The possible causes of ankle sprain without fracture but unable to stand and walk are medial collateral ligament tear, intra-articular cartilage injury and so on.
1. Tear of the medial collateral ligament: the ankle joint is composed of bony and soft tissue structures, and the medial collateral ligament around the ankle is an important soft tissue structure that maintains the stability of the ankle joint. After an ankle sprain that results in a tear of the medial collateral ligament, the stability of the ankle joint deteriorates, and pain may occur during walking activities. Therefore, even if there is no fracture, ankle sprain can not stand and walk in a short period of time.
2. Intra-articular cartilage damage: The articular cartilage on the surface of the joint plays an important role in the stability of the ankle joint and the smoothness of its activities. If the cartilage is damaged, it will increase the friction between the bones of the ankle joint, which will lead to smaller joint space and pain, and even lead to traumatic arthritis, so even if there is no fracture, you cannot stand and walk for a short period of time.
It is recommended to go to the hospital in time after ankle sprain, to clarify the cause of the disease and timely treatment, in order to create good conditions for the recovery of the ankle tissues and structures.