Which feature is commonly reported in the history of knee OA?

Which feature is commonly reported in the history of knee OA?

• A. Morning stiffness <30 minutes
• B. Morning stiffness >60 minutes
• C. Fever and systemic malaise
• D. Pain that awakens at night

Answer: (A)

In knee osteoarthritis, the history commonly shows morning stiffness that lasts less than 30 minutes. This short duration reflects the mechanical nature of OA—stiffness from cartilage and joint surface changes that improves quickly with movement after you start using the joint. The pain in OA tends to be worse with activity and weight-bearing and eases with rest, which aligns with a non-inflammatory, degenerative process. Stiffness lasting more than an hour is more typical of inflammatory arthritis (like rheumatoid arthritis), which involves systemic inflammatory activity. Fever and systemic malaise are signs of a systemic or infectious process, not typical of OA. Pain that wakes you at night can occur with OA but is not the defining feature; OA pain is usually activity-related and may disturb sleep only if the disease is advanced or if there are other sleep-disrupting factors. So the best historical clue for knee OA is brief morning stiffness that resolves with movement within minutes.

In knee osteoarthritis, the history commonly shows morning stiffness that lasts less than 30 minutes. This short duration reflects the mechanical nature of OA—stiffness from cartilage and joint surface changes that improves quickly with movement after you start using the joint. The pain in OA tends to be worse with activity and weight-bearing and eases with rest, which aligns with a non-inflammatory, degenerative process.

Stiffness lasting more than an hour is more typical of inflammatory arthritis (like rheumatoid arthritis), which involves systemic inflammatory activity. Fever and systemic malaise are signs of a systemic or infectious process, not typical of OA. Pain that wakes you at night can occur with OA but is not the defining feature; OA pain is usually activity-related and may disturb sleep only if the disease is advanced or if there are other sleep-disrupting factors.

So the best historical clue for knee OA is brief morning stiffness that resolves with movement within minutes.