Fig. 4

Graphs of the correlation between parameters.

The graph shows the correlation between flexion angle with normal insert and intra-operative flexion angle difference (with specially-made insert – with normal insert) (a), the correlation between pre-operative flexion angle and intra-operative flexion angle difference (with specially-made insert – with normal insert) (b), the correlation between body mass index and intra-operative flexion angle difference (with specially-made insert – with normal insert) (c), and the correlation between intra-operative flexion angle and the post-operative flexion angle after 2 years (d)