Table 2.

Head-shaft angle loss and postoperative shoulder function

Characteristics	MCS (n = 75)	MMSS (n = 26)	MSSS (n = 29)	NMS (n = 51)	Statistics	P
Postoperative NSA (°)	133.46 ± 6.01	132.39 ± 7.77	135.17 ± 10.15	132.41 ± 7.16	1.02*	0.387
NSA at final follow-up (°)	132.79 ± 6.02§	130.19 ± 9.25	131.28 ± 12.85	127.35 ± 8.50	4.40*	0.008
NSA loss (°)	0.0 (0.0–1.0)||	1.3 (0.0–3.1)¶	1.5 (1.0–5.2)	4.0 (1.2–7.1)	60.66†	<0.001
NSA loss ≥5°	0 (0)||	3 (11.54)¶	8 (27.59)	20 (39.22)	35.84‡	<0.001
CM	81.35 ± 9.79**	78.04 ± 8.97††	72.76 ± 10.98	67.33 ± 12.31	18.68*	<0.001
Excellent and good rate of CM	65 (86.67)**	21 (80.77)¶	19 (65.52)	22 (43.14)	29.25‡	<0.001
VAS value	1 (0–2)**	1 (0–2)††	2 (1–3)	3 (1–5)	27.80†	<0.001

Data are presented as mean ± SD, median (IQR) or n (%). *F values; ^†H values; ^‡χ² values; ^§Significant differences were found between MCS and NMS groups; ^||Significant differences were found between MCS and the other three groups; ^¶Significant differences were found between MMSS and NMS groups; **Significant differences were found between MCS and MSSS, NMS groups; ^††Significant differences were found between MMSS and MSSS, NMS groups. MCS: Medial cortical support group; MMSS: Medial multiscrew support group; MSSS: Medial single screw support group; NMS: No medial support; NSA: Neck-shaft angle; CM: Constant-Murley score; VAS: Visual Analogue Scale; SD: Standard deviation; IQR: Interquartile range