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

Table 2 Comparison of lateral insertion group and medial insertion group

	Lateral group (28 hips)	Medial group (25 hips)	p value
Age (years)	12.0	11.7	0.274*
BMI	23.9	25.6	0.113*
PTA at ISF (degrees)	29.6	37.7	0.004*
PTA at physeal closure (degrees)	30.8	41.6	0.001*
Progression of PTA (degrees)	1.2	3.9	0.001*
Ouctome (slip retention: slip progression)	25:3	14:11	0.011§
SCFE type (acute: acute on chronic: chronic)	8:9:11	4:3:18	0.053¶
Stability (stable: unstable)	25:3	23:2	1.000§
Screw position (1:2:3)†	19:6:3	10:13:2	0.067¶
Distribution of threads (1:2)‡	12:16	8:17	0.571§
Time for full-weight bearing (weeks)	4.0	4.9	0.378*
Time for physeal closure (months)	13.5	12.4	0.513*

†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.

ISSN: 1471-2474