These chasms are steep and are partially filled with debris, mostly talus and scree. Alpine plants usually occur in communities spaced between barren talus slopes. The pieces of rock collect at the bottom creating a "talus" or "scree". Kemp suffered an articular talar injury requiring microfracture surgery to his talus bone. It occurs at the meeting point of the talus and the calcaneus. Together, the talus and calcaneus form the hindfoot. Piles of talus and rockfall were created by retreating alpine glaciers. The inferior articular surface is quadrilateral, and smooth for articulation with the talus. Cliffs, talus, and caves provide refuge for several animals. The three aforementioned parts of bone articulate with the talus bone of the foot. Pikas rely on existing spaces in the talus for homes and do not dig burrows. The talus is most commonly fractured by two methods. The treatment of congenital vertical talus can be broadly classified into conservative and surgical. The most striking common feature is the talus, a bone in the upper ankle. Instead, they are caused by continuous freezing occurring within a talus lobe.