7d (edited) • General discussion
X-rays and MRIs are NOT the whole story
A pars stress at L5 (spondylolysis) reduces the posterior system’s ability to check shear during repetitive extension + rotation. If that instability progresses, the L5 body can glide forward (spondylolisthesis), shifting load to the disc, stealing stability from the facets, and narrowing the canal/foramen—often provoking back pain, leg pain, numbness, or weakness.
But remember: a two-dimensional image is only a snapshot of what we can’t see in motion. We are not slaves to an image. Applied Functional Science (Gray/Tiberio) teaches that the spine, pelvis, hips, and feet live in three planes and react as a chain. How you move under gravity and ground reaction forces matters as much—or more—than what a picture shows.
Bottom line: spondylolysis/spondylolisthesis are breakdowns in load control—not life sentences from an X-ray. Assess in 3D, treat the chain, and restore task-specific control so the image doesn’t dictate your function.
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X-rays and MRIs are NOT the whole story
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