Fixed-bearing medial unicompartmental knee arthroplasty: New indications in the anterior cruciate ligament-deficient knee.

The anterior cruciate ligament (ACL)-deficient osteoarthritic knee presents a challenging disease entity, which requires careful thought to restore function and enable return to activities. Advancements in technology and surgical techniques have expanded indications for unicompartmental knee arthroplasty (UKA), to inlcude ACL-deficiency in appropriately-selected patients. An improved understanding of the ACL-deficient osteoarthritic knee can aid in clinical and surgeon decision-making to restore knee function. This review will discuss current practice guidelines for the ACL-deficient knee with single-compartment osteoarthritis, including pathoanatomy, indications, contraindications, technical considerations, and clinical outcomes.