Why has my finger become stiff after an injury?

Hello,

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You have mentioned that you got an injury to your finger previously and now, you are having some issue with its movements. As per your symptoms, it could be subluxating out of the jointand then coming back as per the movements. For that, I will advise you to kindly get in touch with a hand surgeon. May be an MRI scan will be required to assess the quantum of your hand injury and treatment can be initiated accordingly. Another thing which comes to my mind is a trigger finger when the flexor tendons get entrapped in the thickened tenosynovium and there is a popping sound when the affected finger is moved every time. In any case, logical thing will be to consult a doctor, preferably an orthopedic surgeon to get a detailed examination of the concerned finger and initiating treatment accordingly. I suggest you a fresh x-ray and if required an MRI scan of the affected hand so that the treatment can be started accordingly.