Coronal Correction for Post-Traumatic Malalignment Using Robot-Assisted Total Knee Arthroplasty: A Case Series

BACKGROUND: Achieving proper axis alignment can be difficult in the presence of posttraumatic extra-articular deformities in either the femur or the tibia. We present radiological outcomes following robot-assisted total knee arthroplasty (TKA) in patients with osteoarthritis of the knee accompanied by posttraumatic extra-articular deformities. METHODS: We analyzed the outcomes of five knees in five patients with (1) Kellgren-Lawrence (K-L) Grade III–IV osteoarthritic knees, (2) the presence of posttraumatic extra-articular deformities either in the femur or the tibia, and (3) who underwent robot-assisted TKA. Their radiological findings were evaluated. RESULTS: All five knees with initial deformity (mean 14.8°, range 12.7–18.5°) were corrected to neutral alignment (mean 0.7°, range −1.1–2.7°). There was no postoperative outlier of hip-knee-ankle (HKA) angle. CONCLUSION: Our results indicate that robot-assisted TKA can be used to achieve proper limb alignment in patients with posttraumatic extra-articular deformities.