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Table 1 Comparison of slip-retention group and slip-progression group

From: Lateral insertion is a good prognostic factor after in situ fixation in slipped capital femoral epiphysis

 

Retention group (39 hips)

Progression group (14 hips)

p value

Age (years)

11.9

11.6

0.420*

BMI

24.2

26.1

0.118*

PTA at ISF (degrees)

33.7

32.6

0.944*

PTA at physeal closure (degrees)

34.6

39.5

0.077*

Progression of PTA (degrees)

0.9

6.9

0.001*

SCFE type (acute: acute on chronic: chronic)

9:12:18

3:0:11

0.043¶

Stability (stable: unstable)

35:4

13:1

1.000§

Screw position (1:2:3)†

22:14:3

7:5:2

0.759¶

Distribution of threads (1:2)‡

17:22

3:11

0.203§

Point of insertion (lateral:medial)

25:14

3:11

0.011§

Time for full-weight bearing (weeks)

4.8

3.4

0.165*

Time for physeal closure (months)

12.1

15.4

0.088*

  1. Slip-retention group means five degrees or less of PTA increase and slip-progression group means more than five degrees. †1 point, the central axis of the screw is located over the center line of the femoral head or within a distance equal to one-half the diameter of the screw; 2 points, the distance between the axis of the screw and center line of the femoral head is between one-half and one screw-diameter; and 3 points, the axis of the screw is located more than one screw-diameter from the center line of the femoral head. ‡1 point, 40-60% of the threads engage the physis; 2 points, < 40% or > 60% of the threads engage the physis. *Mann-Whitney’s U test, ¶Pearson’s χ2 test, §Fisher’s exact probability test.