Young Gon Na1, Beom Koo Lee2, Do Hyun Hwang1, Eun Seok Choi3, Jae Ang Sim4. 1. Department of Orthopaedic Surgery, Gachon University Gil Medical Center, Gachon University College of Medicine, 21, Namdong-daero 774 beon-gil, Namdong-gu, Incheon, Republic of Korea. 2. Department of Orthopaedic Surgery, Armed Forces Capital Hospital, Seongnam, Gyeonggi-do, 81, Saemaeul-ro 177 beon-gil, Bundang-gu, Seongnam-si, Gyeonggi-do, Republic of Korea. 3. Department of Orthopaedic Surgery, Chungnam Nationl University Hospital, 282, Munhwa-ro, Jung-gu, Daejeon, Republic of Korea. 4. Department of Orthopaedic Surgery, Gachon University Gil Medical Center, Gachon University College of Medicine, 21, Namdong-daero 774 beon-gil, Namdong-gu, Incheon, Republic of Korea. Electronic address: sim_ja@gilhospital.com.
Abstract
BACKGROUND: Whether osteoarthritic patients with mild varus deformity can be indicated for high tibial osteotomy (HTO) is not established. We examined the preoperative characteristics and postoperative outcomes of HTO in patients with mild genu varum compared to patients with greater varus deformity. METHODS: Seventy-one patients who underwent HTO were included in this retrospective study. Patients were divided into either mild varus (MV, mechanical femorotibial angle (mFTA) ≤4°, n = 31 (44%)) and greater varus (GV, mFTA >4°, n = 40 (56%)) groups. Preoperative characteristics on single photon emission computed tomography-computed tomography (SPECT-CT), magnetic resonance image and radiograph were evaluated. Alignment parameters and functional outcomes were compared pre- and postoperatively between the groups. RESULTS: Preoperative characteristics were similar between the two groups, except the severity of arthritis and coronal alignment. There was no difference in the proportion of hot uptake in the medial compartment; medial meniscus posterior horn root tear, complex or radial tear; bone marrow edema. Full-thickness cartilage defect of medial compartment was more frequent and arthritis grade was also more severe in GV group. Coronal alignment of the MV group was corrected into more valgus than the GV group (4.5° vs. 2.8° in mFTA, P = 0.012). Pre- and postoperative Knee Society knee and function scores were also comparable in the two groups. CONCLUSIONS: Mild varus patients are similar to greater varus patients regarding preoperative features and achieve the comparable functional outcome. A selected subset of osteoarthritic patients with mild varus deformity might be indicated for HTO. LEVEL OF EVIDENCE: III (Retrospective comparative study).
BACKGROUND: Whether osteoarthritic patients with mild varus deformity can be indicated for high tibial osteotomy (HTO) is not established. We examined the preoperative characteristics and postoperative outcomes of HTO in patients with mild genu varum compared to patients with greater varus deformity. METHODS: Seventy-one patients who underwent HTO were included in this retrospective study. Patients were divided into either mild varus (MV, mechanical femorotibial angle (mFTA) ≤4°, n = 31 (44%)) and greater varus (GV, mFTA >4°, n = 40 (56%)) groups. Preoperative characteristics on single photon emission computed tomography-computed tomography (SPECT-CT), magnetic resonance image and radiograph were evaluated. Alignment parameters and functional outcomes were compared pre- and postoperatively between the groups. RESULTS: Preoperative characteristics were similar between the two groups, except the severity of arthritis and coronal alignment. There was no difference in the proportion of hot uptake in the medial compartment; medial meniscus posterior horn root tear, complex or radial tear; bone marrow edema. Full-thickness cartilage defect of medial compartment was more frequent and arthritis grade was also more severe in GV group. Coronal alignment of the MV group was corrected into more valgus than the GV group (4.5° vs. 2.8° in mFTA, P = 0.012). Pre- and postoperative Knee Society knee and function scores were also comparable in the two groups. CONCLUSIONS: Mild varus patients are similar to greater varus patients regarding preoperative features and achieve the comparable functional outcome. A selected subset of osteoarthritic patients with mild varus deformity might be indicated for HTO. LEVEL OF EVIDENCE: III (Retrospective comparative study).
Authors: Matthias J Feucht; Philipp W Winkler; Julian Mehl; Gerrit Bode; Philipp Forkel; Andreas B Imhoff; Patricia M Lutz Journal: Knee Surg Sports Traumatol Arthrosc Date: 2020-07-20 Impact factor: 4.342