The most noticeable symptom of knee osteoarthritis is the pain. This can make it hard for any patient to carry out mobile tasks, like walking, running, or kneeling. The knees can even feel stiff or swollen just by standing still, and can even slightly change shape overtime if left untreated. At any moment, they might feel wobbly, make a cracking sound, or sometimes appear puffy. Although older adults are likely to develop knee osteoarthritis, other conditions such as genetics or injury can manifest this condition much earlier.