Table 2.

Intra- and interobserver (2 observers) correlation of all parameters

Parameter		Intraobserver reliability			Interobserver reliability
		ICC		95% CI	ICC	95% CI
Preoperative radiograph
LCAE	0.985		0.978–0.991		0.960	0.937–0.97
AI	0.989		0.983–0.993		0.968	0.924–0.983
AWI	0.970		0.954–0.981		0.819	0.721–0.882
PWI	0.986		0.979–0.991		0.946	0.917–0.965
Intraoperative fluoroscopic imaging
LCAE	0.969		0.952–0.980		0.871	0.784–0.921
AI	0.976		0.963–0.984		0.881	0.708–0.941
AWI	0.953		0.927–0.970		0.798	0.689–0.869
PWI	0.974		0.958–0.983		0.910	0.861–0.942
Postoperative radiograph
LCAE	0.978		0.965–0.985		0.889	0.829–0.928
AI	0.983		0.974–0.989		0.921	0.877–0.949
AWI	0.975		0.962–0.984		0.829	0.737–0.889
PWI	0.975		0.961–0.984		0.856	0.775–0.907

The wall indices (AWI and PWI) showed a slightly but noticeably lower values for ICC in the intraoperative reading. However, intra- and interobserver correlation of all parameters was excellent