Electromyographic Evaluation of the Midvastus Approach

David F. Dalury, Robert G. Snow, Mary Jo Adams

Research output: Contribution to journalArticlepeer-review

21 Scopus citations


Compared with the standard median parapatellar approach, the muscle-splitting midvastus approach to the knee has led to claims of an easier and earlier recovery after total knee arthroplasty, but some investigators have questioned whether the midvastus approach damages the vastus medialis obliquus. We used electromyographic and nerve conduction studies to evaluate whether we could document any such damage. Twenty patients undergoing bilateral total knee arthroplasty were randomized prospectively for the treatment of 1 knee with each of the 2 approaches. Radiographs, electromyographies, nerve conduction studies, range-of-motion tests, and Knee Society function and pain tests were conducted preoperatively and at 6 weeks postoperatively. If the electromyography or nerve conduction tests were abnormal at 6 weeks, the tests were repeated at 12 weeks. At the final follow-up, these studies showed no evidence of muscle denervation. The midvastus approach appears to be a safe alternative for knee arthrotomy for total knee arthroplasty without concerns for damage to the vastus medialis obliquus.

Original languageEnglish (US)
Pages (from-to)136-140
Number of pages5
JournalJournal of Arthroplasty
Issue number1
StatePublished - Jan 1 2008


  • electromyography
  • midvastus approach
  • outcome
  • parapatellar approach
  • total knee arthroplasty

ASJC Scopus subject areas

  • Orthopedics and Sports Medicine


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