Radius fracture thumb can not be cocked can be caused by injury stimulation, nerve damage, tissue adhesion and other reasons. 1. Injury stimulation: After radius fracture, it can lead to hemorrhage of the fracture end and its surrounding soft tissues, causing local pain, swelling and other uncomfortable symptoms, pain and hemorrhage can stimulate the thumb, resulting in thumb inability to cock and other impaired performance. 2. Nerve injury: radial fracture can lead to radial nerve injury, or fracture fracture compression of the radial nerve, resulting in reduced nerve conduction, which can be manifested in the loss of innervation of the local muscles of the thumb, and the inability to cock the thumb. 3. Tissue adhesion: after radius fracture and other injuries, due to the poor alignment of the fracture end and tendon and other soft tissue injury adhesion, local scar tissue proliferation is serious, which can affect the thumb and other fingers can not be upward finger and other functional activities are limited performance. When the thumb cannot be tilted up after radius fracture, it is necessary to consult a doctor in time, and to actively carry out appropriate treatment under the guidance of a specialized doctor, which can help to improve the function of the thumb as soon as possible.