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Decreased active range of motion often indicates pain or musclespasm; intervertebral disk disease is a particularly common cause.
Acute musclespasms may be relieved by ice or heat.
Musclespasm induced by straight leg raising suggests intervertebral disk disease; pain induced by straight leg raising may also suggest this but is less specific.
Lumbar musclespasms are involuntary contractions of the muscles of the lumbar region of the back (the lower back).
Musclespasms can also happen without muscle injury, as a reflex phenomenon from irritated deeper structures, including torn ligaments, infections, tumors, or chronic disc irritation, or herniation.
The cause of the musclespasm lies in the fact that the bulging disc is pressing against the ligament that holds it in place.