 A more rational approach currently used to minimize the costs of health care in a shorter period of time uses the strategy of firstly preventing the occurrence of secondary fracture, followed by primary prevention strategies. In this context, correct identification of fragility fractures and consequent treatment of those individuals is imperative. There are currently insufficient data about the epidemiology and evolution of other fragility fractures, also known as non-vertebral non-hip fracture NVNH. Among these, distal radius fracture and proximal humerus fractures are the most frequent. There is a type of fracture, however, that is simply ignored by the medical community: the knee insufficiency fracture.A possible explanation for this information gap could be the fact that, until a few years ago, this entity was believed to be a osteonecrosis of the knee. Only recently it is becoming clear that the cause of pain and marrow bone edema that occur subtly in older individuals is, in fact, a insufficiency fracture. The perception that this lesion is actually a fracture is relatively new. The knee insufficiency fracture usually occurs in older individuals and those with knee osteoarthritis. This study therefore aims to evaluate whether there is a relation between knee insufficiency fracture and osteoporosis. Moreover, it is expected to find out if this fracture may be defined as a fragility fracture, electing the individuals affected by it to a prophylaxis for the occurrence of new osteoporotic fracture. 