The hidden fracture of the right medial tibial plateau in seventy-something years old is most likely caused by osteoporosis, or it may be caused by large external force. 1. Osteoporosis: In most cases, occult fractures of the tibial plateau in the elderly are caused by damage to the dense structure of the bone, such as pathologic fractures combined with severe osteoporosis. It can be caused by mild external forces or high knee loads that result in subtalar plateau occult fractures. 2. Large external force: For the elderly in their seventies, there is degeneration in the bone condition, although there is no osteoporosis, generally large external force such as falling is the cause of occult fracture of the right tibia under the medial tibial plateau. For the seventy-somethings, when the right tibia medial subplatysmal occult fracture occurs, it is necessary to consult the hospital as soon as possible, after clarifying the condition, to receive the appropriate treatment, to avoid further aggravation of the fracture to affect the function.