Post operation

Hi I'm new ,I'm 9 weeks post operation,I had hard time as was so bad completely locked knee cap , surgeon didn't think could do it ,but did after 4 hr op,but now I'm still all numb round knee cap,up outside of leg was numb but now gone but all tingly feeling,is this normal for anyone else,just finished physio this week,using a stick to walk now,and doing exercises regularly,any advice please.