Wiktionary
arthritically
adv. In an arthritic fashion: in a way that is characteristic of a person with arthritis
Usage examples of "arthritically".
Her feet had turned to huge, yellow-gray talons, arthritically gnarled by their own massiveness.
An elderly actor in a timeless suit places his fingers arthritically on the yellowed keys of a Bechstein piano and begins to play a distorted version of The Red Flag.
He came directly to Tungata and went down on his arthritically swollen knees before him, and he took one of Tungata's feet and placed it upon his silver pate.
He moved slowly, arthritically, as if things hurt a great deal, but by the time they'd helped him to the far doors, he was moving on his own power.