Pekka,
Ask your doc to send you to physical therapy and then ask your therapist about it. I have been given a lot harder exercises in physical therapy, after knee surgeries, than fin swimming. I would think fin swimming would be okay.
As far as kneecap injuries go, I think it’s one of the better knee injuries to have. If there is no ligament and cartridge damage, you should consider yourself lucky.
Good luck and don’t roller blade anymore with out complete safety gear. Injuries are just too detrimental to fitness.
don
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