) Patella, which was an injury to the cartilage in the
knee.
Surgery took care of it mostly and after about 8-9 months after
surgery I was almost as good as normal. Still have discomfort(on a small scale compared to before) from time to time, but nothing requiring even an ibuprofen to deal with. Hopefully, yours is as easily dealt with.
My well wishes and respect to those still serving in the sandbox and beyond. Coming,for what its worth, from a Med Retired USN..You all do Us proud.