Table 2.

Causative factors for sagittal and coronal plane outliers in order of incidence.

No.	Causative factor	Number of cases (≈%)
1	Hip centre error	55 (51%)
2	Heterogeneous cement mantle	20 (18.5%)
3	No obvious cause	11 (10%)
4	Suboptimal knee balance	10 (9.5%)
5	Ankle centre error	6 (5.5%)
6	Malalignment accepted by the surgeon	6 (5.5%)
	Total	108 (100%)