Hi since the urethra is very sensitve some injury may have occured but i want to confirm that your psa is 67? As with the usual numbers, any psa like 5 would recommend a biopsy. What age are you and do you have a family history of prostate issues. What did the doc say about the 67?
If its point 67 (,67) not 67 then your psa is very good as any number below 1 is perfect.
The back pain would not be a cancer concern but a psa of 67 i would suggest a biopsy since it runs in your family. Have it done in a hospital where they can put you out and do a good search, not in the doctors office.