In vitro biomechanical study of rotational stabilizers of the XXXX elbow joint.

@entity235 @entity10036 @entity1650 @entity41713
OBJECTIVE: To develop a model for measuring rotary stability of the @entity235 elbow joint and to evaluate the relative contribution of the @entity1650 ( @entity1650 ), @entity41713 ( @entity41713 ), and @entity10036 ( @entity10036 ). SAMPLE POPULATION: 18 forelimbs from 12 @entity235 cadavers. PROCEDURE: Forelimbs were allocated to 3 experimental groups (6 forelimbs/group). Each intact forelimb was placed in extension at an angle of 135 degrees and cycled 50 times from -16 degrees (pronation) to +28 degrees (supination) in a continuous manner at 2.0 Hz. Cycling was repeated following sectioning of the structure of interest (group 1, @entity1650 ; group 2, @entity41713 ; and group 3, @entity10036 ). Torque at -12 degrees (pronation) and +18 degrees (supination) was measured for each intact and experimentally sectioned limb. A Student t test was performed to compare torque values obtained from intact verses experimentally sectioned limbs and for comparison with established criteria for differentiation of primary (> or = 33%), secondary (10 to 33%), and tertiary rotational stabilizers (< 10%). RESULTS: In pronation, the @entity1650 was the only primary stabilizer (65%). For supination, the @entity41713 was a primary stabilizer (48%), @entity1650 was a secondary stabilizer (24%), and @entity10036 was a tertiary stabilizer (7%). CONCLUSIONS AND CLINICAL RELEVANCE: With the elbow joint in extension at an angle of 135 degrees, the @entity1650 is a primary rotational stabilizer in pronation, and the @entity41713 is a primary stabilizer in supination. Disruption of the @entity1650 or @entity41713 may affect rotary range of motion or compromise stability of the elbow joint in @entity235 .
