Patient specific instrumentation

David R. Lionberger, Catherine L. Crocker, Vincent Chen

Research output: Contribution to journalArticlepeer-review

19 Scopus citations


Patient specific instrumentation (PSI) has recently been developed as a replacement for traditional instrumentation in total knee arthroplasty (TKA). The study aim was to assess efficiency via the mean total OR time using the PSI versus computer-assisted (CAS) TKAs with accuracy as a secondary endpoint. Sixty patients were randomized to CAS or PSI. A formula was developed to derive a profit ratio (PR) that incorporated costs, revenue, and total OR time. The PSI cases were 1.45 times more profitable than CAS allowing for approximately 3 PSI cases versus 2 CAS cases in one 8 hour OR day. Results from this series show that PSI improves OR efficiency, but does not improve accuracy.

Original languageEnglish (US)
Pages (from-to)1699-1704
Number of pages6
JournalJournal of Arthroplasty
Issue number9
StatePublished - 2014


  • Operating room efficiency
  • Patient specific instrumentation
  • Total knee arthroplasty

ASJC Scopus subject areas

  • Orthopedics and Sports Medicine


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