title: Injection nerve palsy.
abstract: OBJECTIVE
  To study the clinical profile and outcome of surgery for injection nerve palsies.
  
  
  METHODS
  This is a retrospective study of patients with INP who were treated at our institute during May 2000 to May 2009. Clinical, electroneuromyography (ENMG), and operative findings were noted. Intraoperative nerve action potential monitoring was not used in any case. Outcome of patients who were followed was reviewed.
  
  
  RESULTS
  INP comprised 92 (11%) of 837 nerve injury patients. Seventy one patients were children less than 16 years. The nerves involved were sciatic in 80 patients, radial in 8, and others in four. Fifty seven patients had power, grade 0/5. ENMG studies revealed absent compound muscle action potential in 64 and absent sensory nerve action potential in 67 patients. Thirty nine (42.3%) of 92 patients underwent surgery. The mean duration since injury in these patients was 5.2 months (3 months to 11 months). All underwent neurolysis. Only 18 patients who underwent surgery had a follow up of more than 3 months. Ten (55.5%) patients had good or fair outcome after surgery. Except for grade of motor deficit prior to surgery, none of the variables were found to significantly affect the outcome.
  
  
  CONCLUSIONS
  The outcome of INP is generally good and many patients recover spontaneously. The outcome of surgery is dependent on preoperative motor power.
authors.affiliation: Department of Neurosurgery, National Institute of Mental Health and Neurosciences, Bangalore, Karnataka, India.
authors.forename: Arindhom
authors.initials: A
authors.lastname: Kakati
authors.forename: Dhananjaya
authors.initials: D
authors.lastname: Bhat
authors.forename: Bhagavathula Indira
authors.initials: BI
authors.lastname: Devi
authors.forename: Dhaval
authors.initials: D
authors.lastname: Shukla
keywords: Injection; lesion in continuity; nerve injury; paralysis
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