Possible causes of limited ankle dorsiflexion include skeletal, soft tissue, and neurologic factors. 1. Skeletal factors: The main bones affecting ankle dorsiflexion include the tibia and the bones of the foot, and if these bones are diseased, ankle dorsiflexion may be limited. 2. Soft tissue factors: Dorsiflexion of the ankle joint may be affected by lesions of the peripheral muscles and extensor tendons of the foot. 3. Neurological factors: If the nerves that innervate the ankle dorsiflexion muscles become diseased, dorsiflexion of the ankle may be limited. The most common cause is compression of the L4-L5 nerve roots of the lumbar spine, which affects the electrical signaling of the nerves in the lower extremities. Other conditions involving the L4-L5 roots of the lumbar spine can also present with this symptom. There are many different causes of ankle dorsiflexion restriction. Once it occurs, you should go to the hospital in time to clarify the cause of the disease and guide the treatment under the guidance of professional doctors.