Clinical evidence

Measured, published, replicated.

Six peer-reviewed studies from six centres in Australia and Japan, using different approaches, patient positions and comparators, converge on the same finding: the Navbit inertial platform measures cup orientation to within a few degrees of post-operative imaging, and more accurately than the instruments it was tested against.

6Peer-reviewed studies

400+Patients across 6 clinical studies

2.1–3.7^°Range of study-level mean inclination error vs CT

96–99^%Within 10° of the reference angle

Publications

Eur J Orthop Surg Traumatol2026

Comparison of the accuracy for cup positioning between portable inertial navigation systems and manual methods in the anterolateral supine position

54 navigated of 105 hips, same cup, surgeon and targets. Placement error 3.6° ± 2.7° / 2.6° ± 2.5° vs 6.0° ± 4.0° / 4.5° ± 3.5° manual (p = 0.001). 92.6% inside the Lewinnek safe zone vs 74.5% (p = 0.012).

Kuroda Y, Kamenaga T, Nakano N, et al.

Arthroplasty Today2025

Effects of the flip technique on measurement accuracy of the acetabular cup position in the lateral decubitus position

78 flip vs 54 direct lateral registrations. Both reliable: 97–98% of inclination and 96–99% of anteversion measurements within 10°. Surgeons can choose the workflow that suits their theatre.

Tanino H, Mitsutake R, Ito H

Cureus2024

Accuracy of cup alignment in total hip arthroplasty: a comparison between portable navigation and goniometer

Error 2.1° ± 1.7° / 2.0° ± 1.4° vs 3.4° / 3.4° supine and 3.4° / 5.0° lateral goniometer. 91% within 5° of target vs 64.5% and 56.3%.

Tetsunaga T, et al.

SICOT-J2024

Combining inertial navigation with the transacetabular ligament in direct anterior total hip arthroplasty

181 hips, matched manual cohort. 83% within ±5° of target inclination vs 53% manual; 97% within 10° vs 88%. A 35% reduction in cup-placement variability.

Maes V, Cossetto D

Scientific Reports2024

Measurement accuracy of the acetabular cup position using an inertial portable hip navigation system in the lateral decubitus position

54 hips, registered after draping. Error 2.8° ± 2.6° inclination / 3.9° ± 2.9° anteversion; 98% and 96% within 10°. Superior to the goniometer for anteversion (p < 0.001). Registration 3.6 ± 2.1 min.

Tanino H, Mitsutake R, Ito H

SICOT-J2023

Accuracy of acetabular component alignment with surgical guidance systems during hip arthroplasty

102 hips, inertial and optical navigation run simultaneously and scored against the same CT. 2.1° / 2.4° error vs 3.0° / 4.5° for optical (both significant). 98% within 10° vs 88%.

Xu J, Veltman ES, Chai Y, Walter WL

Studies report the Navbit Sprint, the validated predecessor of MARQ. MARQ preserves Sprint's sensing and registration method; its pre-market cadaver validation is summarised in the MARQ accuracy whitepaper below. Xu et al. is a designer-surgeon series; the remaining five are independent.

Whitepapers

The long form.

Three documents that set out the evidence, the method and the limitations, with every figure sourced.

Pre-market validation · February 2026

Clinical performance and accuracy data

A simulated-use cadaver validation of MARQ against CT ground truth: five surgeons, six specimens, eighteen devices, supine and lateral. Plus the predecessor evidence that carries across.

Read the whitepaper

0.2°Mean inclination error, supine

0.9°Mean anteversion error, supine

0.1°Mean inclination error, lateral

0.0°Mean anteversion error, lateral

Pre-operative planning

How Rapid considers spinopelvic mobility

The six parameters reported in the Rapid Surgical Plan, the published thresholds that define them, and the five peer-reviewed studies those thresholds come from.

Read the whitepaper

16%Of 1,088 arthroplasty patients had lumbar flatback deformity

71%Of dislocating cups sat inside the traditional safe zone

3.7×Adverse pelvic mobility in dislocating hips vs controls

6Parameters reported for surgeon review

Published evidence review · Navbit Sprint

Accuracy of the Navbit Sprint in total hip arthroplasty

Six peer-reviewed studies of inertial portable navigation for cup positioning: supine and lateral decubitus, against manual instruments and against camera-based navigation.

Read the whitepaper

6Studies, six centres, 400+ hips

96–99%Within 10° of the reference angle

92.6%Safe-zone placement vs 74.5% manual

3.6 minPin insertion and registration, lateral

Next step

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