Sciatic Nerve Injury

Description[edit | edit source]

Sciatic nerve.png

Sciatic nerve injury occurs due to trauma (pressure, stretching or cutting) to the nerve and can cause symptoms such as paresthesias, loss of muscle power and pain.[1] These symptoms are similar to those caused by sciatica, however, the term 'sciatica' is typically used to refer to conditions where the sciatic nerve is irritated or compressed, rather than being injured directly. Please read our Sciatica page for more information.

Aetiology[edit | edit source]

  • Trauma - hip dislocation, acetabular fracture
  • Iatrogenic causes -
    • Direct surgical trauma
    • Faulty positioning during anaesthesia
    • Injection of neurotoxic substances
    • Tourniquets
    • Dressings, casts or faulty fitting orthotics
    • Radiation

Iatrogenic causes of Sciatic Nerve Injury.[edit | edit source]

Trauma to the sciatic nerve through

  • Injection injuries - also referred to as injection palsy[2] via intramuscular injection at gluteal region (dorsogluteal site). It describes a situation where there is a loss of movement and or lack of sensation at the affected lower extremity with or without pain.

[3]

  • Total Hip Replacement - nerve compression and stretch during surgery[4][5][6] causing damage to the sciatic nerve that serves the majority of muscle groups in the lower limb, resulting in dysfunction. Reported at a level of 1%[5]

Clinically Relevant Anatomy[edit | edit source]

The sciatic nerve is the longest nerve in the human body (with nerve roots L4, L5, S1, S2, S3) and is the continuation of the sacral plexus. The sciatic nerve is the most lateral structure emerging through the greater sciatic foramen inferior to the piriformis. Medial to it are: inferior gluteal nerve and vessels; the internal pudendal vessels; the pudendal nerve. It crosses the posterior surface of the ischium then crosses: Obturator Internus,Gemelli, Quadratus Femoris and descends on Adductor Magnus. The sciatic nerve divides into its terminal branches, the tibial and common peroneal nerves, usually just below the mid-thigh, although a higher division is not uncommon.[6][7]

[8]Figure 1

Epidemiology/Aetiology[edit | edit source]

Injection palsy can begin suddenly or hours following damage to the Sciatic Nerve. A misplaced intramuscular injection at the gluteal region is the most common cause of injury and it is attributed to either frequent injections or poor techniques as a result of inadequately trained staff or unqualified staff. [4][9][2]
It affects more males than females with a ratio of 2.7:1.[10] Within a period of two years, Pakistan recorded an annual incidence of six (6) million children.[4] Visit our nerve injury page for an overview.

Clinical Presentation/Characteristics[edit | edit source]

The common symptoms are pain and abnormal gait pattern.[2] However, pain intensity is difficult to quantify or rate particularly in the paediatric population but facial expression is quite helpful. Other clinical signs include:

Diagnostic Procedures[edit | edit source]

Sciatic neuropathy is more of a clinical diagnosis. Well, a detailed subjective and objective examination is the golden rule. Electro-diagnostic studies include;

Medical Management[edit | edit source]

In most cases, symptoms of Sciatic Nerve injury does not respond to the use of non-steroidal anti-inflammatory drugs (NSAIDs), opioids and myorelaxants.[15] However, the use of methylprednisolone via transacral block was effective to manage the neuropathic pain, motor and sensory deficits.[15] In addition, a recent study showed beneficial use of methylprednisolone via both intravenous and oral routes.[13]

Surgery is opted for patients that did not improve beyond 3 months of sustaining injection palsy[16]. Common procedures include neurolysis[16][12] and grafting[14] with serial clinical and electrophysiological monitoring. Patients with foot deformity can opt for elongation of the tendon Achilles, osteotomy and capsulotomy[11]. Although, conflicting findings are comparing conservative and surgical interventions.

Physical Therapy Management[edit | edit source]

Rehab equipment.png

Conservative means is the first line approach for the management of patients with sciatic nerve injury.[16][12][14][11][10]

  • Pain Management. Use of TENS, massage, gentle stretching and desensitisation techniques could be employed.
  • Exercise Prescription: The effectiveness of physical therapy to improve nerve regeneration in humans after nerve damage remains uncertain because, in the case of extensive injuries, exercise may not be the first line of management. But, knowledge of the benefit of exercise in the management of peripheral nerve injury such as the increase of neurite outgrowth, local neurotrophic factor levels, as well as synaptic conduction velocity says otherwise.[17] Also, a study shows that exercise prescription should be based on quality and intensity of exercise instead of the exercise volume.[18]
  • Electrical Muscle Stimulation: TENS and Electroacupuncture have been shown to help enhance nerve regrowth.[19]
  • Bio-laser Stimulation. Can help with nerve nutrition and regeneration.[19]
  • Magnetotherapy Can assist in nerve regeneration and lessen muscle atrophy.[19]
  • Joint or Soft Tissue mobilisation. To retain flexibility of muscle, nerve and soft tissue and prevent deformity.
  • Balance Training. Co-ordination, strength and flexibility loss leads to reduced balance.
  • Splinting. In the early stages following injury, bracing may be needed to prevent deformity and associated risks, e.g. Ankle Foot Orthosis (AFO) to prevent foot drop, skin damage and falls risk. Depending on the final outcome some form of bracing may still be needed.

