The common causes of narrowing of the medial joint gap of the right knee include meniscus injury, degenerative lesions produced by long-term strain, and the reason for no redness and swelling is that the condition is temporarily mild, and the patient should keep resting, less strenuous activities to avoid other injuries, and go to a professional medical institution in time for consultation and treatment. Narrowing of the medial knee joint gap of the right leg should first look at whether there is any bone lesion, if there is no damage to the bone, there may be meniscus injury or cartilage wear and tear. The diagnosis needs to be further confirmed by MRI. Narrowing of the medial knee joint gap of the right leg can also be caused by degenerative osteoarthropathy, the main factors include: age, obesity, overuse of bone joints, long-term poor posture, and so on. After the right leg knee joint medial gap narrowing should be to rest and recuperate, avoid labor, cold, mechanical wear and tear and other triggers. You can apply diclofenac sodium cream locally, oral aminosugar drugs to soften the osteoarticular cartilage of the drug; can also be injected with sodium vitreous acid closure needle and other treatments. The above drugs should be used under the guidance of a doctor, avoid self-medication.