Intraoperative measurement of acetabular component position using imageless navigation during revision total hip arthroplasty

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Fig. 1
Intraoperative photo of the navigation tool in use, demonstrating the positions of the mounted tracker (A), camera (B) and laptop workstation (C).
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Fig. 2
Bland–Altman plot showing the difference in cup inclination between navigation and CT measurements against the mean of the 2 measurements. CT = computed tomography; SD = standard deviation.
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Fig. 3
Bland–Altman plot showing the difference in cup anteversion between navigation and CT measurements against the mean of the 2 measurements. CT = computed tomography; SD = standard deviation.

Table 1

Surgical details

Element	No. (%) of patients n = 53
Right side	29 (54.7)
Approach
Lateral	36 (67.9)
Trochanteric slide	3 (5.7)
Extended trochanteric osteotomy	14 (26.4)
Component revised
Isolated acetabular	20 (37.7)
Isolated femoral	12 (22.6)
Head and liner exchange	15 (28.3)
All components	6 (11.3)
Indication for revision
Aseptic loosening	20 (37.7)
Instability	7 (13.2)
Poly wear	6 (11.3)
Periprosthetic fracture	4 (7.5)
Cup malposition	4 (7.5)
Trunnionosis	3 (5.7)
Trochanteric nonunion	2 (3.7)
Leg length discrepancy	2 (3.8)
Infection (first stage)	1 (1.9)
Psoas tendinitis	1 (1.9)
Painful hardware	1 (1.9)
Loose liner	1 (1.9)
Prior hip fusion	1 (1.9)