That is normal with one type of TKR. The replacement hardware is specially made to compensate for that. It's called Cruciate sacrificing .He removed my acl and meniscus during surgery
When the cruciate ligaments are in poor condition or even ruptured, a prosthesis is used which has a peg on the plastic insert and a notch on the femoral component to take over their functions of keeping the joint stable.
It shouldn't affect your knee function at all, once your knee has recovered from the surgery.
New Zealand