From a reader:
A priest I know has temporarily lost the use of his left arm because of surgery and has been saying Mass using his right arm only. He keeps his left arm under the chasuble, and someone else helps him distribute communion. I know a priest has to have both hands to be ordained, so is the Mass still valid (or licit) if he’s only using one?
Hopefully Father will make a full and swift recovery.
Validity of Mass, or any other sacrament, does not depend on the number of limbs the priest can use. Furthermore, I don’t believe that there is still a requirement that a man have both hands or his thumb and index fingers to be ordained. That was the case in the past, however.
So, Mass is still both valid and licit in this case.
I wouldn’t give this a second thought.