Whether the cast can be removed in 20 days mainly depends on the patient’s condition. For patients with mild fracture or tendon tear and good recovery, the cast can be removed in 20 days; for patients with severe fracture or complete tendon rupture, especially those with slow recovery, the cast cannot be removed in 20 days. 1. For stable fracture, no obvious displacement, or tendon partially torn patients, can be given cast external immobilization, in the cast after 20 days if the review of X-ray film recovery is good, it is possible to remove the cast. 2. For serious fractures, especially unstable fractures, the cast cannot be removed after 20 days of immobilization, and it takes 4~6 weeks to remove the cast. For patients with tendon rupture, it also takes 4~6 weeks to remove the cast after anastomosis, and premature removal of the cast is prone to secondary injury. Before removing the cast, it is recommended that the patient go to the hospital for a follow-up examination to clarify the recovery situation, and the professional physician will decide whether the cast can be removed in 20 days according to the condition of the patient.