Osteoarthritis can be divided into two major categories based on the presence of local or systemic causative factors: primary osteoarthritis and secondary osteoarthritis. Primary osteoarthritis is mainly associated with factors such as age, obesity, occupation, and overuse. Secondary osteoarthritis can be seen in the following diseases: First, it is mechanical or anatomical abnormalities, such as abnormal joint development, acute and chronic joint injuries, etc. Second, it is severe joint diseases, such as septic arthritis, tuberculous arthritis, etc. Third, it involves metabolic abnormalities, such as gouty arthritis. Fourth, it involves endocrine abnormalities, such as acromegaly, hyperparathyroidism, etc., all of which can trigger osteoarthritic changes to some extent.