He's supposed to touch the host and elevate the host and ciborium, but that's the NORMAL rule and concessions have always been made for circuмstances such as this. I wasn't referring to a concelebration but physical assistance. Priests are also supposed to genuflect and do other things, but priests who cannot were allowed to offer Mass sitting down, etc.
Thanks for the information. I didn't know if the pre-V2 Church made such exceptions, or if the Mass had to be celebrated strictly according to the rubrics. I thought I remembered one of the North American Martyrs getting a dispensation from Rome to celebrate Mass even though his fingers were mutilated by the natives, indicating to me, that in the absence of such a dispensation, he would have been considered physically irregular for celebrating Mass.
I know that nowadays, "anything goes" (except such things as questioning V2, whether the promulgation of the NOM was a good idea, or even whether the occupant of the papal chair at any given point is actually the Pope), and the Newchurch bends over backwards to accommodate every impediment that a priest could possibly have for the celebration of Mass, but I wasn't sure whether any such exceptions (aside from very minor, common-sense ones) were made "back in the day".