ankle

The ankle is the region where the foot and the leg meet. The ankle includes three joints. In common usage, the term ankle refers exclusively to the ankle region. In medical terminology, "ankle" (without qualifiers [限定词]) can refer broadly to the region or specifically to the talocrural joint [距骨关节].

The main bones of the ankle region are the talus [距骨] (in the foot), and the tibia [胫骨] and fibula [腓骨] (in the leg).

百度翻译|汉典:
距: 1. 相隔的空间和时间; 2. 雄鸡爪子后面突出像脚趾的部分。So, 距离是用脚量出来的距离。
胫: 小腿，从膝盖到脚跟的一段。shin
腓: 胫骨后的肉。亦称“腓肠肌”，俗称“腿肚子”。calf

The ankle joint is bound by the strong deltoid ligament [三角肌韧带] and three lateral ligaments [侧韧带]. multilateral: 多边; unilateral: 单边。

Of all major joints, the ankle is the most commonly injured. If the outside surface of the foot is twisted under the leg during weight bearing, the lateral ligament, especially the anterior talofibular portion [距腓前部], is subject to tearing (a sprain) as it is weaker than the medial ligament and it resists inward rotation of the talocrural joint.

有啥别有病，脚扭了去医院：“治俺这个距腓前部巨费钱不？”