caa a22 4500 605456348 CHVBK 20210128100217.0 cr unu---uuuuu 210128e20150601xx s 000 0 eng 10.1007/s00167-014-3288-7 doi (NATIONALLICENCE)springer-10.1007/s00167-014-3288-7 Laxity after complete release of the medial collateral ligament in primary total knee arthroplasty [Elektronische Daten] [Woo-Shin Cho, Seong-Eun Byun, Sang-Jun Lee, Jaeyoun Yoon] Purpose: Medial collateral ligament (MCL) release is one of the essential steps toward the achievement of ligament balancing during the total knee arthroplasty (TKA) in patients with varus deformity. When the varus deformity is severe, complete release of the MCL until balanced is often required. However, it is believed that complete MCL release may lead to catastrophic laxity. The purpose of this prospective study is to compare the medial joint gap opening in postoperative valgus stress radiograph in patients with complete MCL release against patients with partial release. Methods: Out of 209 primary TKAs performed for degenerative osteoarthritis, complete MCL release was required in 33 cases (group I) by sub-periosteal detachment at proximal tibia using periosteal elevator. For the remaining 176 knees (group II), partial release of MCL was done. At postoperative 6months and 1year, both groups were evaluated for comparing the joint gap on valgus stress radiographs using modified Telos device in 0°, 45°, and 90° of flexion. Additional parameters which were analyzed included preoperative varus and valgus stress radiographs in full extension and pre- and postoperative mechanical alignment in each group. The knee range of motion (ROM) and clinical scores were evaluated at 1-year follow-up. Results: The mean values of the joint opening on the postoperative valgus stress test with the knee joint extended, and in the 45° and 90° flexed states at 6months and at 1year postoperatively in group I were not statistically significantly different from those of group II. The clinical scores also did not show a statistically significant difference between two groups. There was a statistically significant difference in ROM between two groups, pre- and postoperatively and the difference was 5°, respectively. Conclusion: This study suggests that complete MCL release for ligament balancing is a safe procedure and does not lead to postoperative laxity. European Society of Sports Traumatology, Knee Surgery, Arthroscopy (ESSKA), 2014 Complete medial collateral ligament release nationallicence Ligament balancing nationallicence Total knee arthroplasty nationallicence Cho Woo-Shin Department of Orthopaedic Surgery, Asan Medical Center, College of Medicine, University of Ulsan, Seoul, Republic of Korea aut Byun Seong-Eun Department of Orthopaedic Surgery, CHA Bundang Medical Center, College of Medicine, CHA University, Seongnam-si, Gyeonggi-do, Republic of Korea aut Lee Sang-Jun Department of Orthopaedic Surgery, Teunteun Hospital, Guri-si, Gyeonggi-do, Republic of Korea aut Yoon Jaeyoun Department of Orthopaedic Surgery, Asan Medical Center, College of Medicine, University of Ulsan, Seoul, Republic of Korea aut Knee Surgery, Sports Traumatology, Arthroscopy Springer Berlin Heidelberg 23/6(2015-06-01), 1816-1823 0942-2056 23:6<1816 2015 23 167 https://doi.org/10.1007/s00167-014-3288-7 text/html Onlinezugriff via DOI BK010053 XK010053 XK010000 Metadata rights reserved Springer special CC-BY-NC licence nationallicence 1 research-article jats NATIONALLICENCE NATIONALLICENCE NL-springer NATIONALLICENCE 856 40 https://doi.org/10.1007/s00167-014-3288-7 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Cho Woo-Shin Department of Orthopaedic Surgery, Asan Medical Center, College of Medicine, University of Ulsan, Seoul, Republic of Korea aut NATIONALLICENCE 700 1- Byun Seong-Eun Department of Orthopaedic Surgery, CHA Bundang Medical Center, College of Medicine, CHA University, Seongnam-si, Gyeonggi-do, Republic of Korea aut NATIONALLICENCE 700 1- Lee Sang-Jun Department of Orthopaedic Surgery, Teunteun Hospital, Guri-si, Gyeonggi-do, Republic of Korea aut NATIONALLICENCE 700 1- Yoon Jaeyoun Department of Orthopaedic Surgery, Asan Medical Center, College of Medicine, University of Ulsan, Seoul, Republic of Korea aut NATIONALLICENCE 773 0- Knee Surgery, Sports Traumatology, Arthroscopy Springer Berlin Heidelberg 23/6(2015-06-01), 1816-1823 0942-2056 23:6<1816 2015 23 167