Rohan had been playing for his club for fifteen years when his elbow got injured.
Someone suggested to me that the italicized part of above sentence is wrong, the reason being the subject of got verb in above sentence - his elbow is wrong either the subject should be he i.e. he got his elbow injured or his elbow should be used in passive form i.e. his elbow was injured. I don't understand why the subject his elbow is wrong?