# No pulmonary metastasis was observed in any patient.
* Patients without any prior treatment are 'primary', those with operative treatment following local reccurence are 'local reccurence', and those with operative treatment without local reccurence are 'no reccurence'.
** Duration between the operative treatment and the occurrence of the local recurrence (local recurrence group) or the measurement of TRACP 5b (no recurrence group). Y, year; M, month.
*** Measurement data are more than 1500 mU/dL.
## Pathological fracture occurred during curettage.