What does heterogeneous marrow signal in the distal femur and proximal tibia mean?

Heterogeneous marrow signal in the distal femur and proximal tibia typically indicates a variation in the composition of the bone marrow, which can be due to several factors such as underlying pathology, inflammation, or prior trauma. This signal may suggest the presence of conditions like marrow edema, infection, or neoplastic processes. Further evaluation, often through additional imaging or clinical correlation, is usually required to determine the specific cause and significance of these findings.