Table 6 Studies investigating the association between implants’ axial malalignment and revision rates (aTRA, aFRA, aTFMA/aTFCA)
Author | RAQ criteria for radiological bias | Association between malalignment and worse outcome | Sample size | Alignment data | Findings |
|---|---|---|---|---|---|
Kim et al. (2014) | Low risk | Yes | 3048 | Rotational alignment of femoral component: 2490 the rotational alignment of the femoral component was 2–5° external rotation, in 401 knees the rotational alignment was <2° external rotation, and in 157 knees the external rotation was >5° | No revisions required for the 2–5° external rotation group. 27 revisions in the <2° external rotation group (p < 0.0001) and 3 revisions in the >5° group (p = 0.029) |
Rotational alignment of tibial component: 2490 the rotational alignment of the femoral component was 2–5° external rotation, in 413 knees the rotational alignment was <2° external rotation, and in 145 knees the external rotation was >5° | 1 revision required for the 2–5° external rotation group. 27 revisions in the <2° external rotation group (p < 0.0001) and 2 revisions in the >5° group (p = 0.034) |