Hey ask.me,

Yes you are right, complication rates vary a lot depending the center, age of patient, health condition, treatment undertaken etc.

But my intention was to find some estimates. Overestimation is better than underestimation so I thought it's reasonable to use the complication rates from other procedures and use that as a estimate for CLL.

Risk factors are useful, but only once you know you are going to get this done for sure. Then you can look into ways to minimise risks.

Is this the 1000 patient study you meant?
online.boneandjoint.org.uk/doi/full/10.1302/2046-3758.97.BJR-2019-0379.R1

That's a great study!

According to that, with Paley there is a 4% chance of fat embolism and 2% chance of deep vein thrombosis (not necessarily pulmonary embolism). Based on this we should try to find 1 in how many people end up with severe complications like disability and death due to these 2 complications.