Finger contusion to determine whether the ligament is ruptured, can be based on the judgment of finger function, combined with the MRI scan to determine. 1. Judgement of finger function: you can make finger extension and flexion, abduction and adduction, etc. If the function is normal, then you can basically judge that the ligament is not ruptured. 2. MRI: MRI scan can also be used to accurately observe the damage of soft tissues. Generally, under MRI scan, the imaging of ligaments is very clear, and it can be clearly seen whether the ligaments are ruptured or not. If the patient has symptoms of ligament rupture, elective ligament suturing is recommended while maintaining blood supply and bone continuity. If contusion occurs in the finger, it is recommended to go to a regular hospital in time, and be judged by a specialist, to prevent errors due to self-judgment, which may lead to a misunderstanding of the condition.