[20]

Physiotherapists should ensure thorough evaluation through out the course of the treatment. Good clinical judgement, decision making skills and experience are important for effective rehabilitation.

A 2015 paper reported that Physiotherapeutic techniques used in peripheral nerve injures lack good randomised data. It went on to outline that many physiotherapists, physicians and clinicians understand fully treatment and intervention therapy, often not comprehending the time that nerves need to regenerate.[19] Watch the youtube below to enhance your knowledge of nerve regeneration

[21]

References[edit | edit source]

  1. Orthoinfo. Nerve injuries. Available from: https://orthoinfo.aaos.org/en/diseases--conditions/nerve-injuries/ (last accessed 15.3.2019)
  2. 2.0 2.1 2.2 2.3 2.4 Toopchizadeh V, Barzegar M, Habibzadeh A. Sciatic Nerve Injection Palsy in Children, Electrophysiologic Pattern and Outcome: A Case Series Study. Iran J Child Neurol. Summer 2015;9(3):69-72.
  3. Nabil Ebraheim. Glut injections. Available from: https://www.youtube.com/watch?v=c68pLxbqs_M[1][2] (last accessed 15.3.2019)
  4. 4.0 4.1 4.2 Cornwall, J. Are nursing students safe when choosing gluteal intramuscular injection locations? AMJ 2011;4, 6, 315-­32.
  5. 5.0 5.1 Schmalzried TP, Noordin S, Amstutz HC. Update on nerve palsy associated with total hip replacement. Clinical orthopaedics and related research. 1997 Nov(344):188-206. (last accessed 15.3.2019).
  6. 6.0 6.1 Moore KL, Dalley AF. Clinically Oriented Anatomy, 5th Edition. 2006 Pg 621.
  7. Ellis H. Clinical Anatomy: A revision and applied anatomy for clinical students. 11th Edition. 2006 Pg 253-254.
  8. Dayananda L, Belaval V V, Raina A, Chandana R. Intended intramuscular gluteal injections: Are they truly intramuscular?. J Postgrad Med [serial online] 2014 [cited 2017 Aug 16];60:175-8. Available from: http://www.jpgmonline.com/text.asp?2014/60/2/175/132334
  9. 9.0 9.1 Mishra P, Stringer MD. Sciatic nerve injury from intramuscular injection: a persistent and global problem. Int J Clin Pract, October 2010, 64, 11, 1573–1579
  10. 10.0 10.1 Geyik S, Geyik M, Yigiter R, Kuzudisli S, Saglam S, Elci MA, Yilmaz M. Preventing Sciatic Nerve Injury due to Intramuscular Injection: Ten-Year Single-Center Experience and Literature Review. Turk Neurosurg 2017; 27(4):636-640.
  11. 11.0 11.1 11.2 11.3 11.4 Napiontek M, Ruszkowski K. Paralytic drop foot and Gluteal fibrosis after intramuscular injection. J Bone Joint Surg [Br] 1993; 75-B: 83-5.
  12. 12.0 12.1 12.2 12.3 Brown BA: Sciatic injection neuropathy. Calif Med1972; 116: 13-15.
  13. 13.0 13.1 13.2 Altıntaş A, Gündüz A, Kantarcı F,  Gözübatık Çelik G, Koçer N, Kızıltan ME. Sciatic neuropathy developed after injection during curettage. A Case Report. Agri 2016;28(1):46–48.
  14. 14.0 14.1 14.2 Ong MJF, Lim GHT, Kei PL. Clinics in diagnostic imaging (140). Singapore Med J 2012; 53(8): 551–555.
  15. 15.0 15.1 Evren Eker H, Yalcin Cok O,  Aribogan A. A Treatment Option for Post-Injection Sciatic Neuropathy: Transsacral Block with Methylprednisolone. A Case Report. Pain Physician 2010; 13:451-456.
  16. 16.0 16.1 16.2 Arindhom Kakati, Dhananjaya Bhat, Bhagavathula Indira Devi, Dhaval Shukla J Neurosci Rural Pract. 2013 Jan-Mar; 4(1): 13–18.
  17. Maugeri G, D'Agata V, Trovato B, Roggio F, Castorina A, Vecchio M, Di Rosa M, Musumeci G. The role of exercise on peripheral nerve regeneration: from animal model to clinical application. Heliyon. 2021:29;7(11).
  18. Cannoy J, Crowley S, Jarratt A, Werts KL, Osborne K, Park S, English AW. Upslope treadmill exercise enhances motor axon regeneration but not functional recovery following peripheral nerve injury. J Neurophysiol. 2016;116(3):1408-17.
  19. 19.0 19.1 19.2 19.3 Suszyński K, Marcol W, Górka D. Physiotherapeutic techniques used in the management of patients with peripheral nerve injuries. Neural regeneration research. 2015 Nov;10(11):1770. Available from: https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4705788/ (last accessed 15.3.2019).
  20. chrcquetta. Ankle Foot Orthosis. Available from: https://www.youtube.com/watch?v=6YcMaUIW5ms[3][4] (last accessed 16.3.2019)
  21. nabil ebraheim. Nerve Regeneration. Available from:https://www.youtube.com/watch?v=UaKuY1WYJcA[5][6] (last accessed 16.3.2019)

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