Four cases of radiographically occult fracture of the proximal tibia were studied. Two of the 4 had of were bone bruise, and the remaining 2 had tibial plateau fracture and intercondylar eminence fracture. An area of signal intensity loss on T 1-weighted MR images was present in all cases. Reticulated or inhomogeneous signal intensity loss was especially the characteristic feature of bone bruise. All cases showed almost complete resolution of the findings in follow-up examination approximately 3 months later.
