Two-year results of the PHANTOM High Flex Trial: a single-arm study on the Atlas Unicompartmental Knee System load absorber in patients with medial compartment osteoarthritis of the knee - Slynarski, K; Walawski, J; Smigielski, R; van der Merwe, W (Clin Med Insights Arthritis Musculoskelet Disord, 2019)