Figure 2: Case 2. (a) Before primary TKA surgery. (b) After primary TKA surgery. Tibial component was implanted with2 degrees of varus and 5 degrees of posterior slope. (c)Three months after the primary TKA. A radiolucent area below the tibial component was clearly observed. (d) 9 months after the primary TKA. A sinking of the tibial component and varus deformity had occurred. (e) A year after initial TKA tibial component revision was performed.