Final answer:
The calcaneofibular ligament is involved in fractures of the anterior process of the calcaneus, supporting the talus at the ankle joint and resisting excessive foot inversion.
Step-by-step explanation:
The ligament involved in fractures of the anterior process of the calcaneus is the calcaneofibular ligament. This is an intrinsic ligament located on the lateral side of the ankle joint, which spans between the calcaneus bone and the lateral malleolus of the fibula. Its primary functions are to support the talus bone at the ankle joint and to resist excess inversion of the foot. In addition, given its position and structural connections, it is susceptible to injury when the anterior process of the calcaneus is fractured.
Fractures in this area can impact the stability and function of the ankle joint due to the involvement of the calcaneofibular ligament. The ankle is also supported laterally by the anterior and posterior talofibular ligaments, which, together with the calcaneofibular ligament, help to resist abnormal movements and provide stability to the ankle during various motions like dorsiflexion and plantar flexion.