Comparison of sagittal and frontal plane alignment after open- and closed-wedge osteotomy: a matched-pair analysis.
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.
Schaefer
T K
TK
Department of Orthopaedic Surgery and Traumatology, Kantonsspital Bruderholz, Bruderholz, Switzerland. Thomas.Schaefer@ksbh.ch
Majewski
M
M
Hirschmann
M T
MT
Friederich
N F
NF
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*