Table 4 Postoperative imaging changes in different internal fixation groups.

From: Comparison between headless cannulated screws and partially threaded screws in femoral neck fracture treatment: a retrospective cohort study

Imaging data

PCS group (n = 34 (59.6%))

HCS group (n = 23 (40.4%))

P value

Screw position as inverted triangle (n (%))

20 (58.8%)

11 (47.8%)

0.413

Trajectory angle (degree, mean ± SD (range))

139.3 ± 7.7 (40)

142.8 ± 9.5 (37)

0.141

Change of neck-shaft angle (degree, mean ± SD (range))

6.0 ± 6.0 (27)

2.6 ± 4.0 (16)

0.023

Average screw back-sliding distance (mm, median (IQR))

2.7 (5.6)

1.2 (4.1)

0.042

Average screw migration distance (mm, median(IQR))

1.5 (3.2)

1.1 (4.6)

0.770

Femoral neck shortening (mm, median (IQR))

5.1 (7.6)

3.2 (5.2)

0.290

  1. SD and IQR stand for standard deviation and interquartile range respectively.
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