What to do: Patient lies supine. Lift one leg straight up. Positive sign: The patient feels pain in the SI joint or sacrum. When the clinician provides external compression to the iliac crests (squeezing the pelvis), the pain reduces. Interpretation: The pain reduces because external compression mimics the force closure that the Andersson Link should provide. If manual compression helps, the link is weak.
In the field of data science and bibliometrics, an "Andersson Link" typically refers to a concept found in research regarding link prediction in author cooperation networks.
If you have identified an Andersson Link dysfunction, here is a tiered approach to fixing it. andersson link
This is the lateral hamstring muscle. Its long head originates from the ischial tuberosity, merging with the sacrotuberous ligament fibers. Therefore, tension in the hamstring pulls directly on the STL, which pulls on the sacrum.
What to do: Patient stands. Therapist palpates PSIS. Patient flexes hip to 90 degrees. Interpretation: The PSIS should move inferiorly (down). If it does not move, or if the motion is jerky, the Andersson Link is failing due to hamstring hypertonicity or STL restriction. What to do: Patient lies supine
The posterior layer of the TLF is a dense connective tissue that covers the deep muscles of the back. It attaches medially to the spinous processes of the lumbar vertebrae and laterally to the iliac crest.
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