PMC8487397_01
(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 .
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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).
(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).
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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)).
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.
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The talar component was not well positioned in the anteroposterior (AP) plane, sitting lateral to the midline (Figure 3).
(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.
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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)).