Percutaneous medial hemi-epiphysiodesis using a transphyseal screw for caput valgum associated with developmental dysplasia of the hip

Table 2 Preoperative and postoperative data of the operated hips

N = 18	Preoperative status^a	Latest follow-up^a	P value†
Proximal femur
Hilgenreiner-epiphyseal angle (°)	5.1 ± 11.3	20.6 ± 11.3	0.001
Head-shaft angle (°)	169.5 ± 10.5	150.0 ± 10.0	<0.001
Neck-shaft angle (°)	143.0 ± 7.9	132.1 ± 6.0	<0.001
Femoral neck
Articulo-trochanteric distance (mm)	21.1 ± 7.9	13.6 ± 8.1	0.001
Femoral neck length ratio^b	0.929 ± 0.173	0.787 ± 0.281	0.056
Acetabular morphology & subluxation^c
Sharp angle (°)	46.7 ± 4.8	44.9 ± 5.5	0.030
Acetabular roof angle (°)	17.1 ± 7.4	16.3 ± 8.0	0.408
LCEA (°)	23.3 ± 6.1	23.9 ± 8.0	0.717
Medial joint space width ratio^b	1.408 ± 0.518	1.396 ± 0.489	0.507
CHDD^b (%)	9.2 ± 5.5	6.2 ± 5.1	0.003

†Wilcoxon signed rank test
^aThe values are given as the mean and the standard deviation
^bUnilateral cases only (N = 14)
^cTwo hips which underwent pelvic osteotomy concurrent with hemi-epiphysiodesis were excluded

ISSN: 1471-2474