title: Revision TKA for Flexion Instability Improves Patient Reported Outcomes.
abstract: Instability is a major cause of early revision of total knee arthroplasty (TKA), of which flexion instability is a major subset. We analyzed radiologically evident corrections, patient reported outcome and complications associated with revision TKA for flexion instability in a retrospective cohort of 37 patients with minimum one year follow up. Following revision surgery, there was a significant increase in mean posterior condylar offset ratio and a significant decrease in tibial slope while the level of joint line was not significantly altered. Patient reported version of knee society score showed significant improvement with surgery and 26 of 37 patient reported perceptible improvement on a 7-point Likert scale.
  
  
  METHODS
  Level IV, Case series. See the Guidelines for Authors for a complete description of levels of evidence.
authors.affiliation: Department of Orthopaedic Surgery, Virginia Commonwealth University, Richmond, Virginia.
authors.forename: Arun
authors.initials: A
authors.lastname: Kannan
authors.affiliation: School of Medicine, Virginia Commonwealth University, Richmond, Virginia.
authors.forename: Robert S
authors.initials: RS
authors.lastname: O'Connell
authors.affiliation: Chester Orthopedics and Sports Medicine, Chester, South Carolina.
authors.forename: Niraj
authors.initials: N
authors.lastname: Kalore
authors.affiliation: Department of Orthopaedic Surgery, Virginia Commonwealth University, Richmond, Virginia.
authors.forename: Brian M
authors.initials: BM
authors.lastname: Curtin
authors.affiliation: Tuckahoe Orthopaedics, Richmond, Virginia.
authors.forename: Jason R
authors.initials: JR
authors.lastname: Hull
authors.affiliation: Department of Orthopaedic Surgery, Virginia Commonwealth University, Richmond, Virginia.
authors.forename: William A
authors.initials: WA
authors.lastname: Jiranek
mesh_terms: D000328:Adult; D000368:Aged; D000369:Aged, 80 and over; D019645:Arthroplasty, Replacement, Knee / Q000379:methods*; D005260:Female; D006801:Humans; D007719:Knee Joint / Q000000981:diagnostic imaging / Q000601:surgery; D008297:Male; D008875:Middle Aged; D063868:Patient Outcome Assessment; D011859:Radiography; D016059:Range of Motion, Articular; D012086:Reoperation; D012189:Retrospective Studies; D013977:Tibia / Q000601:surgery
keywords: flexion instability; instability; knee arthroplasty; patient reported outcome; revision