The multi-bundle structure of the medial ulnar collateral ligament (mUCL) has been documented [1]. Mechanically, the anterior bundle of the mUCL is the primary restraint to valgus stress of the elbow [2] and research has indicated that the anterior band of this bundle becomes taut in extension while the posterior band becomes taut in flexion [3]. Injury of the mUCL in throwing athletes due to overuse or extreme valgus load can require surgical repair. In order to achieve a successful surgical reconstruction of the UCL, one can expect the appropriate tension during graft placement to be an important variable. The strain in the ligament is known to vary with flexion angle. Therefore, the in situ strains of the mUCL are potentially vital information and determination of a flexion angle at which the native ligament has no strain may guide the repair. To determine the slack length, i.e., the reference length with no strain, previous work examined the particular regions of the anterior and posterior bands [3]. The slack length was readily determined, but all regions did not behave in the same way. The purpose of the current work was to determine whether a consistent behavior was apparent in each of the bands, that is, to determine if bands could be identified by consistent strains along their lengths.

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