Knee Surg Relat Res.  2019 Jun;31(2):126-131. 10.5792/ksrr.18.034.

Disparity between Preoperative Target Correction Amount and Postoperative Correction Amount in Open Wedge High Tibial Osteotomy

• Lee OS
• Lee ES
• Lee YS

• KMID: 2451847
• DOI: http://doi.org/10.5792/ksrr.18.034

Abstract

PURPOSE
The purpose of this study was to evaluate the disparity between the preoperative target correction amount and the postoperative correction amount in open wedge high tibial osteotomy (OWHTO) in patients divided according to the planned osteotomy gap.
MATERIALS AND METHODS
Seventy-two patients were divided into two groups (group 1 with the planned opening gap lager than the mean opening gap length of total patients and group 2 with a smaller opening gap). The opening gap was determined according to the target weight bearing line (WBL) ratio on the preoperative whole leg radiograph. Absolute and relative values of the disparity between the target and postoperative WBL ratios were compared between groups in order to clarify whether the disparity was deviated toward over- or under-correction.
RESULTS
The absolute value of disparity between the target and postoperative WBL ratios in group 1 was significantly larger than that in group 2 (6.01%±5.68% vs. 3.32%±3.38%; p=0.02). However, there was no statistically significant difference in relative values between groups (p=0.54).
CONCLUSIONS
The postoperative WBL ratio after OWHTO was different from the preoperative target WBL ratio if the planned osteotomy gap was large. This mismatch was not deviated toward one side, either over- or under-correction.

Keyword

Knee; Osteoarthritis; Varus deformity; Osteotomy

MeSH Terms

Humans
Knee
Leg
Osteoarthritis
Osteotomy*
Weight-Bearing