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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.