Table 2.

Perioperative data of patients. Values are median (range) unless otherwise specified

	Medial open reduction (n = 28)	Arthroscopic reduction (n = 26)	All patients (n = 54)
Preoperative data
Tönnis classification, n
Grade I	0	0	0
Grade II	10	10	20
Grade III	14	13	27
Grade IV	4	3	7
Acetabular index angle (°)	40 (24–49)	38 (28–44)	39 (24–49)
Operative data
Operative time (minutes)	34 (30–40)	32 (30–40)	32 (30–40)
Estimated blood loss (mL)	35 (15–55)	9 (5–15)	18 (5–55)
Postoperative data
Acetabular index angle (°)	26 (11–39)	27 (19–36)	26 (11–39)
Coverage ratio of femoral head (%)	80 (0–100)	80 (50–100)	80 (0–100)