Does total knee arthroplasty modify flexion axis of the knee?

被引:7
|
作者
Iacono, F. [1 ]
Bruni, D. [1 ]
Bignozzi, S. [2 ]
Colle, F. [2 ,3 ,4 ]
Marcacci, M. [1 ,2 ,4 ]
机构
[1] Rizzoli Orthopaed Inst, Orthopaed & Traumatol Clin 2, I-40136 Bologna, Italy
[2] Rizzoli Orthopaed Inst, Biomech & Innovat Technol Lab, I-40136 Bologna, Italy
[3] Scuola Super Sant Anna, BioRobot Inst, Pisa, Italy
[4] Rizzoli Orthopaed Inst, Nanobiotechnol Lab Nabi, I-40136 Bologna, Italy
关键词
Total knee arthroplasty; Functional flexion axis; Computer-assisted surgery; Varus alignment; FEMORAL ROTATIONAL ALIGNMENT; JOINT COORDINATE SYSTEM; IN-VIVO; STANDARDIZATION PROPOSAL; TRANSEPICONDYLAR AXIS; NAVIGATION SYSTEM; EPICONDYLAR AXIS; HELICAL AXIS; DISTAL FEMUR; REPLACEMENT;
D O I
10.1007/s00167-014-3054-x
中图分类号
R826.8 [整形外科学]; R782.2 [口腔颌面部整形外科学]; R726.2 [小儿整形外科学]; R62 [整形外科学(修复外科学)];
学科分类号
摘要
To prospectively investigate whether preoperative functional flexion axis in patients with osteoarthritis- and varus-alignment changes after total knee arthroplasty and whether a correlation exists both between preoperative functional flexion axis and native limb deformity. A navigated total knee arthroplasty was performed in 108 patients using a specific software to acquire passive joint kinematics before and after implant positioning. The knee was cycled through three passive range of motions, from 0A degrees to 120A degrees. Functional flexion axis was computed using the mean helical axis algorithm. The angle between the functional flexion axis and the surgical transepicondylar axis was determined on frontal (alpha (F)) and axial (alpha (A)) plane. The pre- and postoperative hip-knee-ankle angle, related to femur mechanical axis, was determined. Postoperative functional flexion axis was different from preoperative only on frontal plane, while no differences were found on axial plane. No correlation was found between preoperative alpha (A) and native limb deformity, while a poor correlation was found in frontal plane, between alpha (F) and preoperative hip-knee-ankle angle. Total knee arthroplasty affects functional flexion axis only on frontal plane while has no effect on axial plane. Preoperative functional flexion axis is in a more varus position respect to the transepicondylar axis both in pre- and postoperative conditions. Moreover, the position of the functional axis on frontal plane in preoperative conditions is dependent on native limb alignment, while on axial plane is not dependent on the amount of preoperative varus deformity.
引用
收藏
页码:1728 / 1735
页数:8
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