1. Disease and surgical factors: The increase in osteoarthritis cases is a significant driving force. Approximately 7% of the global population is affected by osteoarthritis, with over 32.5 million people in the United States suffering from it. The demand for knee braces is high for postoperative rehabilitation after knee replacement surgery, and the usage rate of knee braces after such surgery is over 90%. 

2. Factors of sports injuries: The increase in sports-related injuries has also driven market demand. According to data from Johns Hopkins University, there are approximately 3.5 million sports-related injuries in the United States each year. Knee braces can prevent improper movements during sports and aid in recovery. 

3. Demographic factors: The global aging population has led to an increase in the demand for knee braces, as the elderly are more prone to musculoskeletal problems. 

4. Technological progress factor: Technological advancement drives the development of the industry. The rise of smart knee braces, which can monitor joint movement in real time through built-in sensors, provides personalized rehabilitation plans for patients and also helps doctors optimize treatment plans.