Table 5.

Results and pairwise comparison of width and length of the acromial resections required to correct the CSA to 35° for those models with CSA >35° (n = 13) 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	4.7 (2.2)	Lateral	–3.2	0.9	.041	–6.3 to –0.1
		Anterolateral	–2.8	0.6	.006	–4.8 to –0.7
		Posterolateral	–6.9	0.9	<.001	–9.9 to –3.9
		Image guided	–2.4	0.5	.009	–4.3 to –0.5
Length
Ideal	27.1 (10.6)	Lateral	–14.8	3.2	.005	–25.6 to –4.0
		Anterolateral	–10.6	3.0	.040	–20.8 to –0.4
		Posterolateral	–19.2	2.8	<.001	–28.7 to –9.6
		Image guided	-–10.3	3.0	.050	–20.6 to 0.0

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

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