Description: To compare the long-term outcome of tibial plateau leveling osteotomy (TPLO) and extracapsular repair (ECR) for treatment of a ruptured cranial cruciate ligament (RCCL). Dogs had TPLO (n = 15) or ECR (n = 23) for treatment of RCCL. Force plate gait analysis was performed for the control group at one time point and for treatment groups at serial points: preoperatively, 2 weeks, 8 weeks, 6 and 12 months postoperatively. Symmetry indices (SIs) were calculated between operated and unoperated pelvic limb for ground reaction forces (GRFs), including peak vertical force (PVF), contact time (CT), and vertical impulse (VI). GRFs of the treatment groups and control group were compared using a general linear model and Kaplan-Meier survival analysis