How Long are Surgery Records Kept?

Quick summary - I had calf implant surgery in 2012 in Miami. A few days ago the implant dislocated. I no longer live near Miami and asked the Dr's office for any info on my surgery they could provide, to take with me to a consultation. They said they have absolutely no information, not even my name in a record, as they discard all records after 7 years. I find this so hard to believe. Is it normal? Thank you