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Sacrum

The sacrum is a triangular-shaped bone structure at the bottom of the spine that forms a central part of the pelvis. It functions as a stabilizing bridge between the spine and the hip bones and plays an important role in the body’s movement and posture.

MRI Hip joint and pelvis
Magnetic resonance imaging

MRI Hip joint and pelvis

5 795 kr4 995 kr

Contents

Quick version

What is the sacrum?

The sacrum consists of five fused vertebrae (S1–S5) and is located between the hip bones. Together, they form a strong and rigid structure that connects the spine to the pelvic ring.

Anatomy and location

The sacrum is shaped like a triangle, with a broad upper part and a narrower lower part. It has joint surfaces on both sides that meet the upper part of the hip bone.

Function

The sacrum helps distribute body weight from the spine to the pelvis and legs. It provides stability to the body when we walk, stand, and run.

Joint connections

The sacrum is connected to the hip bone via the SI joint (sacroiliac joint) on each side of the pelvis. The SI joints are strong and have limited mobility, which helps relieve the spine during movement.

Development

At birth, the sacral vertebrae are completely separate. They gradually fuse together, and by the teenage years, they form a solid bone structure.

Common conditions and diseases

Pain in the sacrum can be caused by inflammation of the SI joints (sacroiliitis), fracture, wear and tear, misalignment, or overuse. During pregnancy, it is common to experience discomfort and pain in this area.

Examination and diagnosis

An assessment of the cause of pain can be made through a physical examination, the patient’s medical history, and imaging such as X-ray, CT, or MRI. Book an MRI examination of Hip & Pelvis here.

Relevant symptoms

  • Pain in the lower back
  • Stiffness during movement
  • Tenderness when pressing on the area
  • Pain when walking or standing
  • Pain radiating toward the hip or leg

Related conditions and diagnoses

  • Sacroiliitis
  • Lower back pain
  • Pelvic instability
  • Sacral fracture
  • Degenerative joint diseases

Questions and answers

The sacrum is located between the hip bones and is a triangular bone structure consisting of five fused vertebrae.

The sacrum helps distribute body weight evenly from the spine to the pelvis and legs. It also serves as an attachment point for muscles and ligaments in the lower back.

Pain in the sacrum can be caused by inflammation of the SI joints (sacroiliac joints), fracture, overuse, or degenerative changes.

Issues with the sacrum can be investigated through a physical examination, the patient’s description of the symptoms, and imaging techniques such as X-ray, CT, or MRI.

Yes, pregnancy involves hormonal changes and increased strain on the body, which can cause pain or instability in the area.

Pain in the sacrum can be treated with physiotherapy as well as pain-relieving and anti-inflammatory medications. Depending on the cause, injections may also be considered.

Sacroiliitis is an inflammation of the SI joints (sacroiliac joints). This condition can cause pain in the sacrum and sometimes radiate down into the legs.

Yes, pain in the sacrum is particularly common in people who put heavy strain on their back or suffer from joint inflammation.

Tests related to Sacrum

Skeleton and Joints

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MRI Hip joint and pelvis
Magnetic resonance imaging

MRI Hip joint and pelvis

Marker Icon 3 Biomarkers
Doctors comment
  • Recommended for hip pain, stiffness or lameness
  • Painless MRI examination with a high level of detail
  • MRI Hip/Pelvis – referral and appointment booked directly

5 795 kr4 995 kr