[Biomechanical effect of anteromedial coronoid facet fracture and lateral collateral ligament complex injury on posteromedial rotational stability of elbow].

OBJECTIVE

To investigate the effect of anteromedial coronoid facet fracture and lateral collateral ligament complex (LCLC) injury on the posteromedial rotational stability of the elbow joint.

METHODS

The double elbows were obtained from 4 fresh adult male cadaveric specimens. Complete elbow joint (group A, n=8), simple LCLC injury (group B, n=4), simple anteromedial coronoid facet fracture (group C, n=4), and LCLC injury combined with anteromedial coronoid facet fracture (group D, n=8). The torque value was calculated according to the load-displacement curve.

RESULTS

There was no complete dislocation of the elbow during the experiment. The torque values of groups A, B, C, and D were (10.286±0.166), (5.775±0.124), (6.566±0.139), and (3.004±0.063) N·m respectively, showing significant differences between groups ( P<0.05).

CONCLUSION

Simple LCLC injury, simple anteromedial coronoid facet fracture, and combined both injury will affect the posteromedial rotational stability of the elbow.