The Catterall classification of Perthes disease is based on radiographic appearances of the epiphysis and metaphysis visible in osteonecrosis of the femoral head:
bone absorption changes visible in the anterior aspect of the epiphysis of femoral head
changes are visible best in frog l...
The Enneking surgical staging system (also known as the MSTS system) is based on tumour grade, local spread and metastatic disease of malignant musculoskeletal tumours.
It does not classify skull tumours or marrow-originating tumours (e.g. lymphoma, plasmacytoma / multiple myeloma, Ewing sarcom...
Osteochondritis dissecans can be classified at surgery into 4 stages:
lesion in continuity with the host bone
covered by intact cartilage
stable on probing
partial discontinuity of the lesion from the host bone
unstable on probing
fragment not dislocat...
Staging of rhabdomyosarcoma is based on the Lawrence/Gehan Staging System which comprises of a combination of pretreatment staging and postoperative clinical grouping.
stage I: orbit, eyelid, head and neck (excluding parameningeal), genitourinary (non-bladder, non-prostate), N0 or 1, M0
The Salter-Thompson classification of Perthes disease simplifies the Catterall classification into two groups. Based on the radiographic crescent sign, we can distinguish:
group A: including Catteral groups I and II, where the crescent sign involves less than 50% of the femoral head
group B: i...
The Waldenström classification of Perthes disease refers to x-ray abnormalities, and represents four temporal phases of the disease. These stages have been further subdivided in the modified Elizabethtown classification 2.
stage I: early
asymmetric femoral epiphyseal size (smaller on the affec...