Extreme variability in posterior slope of the proximal tibia: measurements on 2395 CT scans of patients undergoing UKA?
Data regarding the posterior slope of the tibia (PTS) are limited and sometimes conflicting. The purpose of this study was to determine the native posterior tibial slope in patients undergoing a medial or lateral UKA. A retrospective review was performed on 2395 CT scans in patients indicated for UKA, and the PTS of the osteoarthritic compartment was measured relative to a plane set perpendicular to the sagittal, tibial mechanical axis. The mean preoperative PTS in patients undergoing medial UKA was 6.8°+3.3°, with 34.3% between 4° and 7°. The mean preoperative PTS in patients undergoing lateral UKA was 8.0°+3.3°, with 27.5% between 4° and 7°. If attempting to recreate a patient's preoperative tibial slope, a routine target of 5° to 7° will produce a posterior slope less than the patient's native anatomy in 47% of patients undergoing UKA. This is the first, large CT-based review of posterior slope variation of the proximal tibia in patients undergoing UKA.
Washington University School of Medicine/Barnes-Jewish Hospital, St. Louis, Missouri.
Ryan M
RM
Nunley
Washington University School of Medicine/Barnes-Jewish Hospital, St. Louis, Missouri.
Denis
D
Nam
Washington University School of Medicine/Barnes-Jewish Hospital, St. Louis, Missouri.
Staci R
SR
Johnson
Arkansas Specialty Orthopaedics, Little Rock, Arkansas.
C Lowry
CL
Barnes
D019645:Arthroplasty, Replacement, Knee; D001696:Biomechanical Phenomena; D006801:Humans; D021621:Imaging, Three-Dimensional / Q000379:methods / Q000592:standards*; D007719:Knee Joint / Q000000981:diagnostic imaging / Q000502:physiology / Q000601:surgery; D020370:Osteoarthritis, Knee / Q000000981:diagnostic imaging / Q000503:physiopathology / Q000601:surgery; D011300:Preoperative Care / Q000379:methods / Q000592:standards; D015203:Reproducibility of Results; D012189:Retrospective Studies; D013977:Tibia / Q000000981:diagnostic imaging* / Q000502:physiology / Q000601:surgery*; D014057:Tomography, X-Ray Computed / Q000379:methods / Q000592:standards*
arthroplasty; knee; posterior slope; unicondylar