No immediate surgery required Focus on Physiotherapy.Do exercises such as Quadriceps strengthening (static quads, straight leg raise),VMO strengthening,Hamstring stretching Stationary cycling (low resistance)

No further surgery Need medicine and mild physiotherapy Rest to knee High protein diet

Based on the MRI, your father has Grade-3 chondromalacia patella (cartilage wear behind the kneecap) along with mild joint fluid and post-meniscus surgery changes, which are likely causing his current pain. This type of degeneration commonly leads to discomfort while walking, climbing stairs, or standing for long periods. In most cases, another surgery is not immediately required, and treatment focuses on simple measures like activity modification, home knee-strengthening exercises, weight control, and pain/anti-inflammatory medicines. Injections such as hyaluronic acid or PRP may also provide temporary relief from swelling and pain. Surgery is only considered if symptoms remain severe or function does not improve over time.