| Youngs | Middles | Olds | Total |
TUMOR | 1 | 3 | 7 | 11 (30%) |
TRAUMA | 2 | 1 | 0 | 3 (10%) |
INFECTION | 1 | 3 | 3 | 7 (20%) |
DEFORMITY | 3 | 2 | 1 | 6 (20%) |