case_images: PMC8487397_01
case_images: (a) An anteroposterior (AP) radiograph of a 72-year-old male patient who developed Takakura's classification stage 4 osteoarthritic changes of the left ankle that failed to respond to conservative management. (b) An AP radiograph of Kellgren-Lawrence Grade IV osteoarthritic changes in the left knee (c) A preoperative standing AP radiograph of the bilateral lower extremities showed a left hip-knee-ankle (HKA) angle of 14.3 .
case_images: CRIOR2021-5245396.001.jpg
case_images: PMC8487397_01_CRIOR2021-5245396.001.jpg
case_images: fig1
case_images: The osteoarthritic stage of the ankle was Takakura's classification stage 4 (Figure 1). A Kellgren-Lawrence (K-L) grade IV osteoarthritic change of the left knee was documented (Figure 1). A weight-bearing X-ray revealed a severe varus deformity, and the hip-knee-ankle (HKA) angle was 14.3  (Figure 1).
case_images: (a) The patient underwent total ankle arthroplasty (TAA). (b) Three months after TAA. The radiological assessment revealed a radiolucent line and osteolysis (yellow arrow) of the tibial component (standing view).
case_images: CRIOR2021-5245396.002.jpg
case_images: PMC8487397_01_CRIOR2021-5245396.002.jpg
case_images: fig2
case_images: Ankle Replacement (Corin, Cirencester, Gloucestershire, United Kingdom) (Figure 2(a)). Plain radiographs demonstrated a radiolucent line and osteolysis of the medial tibial component (Figure 2(b)).
case_images: Six months after the TAA. (a, b) The radiological assessment revealed a progressive radiolucent line and osteolysis of the tibial component. (c) A lateral radiograph showed subsidence and a continuous radiolucency around the entire talar component.
case_images: CRIOR2021-5245396.003.jpg
case_images: PMC8487397_01_CRIOR2021-5245396.003.jpg
case_images: fig3
case_images: The talar component was not well positioned in the anteroposterior (AP) plane, sitting lateral to the midline (Figure 3).
case_images: (a, b) The patient underwent tibiotalocalcaneal arthrodesis surgery. (c) Six months after tibiotalocalcaneal arthrodesis surgery, he underwent left total knee arthroplasty (TKA). A standing AP radiograph of the bilateral lower extremities revealed a 1.1  left HKA angle.
case_images: CRIOR2021-5245396.004.jpg
case_images: PMC8487397_01_CRIOR2021-5245396.004.jpg
case_images: fig4
case_images: The patient underwent tibiotalocalcaneal arthrodesis surgery (Figure 4(a)). Six months after the ankle arthrodesis surgery, he underwent left total knee arthroplasty (TKA) and recovered without any complications (Figure 4(c)).