Which situation allows an umpire to use a cane but requires it to be padded?

In situations where an umpire requires assistance to walk, it is permissible for them to use a cane, provided that the cane is padded. The padding is necessary to ensure safety and to minimize the risk of injury to players and other officials during the game. This accommodation reflects an understanding of the potential mobility challenges the umpire may face while still maintaining their ability to perform their duties effectively.

The other circumstances listed do not require a padded cane because they address different physical conditions that may or may not impact the mobility of the umpire in the same way. For instance, an umpire with a prosthesis might not require additional assistance such as a cane, as they may already manage their mobility with the prosthetic device. Similarly, having one arm or an ankle cast doesn't inherently necessitate a padded cane for support. The padding specifically addresses the need for safety and prevention of accidents when walking assistance is required.