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Natural progression of SARS patients from ONFH onset to the pericollapse stage
| Stage | Type M | Type C | Type L1 | Type L2 | Type L3 |
|---|---|---|---|---|---|
| Pericollapse/total patients | 0/13 | 6/45 | 20/89 | 9/9 | 31/36 |
| Percentage | 0.0 | 13.3 | 22.5 | 100.0 | 86.1 |
| Time needed, n | |||||
| <1 year | / | / | / | 2 | 5 |
| <2 years | / | / | 1 | 2 | 13 |
| <3 years | / | / | 4 | 5 | 13 |
| <4 years | / | 2 | 4 | / | / |
| <5 years | / | 2 | 11 | / | / |
| <6 years | / | 1 | / | / | / |
| <7 years | / | 1 | / | / | / |
| Mean | / | 5.2 | 4.3 | 2.3 | 2.3 |
SARS: Severe acute respiratory syndrome; ONFH: Osteonecrosis of the femoral head.
