Question: My 3yr old grandson fell and broke his knee over 10 weeks ago... Four weeks ago they took his cast off, well he was complaining his leg still hurt him and he couldn't run and he started limping alot.. So they did an mri and it showed an abnormality in his bone marrow.. what does this mean for him?What can we expect from his recovery?

Thank you.. here is what the report says from the MRI...please help me read this and understand it.......
Findings: The overall development of the knees are symmetric and normal.
Initial T1 sequences demonstrate patchy areas of decreased signal within the distal femoral epiphysis and proximal tibial epiphysis, which otherwise demonstrate appropriate fatty marrow conversion. There is corresponding increased signal on the long TR sequences in these same areas.
After the administration of contrast, there is a mild patchy enhancement corresponding with the areas of signal alteration within both the distal left femur and proximal left tibial. ( No abnormal enhancement within the diametaphyseal regions of the left leg or in the right knee region.)
There is a mild abnormal increased signal along the medial aspect of the proximal tibial metaphysis. The overlying cortex has uniform decreased signal. Mild edema in the proximal popliteus muscle near this region. No corresponding plain film abnormality in this region on today's images.
The slight heterogeneous signal within the diametaphysis of the distal femur and proximal tibia represent normal physiologic change due to incomplete red to yellow marrow conversion.
The cartilage of the distal left femur and proximal left tibia are normal and symmetric as compared to the right side.
While the sequences are optimized for bone marrow, there is no XXXXXXX internal derangement of the left knee.
No evidence of a joint effusion...

A four view left knee were obtained as outside images are not available. These demonstrate normal developmental anatomy. The slight irregularity of the femoral epiphysis is a normal developmental finding at this age. No evidence of periosteal change or other focal ossific abnormality in the medial tibial metaphysis where there is some mild medullary signal change on the MRI. Similarly, no focal abdomen on the is seen within the femoral epiphysis or tibial epiphysis in the areas of heterogeneous signal alteration on the MRI....

IMPRESSION:

Patchy altered signal within the distal femoral epiphysis and proximal tibial epiphysis, with corresponding mild patchy enhancement. The pattern is not nonspecific, but not typical of infection, metastatic deposits or malignant infiltration. Altered marrow signal is known to occur after disuse/immobilization due to altered mechanics and/or blood flow, although is better described in adult literature than pediatric literature. Given the nonspecific nature of the MR findings, however, clinical and plain film follow-up will be warranted to confirm that the mineralization and progressive development remain normal.
Mild focal bone marrow edema in the medial tibial metaphysis with mild edema in the adjacent origin of the medial tibial metaphysis with mild edema in the adjacent origin of the proximal portion of the popliteus muscle. It is possible this is residual edema from the primary injury, or subsequent mild trauma to this region....