Sacroiliac Joint is the connection between the sacrum at the base of the spine and the ilium of the pelvis. This joint transfers forces between the upper body and legs while allowing limited movement. Irritation, restricted motion, or nearby muscle tension can contribute to pain felt in the lower back, buttock, or hip.
Also called: SI Joint
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Sciatic Nerve is the body’s largest peripheral nerve, formed by nerve roots in the lower spine and pelvis. It travels through the buttock and down each leg, carrying signals for movement and sensation. Irritation or pressure along this pathway may produce pain, tingling, numbness, or weakness known as sciatica.
Also called: Ischiadic Nerve
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Spinal Alignment is the arrangement and movement relationship of the vertebrae, joints, and supporting tissues along the spine. The term describes how these structures relate to one another during standing, sitting, and movement. Chiropractors assess alignment through posture, joint motion, and physical findings, not through appearance alone.
Also called: Vertebral Alignment
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Spinal Stenosis is a narrowing of the spaces within the spine that can reduce room for the spinal cord or nerve roots. The narrowing may develop in the neck or lower back. Changes in bones, discs, joints, or ligaments can contribute to pressure that affects movement, sensation, or strength.
Also called: Narrowing of the Spine
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A sprain is a ligament injury caused by stretching or tearing the tough tissue that connects bone to bone at a joint. Sprains commonly affect the ankle, knee, wrist, or thumb after a twist, fall, sudden impact, or awkward landing. Severity can range from mild stretching to a partial or complete tear.
Also called: Ligament Injury
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A strain is an injury to a muscle or tendon caused by overstretching or tearing its fibers. Strains often develop during sports, lifting, sudden movements, or repeated physical stress. Symptoms may include localized pain, tenderness, swelling, weakness, or reduced movement. The injury may affect the muscle, its tendon, or both.
Also called: Muscle Injury
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Suboccipital Muscles are small muscles at the base of the skull that connect the upper neck with the head. They help control head position, guide subtle neck movement, and provide sensory information about posture. Tension or tenderness in this area may contribute to neck discomfort or headache patterns that begin near the back of the head.
Also called: Suboccipital Group
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