This article is part of our Fantasy Baseball Injury Report series.
The Mariners ace hopes to return this week after missing his last start with an oblique strain. Initially diagnosed as a back injury, it was later revealed that Hernandez had strained his left oblique. While the difference may seem immense, understand the core is made up of muscles in the trunk, back, and neck. An oblique injury can have an indirect effect on other muscles of the core that could spell trouble for a pitcher with a history of lower back problems.
There are two sets of oblique muscles each located on either side of the rib cage. Each set is divided into two groups, the external obliques and the internal obliques and work synergistically with the opposite groups located on the contralateral side. The thin muscles on one side contract with the other group on the opposite side to complete trunk rotation. For a right-handed pitcher like Hernandez, this means his left internal obliques contract along with his right external ob
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