Bone Marrow Biopsy on Friday

Last Thursday I had an MRI done on my knee. Received results yesterday. Small MCL tear that requires surgery. Dr. said that because of "suspicious area" on my MRI above my knee (lower femur), he wants to do a biopsy of my bone marrow while he's scoping my knee. I've been searching the internet for information on bone marrow biopsies and I landed here. After reading some of the posts, I've become decidedly concerned. I also experience severe pain in my hip bone (which doctor thinks to be tendonitis), one finger has been intermittently painful for about 4 months, and I've had a lump in my underarm area for about 8 months (which I had checked by my Gynocologist). Of recent, I've started experiencing pain/pressure in my chest wall area (not sure if its related).

Like I said, after reading some of the posts, it seems as though my symptoms are concurrent with many of those on this site.

What can I expect from the BMB on Friday? I will be under anesthesia (for knee scoping).

THANKS!