CT measures of femoral and tibial version and rotational position of femoral and tibial components of knee replacements: limitations in reliability and suitability for routine clinical practice

ConclusionThe lower 95% confidence level for ICC of version and rotational measurements using the Berger protocol of TKRs on CT are all less than 0.73 and that the normal range of differences between observers is up to 9 ° for the femoral component and 26° for the tibial component. This suggests that CT measurements derived from the Berger protocol may not be consistent enough for clinical practice.Key Points•CT is commonly used to measure the rotational profile of knee replacements in symptomatic patients using the Berger protocol.•The limits of agreement for both femoral and tibial component rotation are wide even for experienced observers.•CT measurements of the rotation of knee arthroplasty are not reliable enough for routine clinical use.
Source: European Radiology - Category: Radiology Source Type: research