"usually no signal alteration in the adjacent marrow"
"It typically affects young children (3-8 years of age). There is a recognised increased male predilection."
"Their exact pathogenesis is not well known. Several theories have been proposed. In some situations, it may follow an upper respiratory tract infection. Some have suggested a viral aetiology; potentially related to Parvovirus B19 and/or herpes simplex virus 6 infections. Others have proposed a post-traumatic aetiology with subsequent development of chemical synovitis."
"septic arthritis: on MRI there is often signal abnormality in marrow 8, and classically affects children "younger than 4 years and with a history of fever" while it is "older than 4 years of age and no history of fever" for transient synovitis 11; the Kocher criteria could also be used to aid in differentiating these diagnoses 14"
"For clinical limping, there is a much wider differential including other childhood arthritides (e.g. juvenile rheumatoid arthritis 1, Brucella arthritis), Perthes disease, epiphysiolysis, osteoid osteoma, etc."