Good accuracy of the Phase III Oxford Mobile Bearing Unicompartmental Knee Instrumentation

被引:6
作者
Bitsch, Rudi G. [1 ]
von Keudell, Arvind [2 ]
Losina, Elena [2 ]
Fitz, Wolfgang [2 ]
机构
[1] Univ Heidelberg Hosp, Dept Orthoped Trauma Surg & Paraplegiol, Heidelberg, Germany
[2] Brigham & Womens Hosp, Dept Orthopaed Surg, Boston, MA 02115 USA
关键词
SURVIVAL ANALYSIS; ARTHROPLASTY; REPLACEMENT; KINEMATICS; LAXITY;
D O I
10.3109/17453674.2013.813801
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
100224 [整形外科学];
摘要
Background and purpose - Unicompartmental knee arthroplasty (UKA) needs careful balancing of flexion/extension (F/E) gaps to prevent dislocation of the mobile meniscal bearing. Assessment of gaps is based on the surgeon's subjective insertion force of a feeler gauge with different thicknesses and/or the lift-off of a trial meniscal bearing. However, the accuracy of this method remains unclear. We assessed the accuracy of the technique. Patients and methods - A consecutive series of 33 UKAs in 32 patients (mean age 64 years, 24 women) were balanced using the Oxford Phase III (OP III) Instrumentation. The recommended technique for F/E gap assessment was performed using different feeler gauges with 1-mm increments and the meniscal bearing lift-off tests according to surgical technique. A tensiometer was inserted and both gaps were maximally distracted by hand. Measurements in mm were recorded and analyzed with a reading of 90 N for both gaps in 20 and 90 degrees of flexion. Results - The gaps measured were 12 (11-18) mm in extension and 13 (11-18) mm in 90 degrees of flexion. The difference between the gaps was 0.4 (-0.5 to 1.0) mm (p < 0.001). There were no statistically significant gender differences regarding composite implant thickness, laxity, flexion gap, extension gap, or gap difference. Interpretation - OP III instrumentation using feeler gauges and the lift-off test provides accurate balancing of F/E gaps with an accuracy of less than 1 mm.
引用
收藏
页码:406 / 409
页数:4
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