15，Veenland J F, Grashuis J L. Estimation of fractal dimension in radiographs. M ed.Phys, 1996,23(4):585～594.
21，Shen Y， Shi F W,Chen Y et al.Relat ionship between microvasular structure and biological characteristics of giant c ell tumor of bone. China Med. J,1994,107(5):368～370.
33，Serra J. Image analysis and mathematical morphology. New York:Academic Press. , 1982:146～152.
44，Samarabaudu J, Acharya R et al. Analysis of bone X-rays using morphologi cal fractals. IEEE Trans. on Med. Imag, 1993,12(3):466～470.
5[1]Goldenberg RR,Campbell CJ,Bonfiglio M.Giant-cell tumor of bone,an analysis of two hundred and erghteen cases[J].J Bone and Joint Surg(Am ),1970,52:619～664.
6[2]Campanacci M,Baldini N,Boriani S,et al.Giant cell tumor of bone[J].J Bone and Joint Surg(Am),1987,69:106～114.
7[3]Lausten GS,Sensen PK,Schiodt T,et al.Local recurrences in giant cell tumor of bone:Long term follow up of 31 cases DNK-lnt[J].Orthop,199 6,20(3):172～176.
8[4]Eckardt JJ,Grogan TJ.Giant cell tumor of bone[J].Clin Or thop,1986,204:45～58.
9[5]Dahlin DC,Cupps RE,Johnson EW.Jr.Gicant cell tumor:A study of 195 cuses[J].Cancer,1970,25:1 061～1 070.
10[6]Present D,Bertoni F,Hudson T,et al.The correlation between the radiologic staging studies and histopathologic finding in aggressive stage-3 giant cell tumor of bone[J].Cancer.1986,57(2):237～244.
8Enneking WF. A system of staging musculoskeletal neoplasms. Clin Orthop Relat Res, 1986, (204) :9-24.
9Boriani S, Weinstein JN, Biagini R. Primary bone tumors of the spine. Terminology and surgical staging. Spine, 1997, 22 : 1036- 1044.
10Ishii K, Chiba K, Watanabe M, et al. Local recurrence after S2- 3 sacrectomy in sacral chordoma. Report of four cases. J Neurosurg.2002.97(1 Suppl) : 98-101.
