Table 6.

Results and pairwise comparison of width and length of the acromial resections required to correct the CSA to 30° for those models with CSA >30° (n = 36) using the ideal resection and the resections based on the lateral acromial border

Technique	Resection Width (mm)	Comparative Technique	Mean Difference (mm)	SEM	P	95% Confidence Interval
Width
Ideal	5.5 (3.4)	Lateral	–2.5	0.4	<.001	–3.7 to –1.2
		Anterolateral	–1.9	0.3	<.001	–2.8 to –0.9
		Posterolateral	–7.4	0.7	<.001	–9.4 to –5.4
		Image guided	–1.6	0.3	<.001	–2.4 to –0.8
Length
Ideal	29.2 (11.2)	Lateral	–12.5	1.6	<.001	–17.2 to –7.8
		Anterolateral	–8.8	1.8	<.001	–14.1 to –3.6
		Posterolateral	–19.0	1.6	<.001	–23.7 to –14.3
		Image guided	–8.8	1.7	<.001	–13.9 to –3.8

Data for resection width and length are mean (standard deviation).

Abbreviation: CSA, critical shoulder angle; SEM, standard error of the mean.