I have been diagnosed with stage 2 knee osteoarthritis. Can I cycle regularly, and what precautions should I take? (Minh Tuan, Ninh Binh province)

After 5 years in a wheelchair, 61-year-old Ms. Thanh received an artificial knee replacement and can now walk normally.

Ms. Hong, 50 years old, has suffered from knee osteoarthritis on a background of rheumatoid polyarthritis for 13 years, with the condition worsening and severely affecting her mobility.