Number of patients | |||
---|---|---|---|
Stage | Preoperative | Latest Follow-up | |
I | Unilateral involvement | 24 | 17 |
II | Bilateral involvement without impairment of balance | 7 | 11 |
III | Mild to moderate bilateral disease; some postural instability; physically independent | 0 | 2 |
IV | Severe disability; still able to walk or stand unassisted | 0 | 1 |
V | Confined to wheelchair | 0 | 0 |