title: Effect of body mass index on limb alignment after total knee arthroplasty.
abstract: Prior studies have reported increased failure rates in obese patients with postoperative limb mal-alignment. This study was undertaken to determine if a relationship exists between postoperative limb alignment and BMI in patients undergoing primary TKA performed with mechanical instruments. An IRB-approved retrospective review of 196 knees was undertaken. Limb alignment was determined on full-length, standing, hip-to-ankle x-rays, preoperatively and postoperatively. The effects of gender, side, preoperative mechanical alignment and BMI on postoperative alignment were analyzed via multivariate regression analysis. Both preoperative mechanical limb alignment (P<0.001) and BMI (P=0.009) had a significant effect on postoperative limb alignment following TKA performed with mechanical instruments.
authors.affiliation: Banner Good Samaritan Orthopaedic Surgery Residency, Phoenix, Arizona.
authors.forename: Chris S
authors.initials: CS
authors.lastname: Estes
authors.forename: Kenneth J
authors.initials: KJ
authors.lastname: Schmidt
authors.forename: Ryan
authors.initials: R
authors.lastname: McLemore
authors.forename: Mark J
authors.initials: MJ
authors.lastname: Spangehl
authors.forename: Henry D
authors.initials: HD
authors.lastname: Clarke
mesh_terms: D019645:Arthroplasty, Replacement, Knee; D001696:Biomechanical Phenomena; D015992:Body Mass Index; D017760:Bone Malalignment / Q000000981:diagnostic imaging / Q000453:epidemiology*; D005260:Female; D005269:Femur / Q000000981:diagnostic imaging; D006801:Humans; D015994:Incidence; D007719:Knee Joint / Q000000981:diagnostic imaging / Q000601:surgery*; D008297:Male; D009765:Obesity / Q000150:complications*; D011859:Radiography; D012044:Regression Analysis; D012189:Retrospective Studies; D013977:Tibia / Q000000981:diagnostic imaging; D016896:Treatment Outcome
keywords: Mal-alignment; body mass index; complications; obesity; total knee arthroplasty