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| Group | N | Type | Samples | N% |
|---|---|---|---|---|
| Control | 10 | A | 4 | 40 |
| B | 5 | 50 | ||
| C | 1 | 10 | ||
| BSP | 10 | A | 0 | 0 |
| B | 3 | 30 | ||
| C | 7 | 70 |
A: Break or defect of femoral head surface; B: Only a change of bone cells, cartilage cells, and myeloid cells, no change of femoral head surface; C: Normal.
