Orthopaedic perspective on bone metastasis

Table 2 Capanna classification, classification according to tumour type

Classification according to tumour type
Class 1	Solitary metastatic lesion
	Primary with good prognosis
	Interval after primary over 3 years
Class 2	Pathological fracture at any site
Class 3	Impending fracture in a major weight bearing bone
Class 4	Osteoblastic lesions at all sites
	Osteolytic or mixed lesions in non-structural bones
	Osteolytic lesion with no impending fracture in major weight-bearing bone
	Lesions of the iliac wing, anterior pelvis or scapula