Table 1.

Main features of patients enrolled (n=22).

	mean±sd	range
Age at first dislocation	19.8±4.7	14–29
Age at first surgery	23.8±5.8	15–36
Number initial dislocations	12.5±22.4	1–40
Years first dislocation-first surgery	4.6±4–5	0.1–17
Number disl between first & second surgery	3.2±5.4	0–25
Age second surgery	27.0±5.9	16–40
Years first surgery-second surgery	3.2±1.7	1–7