Clinical Validation of Computer-Assisted Navigation in Total Hip Arthroplasty

Table 1

Acetabular cup inclination (inc) and anteversion (ant) using postoperative CT-scan and AP radiograph images from 9 patients after THA.

Cup orientation values—Patient no.	Planned (pre-op) cup orientation (inc/ant)	Per-op cup orientation (Navitrack system readings) (inc/ant)	Postop CT-scan (inc/ant)	Δ between postop CT-scan and per-op reading (inc/ant)	Postop AP radiograph reading (inc/ant)	Δ between AP radiograph and postop CT-scan (inc/ant)
Patient 1	46/20	44/29	43/27	−1/−2	45/23	2/−4
Patient 2	46/20	45/22	47/21	2/−1	47/24	0/3
Patient 3	45/20	42/26	42/24	0/−2	46/28	4/4
Patient 4	50/25	52/24	50/22	−2/−2	52/24	2/2
Patient 5	49/25	50/23	47/20	−3/−3	50/23	3/3
Patient 6	45/21	43/25	41/23	−2/−2	43/23	2/0
Patient 7	48/22	46/30	43/30	−3/0	43/27	0/−3
Patient 8	51/23	60/25	56/25	−4/0	53/18	−3/−7
Patient 9	47/22	46/22	39/24	−7/2	37/20	−2/−4
Inclination Anteversion	𝟒𝟕±𝟐^∘	𝟒𝟕±𝟔^∘	𝟒𝟓±𝟓^∘	𝟐.𝟕±𝟐^∘	𝟒𝟔±𝟓^∘	𝟐.𝟎±𝟏.𝟑^∘
	𝟐𝟐±𝟐^∘	𝟐𝟓±𝟑^∘	𝟐𝟒±𝟑^∘	𝟏.𝟔±𝟏^∘	𝟐𝟑±𝟑^∘	𝟑.𝟑±𝟏.𝟗^∘
(Average ± SD)