There are many reasons why the knee doesn’t hurt when going up the stairs or down the stairs, mainly due to meniscus injury, chondromalacia patella, rheumatism or rheumatoid arthritis.
1. Meniscus injury: when the patient’s knee meniscus injury occurs, the external stimulus received when going up the stairs is small, and thus will not produce pain, in the downstairs will be because of the knee joint to withstand the increase in force and produce localized pain phenomenon.
2. Chondromalacia patella: patients with inflammation of the patellar cartilage, when going down the stairs, due to the greater angle of knee flexion, the pressure on the patellar cartilage will increase, resulting in pain.
3. Rheumatism or rheumatoid arthritis: when rheumatism accumulates in the knee joint, it will produce localized pain, which will be aggravated after the knee joint is stressed.
The cause of knee pain upstairs and downstairs may also have other reasons, such as knee tuberculosis, knee synovitis, trauma resulting in fractures and bone tumors, etc., it is recommended to consult a doctor in a timely manner, improve the relevant examination, clear the cause of the disease after targeted treatment and therapy.