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Clinical characteristics of four consecutive patients with spontaneous osteonecrosis of the knee
| Case number | Sex, age (years) | Affected side | Duration between onset of pain and surgery (months) |
|---|---|---|---|
| 1 | F, 74 | R | 2 |
| 2 | F, 68 | R | 2 |
| 3 | F, 72 | L | 3 |
| 4 | M, 54 | L | 4 |
The case numbers were assigned in ascending order of the time between the onset of pain and surgery.
