Authors:
T. Luijkx1, M. Maas2; 1Amsterdam, Utrecht/NL, 2Amsterdam/NL
DOI:
10.1594/essr2015/P-0116
Results
ECU displacement was significantly correlated to wrist position (radio-ulnar angle,
r=-0.492,
p<0.001) and MRI abnormalities of the ECU (r=-0.233,
p<0.049),
but did not correlate with ulnar-sided symptoms.
ECU position varied widely for each wrist position,
but subluxation (ECU displacement >0) was much more frequent in supinated (71%) than in pronated wrists (27%) (Figure 4).
Furthermore,
the upper limit of the 95% confidence interval for the mean ECU displacement was 86% subluxation in supination and only 31% subluxation in pronation,
suggesting that not only the frequency but also the extent of displacement is larger in supination (Figure 5). This is well illustrated in Figure 6,
showing both the range of ECU displacement and the spread around the mean.
Linear regression modelling resulted in a final model that included radio-ulnar angle (p<0.000) and ECU abnormalities on MRI (p=0.019) as significant explaining factors of the variation in ECU displacement (Figure 7).
Ulnar-sided symptoms (p=0.968),
age (p=0.227) and gender (p=0.251) did not show a significant contribution.
There was no significant difference in wrist positioning between MRI scanners (Figure 8).