Final answer:
The assessment finding that best supports the nursing diagnosis of pain in the right knee joint related to degenerative process is edema in the right knee.
Step-by-step explanation:
The assessment finding that best supports the nursing diagnosis of pain in the right knee joint related to degenerative process is option 3: Right knee appears edematous when compared to left knee. Edema, or swelling, is a common symptom of osteoarthritis (OA) in the knee joint. It occurs due to inflammation caused by the degenerative process. The presence of edema indicates ongoing joint inflammation and can contribute to pain and limited mobility.