In a lumbar strain, which muscle is involved?

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Multiple Choice

In a lumbar strain, which muscle is involved?

The main idea here is which lumbar muscle is most commonly involved when the lower back is strained and movement causes pain and spasm. The quadratus lumborum sits along the side of the lower back, attaching from the iliac crest up to the 12th rib and the lumbar vertebrae. Its job includes lateral flexion of the spine and helping stabilize the lower part of the ribcage during breathing, especially when you bend to the side or lift. If this muscle is overstretched or suddenly contracted during lifting or a sudden twist, its fibers can tear and it goes into spasm, producing the characteristic low-back or flank pain of a lumbar strain. That pattern makes quadratus lumborum the best answer. While the erector spinae group can also be strained, and the rectus abdominis is involved in front of the abdomen rather than the lower back, the quadratus lumborum’s location and role in lateral stabilization best explain the typical lumbar strain presentation. The multifidus are deep stabilizers of the spine and can contribute, but they’re less often the primary muscle implicated in a classic lumbar strain.

The main idea here is which lumbar muscle is most commonly involved when the lower back is strained and movement causes pain and spasm. The quadratus lumborum sits along the side of the lower back, attaching from the iliac crest up to the 12th rib and the lumbar vertebrae. Its job includes lateral flexion of the spine and helping stabilize the lower part of the ribcage during breathing, especially when you bend to the side or lift. If this muscle is overstretched or suddenly contracted during lifting or a sudden twist, its fibers can tear and it goes into spasm, producing the characteristic low-back or flank pain of a lumbar strain. That pattern makes quadratus lumborum the best answer.

While the erector spinae group can also be strained, and the rectus abdominis is involved in front of the abdomen rather than the lower back, the quadratus lumborum’s location and role in lateral stabilization best explain the typical lumbar strain presentation. The multifidus are deep stabilizers of the spine and can contribute, but they’re less often the primary muscle implicated in a classic lumbar strain.

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