My Mum had it done, & although it's supposed to have worked, she has always had problems in that leg since. Numbness that spread up her calf.
It's supposedly not to do with the implant, but the timing suggests it was & she has had it for 20 years & it led her to give up driving long-distance earlier than she would have because she felt unsafe with a "deadleg".
She has joint fusion in toe on the other leg & no problems.
This may well be coincidental, but she's convinced it's the implant & you did ask...