Of the following hip flexor muscles, which is considered to be the most significant contributor?

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The iliopsoas is considered to be the most significant contributor to hip flexion as it is made up of both the iliacus and psoas major muscles, which are powerful hip flexors. The rectus femoris also contributes to hip flexion but has a secondary role as a knee extensor. The tensor fascia latae and pectineus are also hip flexors but are smaller and less significant compared to the iliopsoas.

Of the Following Hip Flexor Muscles, Which Is Considered to Be