Which factor MOST directly causes SI fixation?

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Multiple Choice

Which factor MOST directly causes SI fixation?

Explanation:
Ligament adhesions directly immobilize the sacroiliac joint by forming fibrous bridges between the sacrum and ilium, effectively locking the joint and reducing its normal range of motion. This structural tethering is the primary manner by which SI fixation occurs. Edema may accompany inflammation and cause pain and temporary guarding, but it does not create a true fixed restriction of the joint. Myospasm can limit movement through muscle guarding, yet it’s not a permanent fixation of the joint itself. Disc degeneration involves the lumbar region and intervertebral discs, not the sacroiliac joint’s fixation mechanism.

Ligament adhesions directly immobilize the sacroiliac joint by forming fibrous bridges between the sacrum and ilium, effectively locking the joint and reducing its normal range of motion. This structural tethering is the primary manner by which SI fixation occurs. Edema may accompany inflammation and cause pain and temporary guarding, but it does not create a true fixed restriction of the joint. Myospasm can limit movement through muscle guarding, yet it’s not a permanent fixation of the joint itself. Disc degeneration involves the lumbar region and intervertebral discs, not the sacroiliac joint’s fixation mechanism.

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