Table 1.
Patient characteristics
| Patient characteristic | Number | Percentage |
|---|---|---|
| Sex | ||
| Male | 228 | 59 |
| Female | 161 | 41 |
| Age (years) | ||
| < 16 | 218 | 56 |
| ≥ 16 | 171 | 44 |
| Tumor location | ||
| Femur | 196 | 50 |
| Tibia | 99 | 25 |
| Humerus | 51 | 13 |
| Fibula | 23 | 6 |
| Pelvis | 12 | 3 |
| Radius | 3 | < 1 |
| Ulna | 2 | < 1 |
| Calcaneum | 1 | < 1 |
| Scapula | 1 | < 1 |
| Talus | 1 | < 1 |
| Type of operation | ||
| Endoprosthetic reconstruction | 276 | 71.0 |
| Amputation | 89 | 23 |
| Allograft | 11 | 3 |
| Excision | 11 | 3 |
| Rotationplasty | 2 | < 1 |
| Fletcher’s subclassification of osteosarcoma | ||
| Osteoblastic | 199 | 51 |
| Chondroblastic | 34 | 9 |
| Telangiectatic | 26 | 7 |
| Fibroblastic | 19 | 5 |
| Giant cell | 4 | 1 |
| Small cell | 3 | < 1 |
| Mixed | 46 | 12 |
| Unclassified | 58 | 15 |
| Intra-/extracompartmental | ||
| Intracompartmental (IIa) | 119 | 31 |
| Extracompartmental (IIb) | 267 | 69 |
| Pathological fracture | ||
| Yes | 60 | 15 |
| No | 329 | 85 |
| Skip lesions | ||
| Yes | 8 | 2 |
| No | 381 | 98 |
| Vascular invasion | ||
| Yes | 44 | 11 |
| No | 345 | 89 |
| Chemotherapy necrosis | ||
| ≥ 90% | 162 | 42 |
| < 90% | 227 | 58 |
| Musculoskeletal Tumor Society stage | ||
| Intralesional | 26 | 7 |
| Marginal | 175 | 45 |
| Wide | 144 | 37 |
| Radical | 44 | 11 |
| Local recurrence | ||
| Yes | 47 | 12 |
| No | 352 | 88 |
| Total | 389 | |