Hiroyasu Ogawa1,2, Kazu Matsumoto3, Takahiro Ogawa1,4, Kentaro Takeuchi1, Haruhiko Akiyama1. 1. Department of Orthopaedic Surgery, Gifu University Graduate School of Medicine, Yanagido 1-1, Gifu, Gifu, 501-1194, Japan. 2. Department of Advanced Joint Reconstructive Surgery, Gifu University Graduate School of Medicine, Gifu, 501-1193, Japan. 3. Department of Orthopaedic Surgery, Gifu University Graduate School of Medicine, Yanagido 1-1, Gifu, Gifu, 501-1194, Japan. mkazuu@gifu-u.ac.jp. 4. Department of Orthopaedic Surgery, Kizawa Memorial Hospital, Minokamo, 505-8503, Japan.
Abstract
PURPOSE: Medial opening wedge high tibial osteotomy (HTO) is a realignment of the lower limb. Despite accurate preoperative planning and careful surgical techniques, many HTOs result in alignment correction errors. These alignment correction errors may be due to soft tissue laxity around the knee such as varus or valgus laxity. The purpose of this study was to examine the relationship of varus and valgus laxity of the knee and alignment correction errors, and to have a formula to predict the subsequent degree of these correction errors. MATERIALS AND METHODS: Fifty knees from 41 patients undergoing opening wedge HTO for knee osteoarthritis were involved. Standing full-length anteroposterior radiographs of the lower limb and the tibia, and varus and valgus stress radiographs of the knee were used to evaluate alignment and joint laxity. Parameters were global correction (the change in the hip-knee-ankle angle), bony correction (the change in the medial proximal tibial angle), and soft tissue correction (global correction - bony correction). RESULTS: The average of global correction, bony correction, and soft tissue correction were 12.8° ± 4.3°, 9.4° ± 3.2°, and 3.4° ± 2.5°, respectively. Preoperative varus laxity was moderately correlated with soft tissue correction (R = 0.58), and in which the slope of the line in the scatter plot represented 0.59, implying that soft tissue correction increases by 0.59° for every 1° of preoperative varus laxity. CONCLUSIONS: Preoperative varus laxity is correlated with soft tissue correction, suggesting that more accurate alignment correction could be achieved by surgical planning taking into account preoperative varus laxity as a factor of soft tissue correction.
PURPOSE: Medial opening wedge high tibial osteotomy (HTO) is a realignment of the lower limb. Despite accurate preoperative planning and careful surgical techniques, many HTOs result in alignment correction errors. These alignment correction errors may be due to soft tissue laxity around the knee such as varus or valgus laxity. The purpose of this study was to examine the relationship of varus and valgus laxity of the knee and alignment correction errors, and to have a formula to predict the subsequent degree of these correction errors. MATERIALS AND METHODS: Fifty knees from 41 patients undergoing opening wedge HTO for knee osteoarthritis were involved. Standing full-length anteroposterior radiographs of the lower limb and the tibia, and varus and valgus stress radiographs of the knee were used to evaluate alignment and joint laxity. Parameters were global correction (the change in the hip-knee-ankle angle), bony correction (the change in the medial proximal tibial angle), and soft tissue correction (global correction - bony correction). RESULTS: The average of global correction, bony correction, and soft tissue correction were 12.8° ± 4.3°, 9.4° ± 3.2°, and 3.4° ± 2.5°, respectively. Preoperative varus laxity was moderately correlated with soft tissue correction (R = 0.58), and in which the slope of the line in the scatter plot represented 0.59, implying that soft tissue correction increases by 0.59° for every 1° of preoperative varus laxity. CONCLUSIONS: Preoperative varus laxity is correlated with soft tissue correction, suggesting that more accurate alignment correction could be achieved by surgical planning taking into account preoperative varus laxity as a factor of soft tissue correction.
Entities:
Keywords:
Alignment correction; High tibial osteotomy; Joint laxity; Overcorrection
Authors: Man Soo Kim; In Jun Koh; Yong Gyu Sung; Dong Chul Park; Sung Bin Han; Yong In Journal: BMC Musculoskelet Disord Date: 2021-06-25 Impact factor: 2.362