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Table 5 Studies investigating the association between implants’ sagittal malalignment and revision rates (sTA, sFA)

From: Does malalignment affect revision rate in total knee replacements: a systematic review of the literature

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

Femoral component 1735 neutrally aligned group (0–3°), 748 were classed as the flexion group(>3° flexion) and 565 classed as extension group(>1° extension)

No revisions in neutral group. 25 (3.3 %) revisions in the flexion group (p = 0.0029). 5 (0.9 %) revisions in the extension group (p = 0.2)

Tibial component 2465 in the neutrally aligned group (0–7°), 553 in the abnormally aligned group (<0 and >7°)

Five revisions in neutrally aligned group. 25 revisions in the abnormally aligned group (p < 0.0001)