Table 3 Clinical results showing primary and secondary outcomes for the 21 participants. The ROM is the difference between post-operative ROM and the normal values [20, 21]

Postoperative ROM compared to normal values (in degrees)

Flexion (Mean ± SD)

-20 ± 19,0

-28,8 ± 21,2

0,28

Internal rotation (Median [IQR])

-15 [30]

-15 [20]

0,40

External rotation (Mean ± SD)

-14,3 ± 15,7

-5,4 ± 16,0

0,37

Abduction (Mean ± SD)

-6,7 ± 12,1

-4,2 ± 9,7

0,14

Radiographic improvement

Southwick angle (Mean ± SD)

-15,6 ± 14,2

-20,1 ± 21,5

0,31

Questionnaires

Physical PedsQL (Mean ± SD)^*

84,4 ± 16,5

74,3 ± 15,6

0,09

Psychosocial PedsQL (Median [IQR]) ^*

90 [3, 13]

91,7 [3, 28]

0,31

Total PedsQL

(Median [IQR]) ^*

89,1 [9, 23]

88,0 [4, 26]

0,21

HOOS-PS (Mean ± SD) ^*

11,3 ± 12,3

15,3 ± 14,3

0,27

Surgery time

Surgery time in minutes (Median [IQR])

156 [75]

147 [26]

0,25