good life how that's a chance we are willing to take. But are we being selfish ,uhe be put down ? We are taking good care of him and keeping him confined. When he does walk he walks on his front feet. He yelps alot when moving but not all the time . Will he ever be able to use his back legs w his nevre being sevard ,will the pain go away ,please give us your honest opinion as to wt we could do ,thanks Brad should he be put down
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My dog had an indent in his gum in his mouth. I took him for a second opinion and the vet gave him a shot in his muscle in his thigh saying it was glucosamin two days later my dog was paralyzed. That particular leg is now bent funny and painful to him
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Hi my chocolate Labrador became lame after chasing ball and has a suspected cruciate ligament tear.We were away in Aistria at the time so she was on Metacam and lead walking (plenty of swimming) till 3 weeks later. At home she had X-rays as still not fully bearing weight on her hind right leg. They discounted the cruciate ligament as being the cause as both knees and hips were perfect but a spinal x-ray revealed a small lump bridging 2 vertebrae in her lower back. She now has suspected sciatica and is waiting referral to a specialist to have an MRI scan and potentially surgery to remove said lump (which may be pressing on her spinal cord, I suspect it may be the disc).It's now 5 weeks since she became lame and is increasingly getting restless and wants to run but she is restricted to lead walks. She still has her Metacam everyday. If it is sciatica, what exercise can she do?
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