A unit that has 50% casualties is usually no longer able to fight and must be replaced. But the Ukrainians leave their units on the frontline until nearly nobody is left in them.
It is no wonder that such high numbers can not be replaced.

The mix of dead or wounded will likely be 1 to 1 as medical evacuation from the frontline trenches is extremely difficult. Most wounded will just die there.

It is not only the men that are lost. The equipment they used is mostly lost with them. 24,000 men are the equivalent of 6 to 7 NATO brigades. The German army has now only 8 of those. When I was it that army it had 36 brigades plus significant reserve units. The same large downgrade happened with the general state of NATO. It is not ready for a war with Russia.

https://www.moonofalabama.org/2022/12/ukraine-sitrep-catastrophic-losses-failing-wonder-weapons-nato-escalation.html