Procedures · Peripheral Nerve & Brachial Plexus Surgery

Sciatic Nerve Injury

Medically reviewed by Dr. Khalid Almutairi, Consultant Plastic Surgeon — updated 2026-08-13

The sciatic nerve is the largest nerve in the body: it descends from the pelvis behind the thigh carrying most of the movement and sensation of the leg and foot, then divides near the knee into its two components — the tibial, which pushes the foot down, and the peroneal, which lifts it. Its injury is among the most substantial of peripheral nerve injuries and among the most consequential for walking and daily life — and its treatment is a multi-tool project, not a single decision.

Care is led by Dr. Khalid Almutairi, a consultant plastic and reconstructive surgeon, fellowship trained in hand surgery and microsurgery in Canada and the USA.

How is it injured, and what follows?

The commonest causes: hip dislocations, fractures and hip surgery; penetrating wounds; an intramuscular injection misplaced in the buttock; and stretch in road accidents. The effect depends on level and pattern:

• Weakness or paralysis of lifting the foot and toes (foot drop) — the peroneal component is often the worse affected, even in high injuries.
• Weak push-off when the tibial component is involved — directly affecting the power of walking.
• Weak knee bending in high injuries reaching the hamstring branches.
• Sensory loss that may include the sole of the foot — a critical point with its own section below.
• Nerve pain that can be severe and persistent, needing its own treatment plan.

Why does the peroneal component tend to suffer more?

Within the single trunk, the two components travel in different conditions: the peroneal is more tethered along its course and less cushioned, so it tolerates stretch and blunt injury less well. That is why a high sciatic injury often presents, in practice, as a foot drop with relatively preserved push-off — details that are read in the examination and steer the plan.

Assessment

Examination draws a precise map: which muscles are weak and to what degree, where the numbness ends, whether the injury is complete or partial, and whether signs of recovery are advancing or static. Electrodiagnostic studies (NCS/EMG) localise and grade the injury and detect reinnervation, with imaging where needed. The injury's story is reviewed carefully — an injury after hip dislocation is planned differently from a penetrating wound or a misplaced injection.

Protecting the insensate foot: a step that cannot wait

When the sole loses its protective sensation, the foot becomes vulnerable to wounds and ulcers its owner cannot feel — and they can worsen silently. A protection programme therefore starts from day one: daily inspection of the foot, appropriate footwear, skin care, and an ankle brace where there is foot drop. This is treatment in its own right, preventing complications that can outweigh the original injury.

Treatment options

The plan is assembled from graded tools according to pattern and time:

• Structured observation: for partial injuries and recoverable stretch, with serial examination and studies.
• Exploration and neurolysis: when the course suggests a nerve trapped in scar, or tethered by a fragment or suture.
• Direct repair or grafting: for sharp divisions — with complete candour: the distances to the leg and foot muscles are long, and recovery after high grafting is often partial and varies considerably between cases.
• Nerve transfer: in selected cases, for specific nearby targets, to shorten the regeneration distance.
• Tendon transfer: the established functional solution for stable foot drop — it has its own page — with analogous transfers considered for other targets according to the muscles available.
• A nerve-pain plan: medical, and interventional where needed, run in parallel with all of the above.

Realistic expectations

Outcomes in sciatic injury vary widely with level, pattern, timing, and age. Partial and low injuries fare clearly better; in high complete injuries the prospects of distant recovery are modest — and there, functional reconstruction and foot protection step forward to make the practical difference in walking and independence. Goals are built with the patient on this frank foundation from the start.

Limitations and risks

Risks include incomplete recovery — the foremost consideration in high injuries — persistent numbness or nerve pain, general surgical risks, and the known risks of tendon transfer where that path is taken. The risks relevant to your plan are discussed before every decision.

I was injured by a misplaced injection — will the nerve recover?

Injection injuries range from transient irritation to substantial damage. Early assessment and electrodiagnostics define the pattern, and follow-up decides between waiting and intervening — what matters is that it is not left unassessed.

Will I walk normally?

Many patients regain good functional walking through the right combination of nerve recovery, bracing, tendon transfer, and rehabilitation. The final walking picture differs by pattern and is discussed realistically for your specific case.

Years have passed since my injury — what remains available?

Once the reinnervation window has passed, the functional tools — tendon transfers, bracing, and gait programmes — together with foot protection and pain treatment remain available and worthwhile, assessed case by case.

Medical-information notice

This is general information and does not replace consultation and examination. New weakness or numbness in the leg after an injury, operation, or injection needs assessment without delay — and some causes of leg symptoms lie in the spine and need a different diagnostic pathway.