Pope Francis presided over the Solemnity of the Lord, celebrated annually in the Sistine Chapel. Since last year and after the issuing of TC turning the clock back (backwardism)) to the time before Summorum Pontificum and Ecclesia Dei, the Mass is now celebrated on a faux altar placed in front of the historic altar of the Sistine Chapel. no central crucifix on the faux altar facing the celebrant.
Cardinal Krejeski was the celebrant of the Liturgy of the Eucharist. He has gained a lot, I mean, a lot of weight and he as trouble walking and needed assistance coming down the steps from the altar. I guess he has knee issues which I can certainly empathize.
Here are some screen shots following the Mass: