In an arthritic fashion: in a way that is characteristic of a person with arthritis(adverb)
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Use "arthritically" in a sentence
"Taken on its own terms, Slow Love is a compelling and often funny addition to that burgeoning literary subset of autobiography: namely, women's memoirs about being knocked down in midlife and, painfully, arthritically, figuring out a way to get up again."
"Monday I woke with my knees throbbing — both arthritically and empathically — and, despite the sunshine streaming through my bedroom window, felt shrouded in gloom."
"Her arms moved arthritically, but she caught his massive head in her hands."