title: Patient specific instrumentation.
abstract: 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.
authors.affiliation: Suite 1020, Houston, Texas.
authors.forename: David R
authors.initials: DR
authors.lastname: Lionberger
authors.affiliation: Foundation for Southwest Orthopedic Research, Houston, Texas.
authors.forename: Catherine L
authors.initials: CL
authors.lastname: Crocker
authors.affiliation: Division of Behavioral Sciences and Division of Biostatistics, School of Public Health, University of Texas Health Science Center at Houston, Houston, Texas.
authors.forename: Vincent
authors.initials: V
authors.lastname: Chen
mesh_terms: D000328:Adult; D000368:Aged; D019645:Arthroplasty, Replacement, Knee / Q000191:economics* / Q000295:instrumentation* / Q000379:methods; D005102:Health Expenditures; D017721:Hospital Costs; D006801:Humans; D007720:Knee Prosthesis / Q000191:economics*; D008875:Middle Aged; D017059:Models, Econometric; D009873:Operating Rooms / Q000191:economics* / Q000458:organization & administration; D061646:Operative Time; D020370:Osteoarthritis, Knee / Q000191:economics / Q000601:surgery*; D017063:Outcome Assessment, Health Care / Q000191:economics; D025321:Surgery, Computer-Assisted / Q000191:economics* / Q000379:methods; D016896:Treatment Outcome; D055815:Young Adult
keywords: operating room efficiency; patient specific instrumentation; total knee arthroplasty