title: Asymmetry of the leg alignment affects trunk bending in the coronal plane after unilateral total knee arthroplasty.
abstract: Unilateral total knee arthroplasty (TKA) would produce asymmetric changes of lower extremity in patients with bilateral varus deformity. Our purpose was to investigate whether asymmetry of the leg alignment would affect trunk bending in the coronal plane after unilateral TKA. Twenty patients (mean 76 years old) with bilateral end-stage knee osteoarthritis (OA) participated. Spine images during relaxed standing were obtained on pre- and postoperative day 21. As a result, the shoulder tilted more to the TKA side and the pelvis inclined more to the contralateral OA side. These results suggested that the trunk would bend away from the contralateral OA side after unilateral TKA in patients with bilateral end-stage knee OA and varus deformity. Asymmetry of the leg alignment led to asymmetric trunk bending.
authors.affiliation: Department of Orthopaedic Surgery, National Hospital Organization, Tochigi National Hospital, Tochigi prefecture, Japan.
authors.forename: Kengo
authors.initials: K
authors.lastname: Harato
authors.forename: Hiroki
authors.initials: H
authors.lastname: Yoshida
authors.forename: Toshiro
authors.initials: T
authors.lastname: Otani
mesh_terms: D000368:Aged; D000369:Aged, 80 and over; D019645:Arthroplasty, Replacement, Knee / Q000379:methods*; D017760:Bone Malalignment / Q000000981:diagnostic imaging / Q000503:physiopathology*; D005260:Female; D050488:Hallux Varus / Q000000981:diagnostic imaging / Q000503:physiopathology* / Q000601:surgery*; D006801:Humans; D008297:Male; D020370:Osteoarthritis, Knee / Q000000981:diagnostic imaging / Q000503:physiopathology* / Q000601:surgery*; D011446:Prospective Studies; D013902:Radiography, Thoracic; D013909:Thorax / Q000503:physiopathology*
keywords: asymmetry; bilateral end-stage OA; leg alignment; radiograph; unilateral TKA