Unicompartmental knee arthroplasty is an alternative to total knee arthroplasty in patients with isolated medial arthritis. Unicompartmental knee arthroplasty restores native tibial and femoral joint surfaces and corrects pre-disease limb alignment, which restores natural knee biomechanics, ensuring effective functional recovery. Proper patient selection and accurate surgical technique contribute to good functional outcomes and long-term implant survival. This video demonstrates key steps of unicompartmental knee arthroplasty and discusses multiple tips and tricks, including (1) preoperative assessment and planning; (2) patient positioning and setup; (3) exposure; (4) instrument options and surgical technique; (5) distal femoral resection; (6) proximal tibial resection; (7) assessment of alignment and gaps; (8) finishing the femur, including sizing, position, and posterior resection; (9) finishing the tibia, including sizing and position; (10) trialing the implant; (11) implanting final components, including cementing technique; (12) closure; and (13) postoperative rehabilitation. Following these surgical steps and principles will lead to excellent long-term functional outcomes with a low rate of revision and minimal complications.