title: Comparison of sagittal and frontal plane alignment after open- and closed-wedge osteotomy: a matched-pair analysis.
abstract: High tibial osteotomy (HTO) is a procedure for treating medial compartment osteoarthritis (OA) of the varus deformed knee. Frontal and sagittal alignment after closed- and open-wedge HTO were compared radiologically in a matched-pair study. The mean intra-operative frontal plane correction (FT axis) was +7.5 degrees for closed-wedge HTO and +8 degrees for open-wedge HTO; it increased by +0.5 degrees in closed-wedge HTO and decreased by -0.5 degrees in open-wedge HTO at last follow-up. Post-operatively, tibial slope had decreased by -0.5 degrees in closed-wedge HTO and increased significantly by +3 degrees in open-wedge HTO. Both techniques effectively and safely corrected varus deformity. A high degree of stability of the frontal plane correction was noted, however a significant change in the tibial slope after open-wedge HTO was observed post-operatively. As no loss of correction was shown, it may be related to the surgical technique rather than to the implant used.
authors.affiliation: Department of Orthopaedic Surgery and Traumatology, Kantonsspital Bruderholz, Bruderholz, Switzerland. Thomas.Schaefer@ksbh.ch
authors.forename: T K
authors.initials: TK
authors.lastname: Schaefer
authors.forename: M
authors.initials: M
authors.lastname: Majewski
authors.forename: M T
authors.initials: MT
authors.lastname: Hirschmann
authors.forename: N F
authors.initials: NF
authors.lastname: Friederich
mesh_terms: D001696:Biomechanical Phenomena; D017760:Bone Malalignment / Q000601:surgery; D006801:Humans; D016268:Internal Fixators; D016555:Matched-Pair Analysis; D020370:Osteoarthritis, Knee / Q000473:pathology / Q000601:surgery*; D010027:Osteotomy / Q000295:instrumentation / Q000379:methods*; D011859:Radiography; D013977:Tibia / Q000000981:diagnostic imaging / Q000601:surgery*