How many millimeters does stress photography widen the knee joint?

When X-ray film of knee joint stress is taken, it can be clearly seen that the medial space of knee joint is widened, which is the manifestation of medial collateral ligament injury. After these symptoms appear, patients should go to the hospital in time, and after being diagnosed by doctors, they should be given symptomatic treatment according to the degree of medial collateral ligament injury.