A walk in the park

OK, I've had a gutful of this - I eat my greens, don't smoke and hit 44 still with a 32" waist!
Unless a (usually) moderate winter weekend intake of Bailey's, Guinness and/or middle-shelf cool climate reds is great cause for tumours - I really shouldn't have a greater than average chance of suspicious cell clusters arising!
A tangent in the b grade medical drama: bone tumour out of lower right femur, probably primary, no other tumours identified so far. Just big hard lump on inside of knee.
First suspected something wrong Jan/Feb when a binge gardening incident caused big pain in the knee for a few days, then no big deal but seemed a lump had arisen. I figured a hamam-style wrestle by an osteopath would pop it back into place and all would be well. Didn't work. But NZ South Island Lewis Pass hiking in March wasn't an issue.
Seemed bigger and started hurting the whole area April/May - X-Rays and Ultrasounds revealed 'suspicious tumour' a few weeks back.
Now awaiting biopsy results in a Northcote cafe, and a segue back to the original story becomes apparent: NQR knees hold nothing like the anxiety of NQR brains.
If malignant, what are the consequences of cancerous bone tumour cells invading nearby healthy tissue?: it's not like I'll be left in a vacuous stare not knowing my own name or what day it is. Perhaps a hobble, setting off airport x-rays with bionic bits and choosing less ambitious hike routes.
I mean, what really could go wrong with surgery? (likely regardless of whether benign or malignant). Nothing AFL footballers don't deal with several few times before they're 30.
We've been destroying knees in an impressive and spectacular manner since WW1, and the comparatively rudimentary science of putting them back together has had big resourcing since football stars became multi-million dollar commodities in the 80s.
Sure the possibility of cancer of any description is a scary beast: but compared to the spectre of brain beasties, the knee tumour is a walk in the park.