Design and evaluation of a 3D printed mechanical balancer for soft tissue balancing in total knee replacement

被引:0
|
作者
Anil, Utkarsh [1 ]
Lin, Charles [1 ]
Bieganowski, Thomas [1 ]
Hennessy, Daniel [1 ]
Schwarzkopf, Ran [1 ]
Walker, Peter S. [1 ]
机构
[1] NYU Langone Orthoped Hosp, 301 East 17th St, New York, NY 10003 USA
来源
KNEE | 2023年 / 44卷
关键词
Total Knee Arthroplasty; Knee Balancer design; 3d printed Knee Balancer; Soft Tissue Balancing; Total Knee balancing; LENGTH-CHANGE PATTERNS; COLLATERAL LIGAMENTS; ARTHROPLASTY; FLEXION; ALIGNMENT; LAXITY; GAP;
D O I
10.1016/j.knee.2023.07.013
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
Purpose: Soft tissue balancing is an important step in a total knee procedure, carried out manually, or using an indicator. The purpose of this study was to evaluate our design of 3D printed Balancer, and demonstrate how it could be used at surgery.Procedures: When inserted between the femur and tibia, the Balancer displayed the forces acting across the lateral and medial compartments, indicated by pointers at the end of the handle. A loading rig was used to measure the pointer deflections for different forces applied at different locations on the condyle surfaces. Repeatability and reproducibilty were evaluated. The Balancer was tested in six fresh knee specimens using a surgical simulation rig. Main findings: Pointer deflections of up to 12 millimeters occurred for less than 1 mm displacements at the condyle surfaces. Reproducibility tests showed a standard deviation of 14% at lower loads, reducing to only 4% at higher loads. Mean pointer deflections were within 8% for forces applied at & PLUSMN;10 mm AP, and +5/-3 mm in an ML direction, relative to the neutral contact point. In specimens, most lateral to medial force differences could be corrected by a 2 & DEG; change in frontal plane angle of the tibial resection. Effects of ligament releases were also demonstrated.Principal conclusions: The 3D printed Balancer was easy to use, and provided the surgeon with lateral and medial force data over a full range of flexion, enabling possible corrective procedures to be specified.& COPY; 2023 The Authors. Published by Elsevier B.V. This is an open access article under the CC BY-NC-ND license (http://creativecommons.org/licenses/by-nc-nd/4.0/).
引用
收藏
页码:118 / 129
页数:12
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