Not all knee cysts require surgical treatment, depending on the specific characteristics and severity of the knee cyst. Common knee cysts include popliteal cysts, cruciate ligament cysts and even meniscal cysts. If the above mentioned cysts are large in size, such as cysts in the popliteal fossa with symptoms of compression of nerves and blood vessels, or meniscal cysts with meniscal rupture due to external injury, or cruciate ligament cysts with ligament rupture due to external injury, these cases must be treated surgically, and conservative treatment has no good effect. The significance of surgical treatment should be determined after the specific characteristics of the cyst are clarified and then combined with the present clinical symptoms.