What are the common diseases of the joints?

Common joint diseases mainly include the following: 1. **Arthritis**: Such as degenerative arthritis, osteoarthritis, rheumatic arthritis, rheumatoid arthritis, and gouty arthritis. These conditions are usually caused by various factors, including age, obesity, infection, genetic predisposition, and autoimmune abnormalities. 2. **Fractures**: Common joint injuries caused by trauma, including closed fractures and open fractures. 3. **Periarthritis of the shoulder**: A chronic inflammation of the soft tissues around the shoulder caused by friction, compression, and other factors. 4. **Osteoporosis**: A metabolic bone disease commonly seen in the elderly, caused by reduced bone formation, increased bone resorption, or malnutrition. These diseases may cause symptoms such as joint swelling, pain, stiffness, dysfunction, and effusion, and timely medical consultation is required for diagnosis and treatment.