An accelerometer-based navigation system provides acetabular cup orientation accuracy comparable to that of computed tomography-based navigation during total hip arthroplasty in the supine position

• Published in: Journal of orthopaedic surgery and research Vol. 15; no. 1; p. 147
• Main Authors: Tetsunaga, Tomonori, Yamada, Kazuki, Tetsunaga, Tomoko, Sanki, Tomoaki, Kawamura, Yoshi, Ozaki, Toshifumi
• Format: Journal Article
• Language: English
• Published: England BioMed Central Ltd 15.04.2020; BioMed Central; BMC
• Subjects: Accelerometers; Accelerometry - methods; Accuracy; Acetabulum; Acetabulum - diagnostic imaging; Acetabulum - physiology; Acetabulum - surgery; Aged; Aged, 80 and over; Arthritis; Arthroplasty, Replacement, Hip - methods; CAT scans; Computed tomography; Female; Hip; Hip replacement arthroplasty; Humans; Imaging, Three-Dimensional - methods; Joint replacement surgery; Joint surgery; Male; Medical research; Middle Aged; Navigation system; Navigation systems; Neuronavigation - methods; Orthopedics; Pelvis; Polyethylene; Registration; Retrospective Studies; Retrospective study; Standard deviation; Statistical analysis; Supine Position - physiology; Surgeons; Surgery, Computer-Assisted - methods; Tomography, X-Ray Computed - methods; Total hip arthroplasty; Total hip replacement; Transplants & implants; United States > US; Japan; Navigation system; Retrospective study; Total hip replacement; Hip
• ISSN: 1749-799X; 1749-799X
• DOI: 10.1186/s13018-020-01673-y

Inadequate acetabular component orientation is associated with postoperative impingement, dislocation, and accelerated polyethylene wear. Computed tomography (CT)-based navigation systems provide accuracy for total hip arthroplasty (THA) but are not available in all facilities. Accelerometer-based navigation systems are inexpensive, but their accuracy remains undetermined. This study compares the accuracy of cup orientation in THA using CT-based and accelerometer-based navigation systems. This retrospective study included 35 consecutive patients (11 males, 24 females; mean age, 65 years) who underwent primary cementless THA via an anterolateral approach in the supine position. Both CT-based and accelerometer-based navigation systems were used simultaneously. The accuracy of cup orientation was compared between the two systems using postoperative CT. The accuracy of cup inclination was 2.7° ± 2.0° in the CT-based group and 3.3° ± 2.4° in the accelerometer-based group. The accuracy of cup anteversion was 2.8° ± 2.6° in the CT-based group and 3.4° ± 2.2° in the accelerometer-based group. No significant difference was observed in cup inclination (p = 0.29) or cup anteversion (p = 0.34) between CT-based and accelerometer-based navigation. The accuracy of cup positioning did not differ significantly between CT-based and accelerometer-based navigation systems.