I have been able to recognize a new pathogenesis of arthrosis. According to this pathogenesis, I have developed a new treatment to drain the joint fluid from the lesional bone marrow. This new treatment is referred to as “Core Drainage.” The benefits of my “Core Drainage” method were effective for late stage arthrosis and resulted in almost immediate pain relief. This is a minimally invasive procedure that does not require bed rest post-operatively. Patients are able to bear weight immediately. Core Drainage can prevent progression of arthrosis and can even cure arthrosis at an early stage. With this technique, degenerated and worn joint cartilage was regenerated, and joint effusion and contracture were almost eliminated. The Core Drainage method greatly enhances the patient’s quality of life.