Human Pelvis Structural Model With 5 Pcs Lumbar Vertebrae

Quick Answer: This pelvis model with lumbar vertebrae combines the bony pelvis with the five lumbar vertebrae, L1 to L5, attached above the sacrum. It is used to teach how the lower spine and the pelvis work as one unit in posture, load bearing and back pain.

Where the Spine Meets the Pelvis

Adding the five lumbar vertebrae to a pelvis turns a model of a ring into a model of a junction. The fifth lumbar vertebra rests on the sacrum at the lumbosacral joint, tilted forward on a sloping upper sacral surface, and is held there by its facet joints, the L5-S1 disc and the strong iliolumbar ligaments running to the iliac crests. The sacrum is wedged between the two hip bones at the sacroiliac joints, so the whole weight of the trunk passes through this short region on its way to the legs.

The model shows how posture links the two parts. Tilting the pelvis forward deepens the lumbar curve, and tilting it backward flattens it; tight hip flexors, weak abdominal muscles or pregnancy all shift this balance. Students can also see why the L5-S1 level is a common site of trouble, from disc herniation to spondylolisthesis, where L5 slips forward on the sloping sacrum, and look for normal variants such as a partly fused, or sacralised, fifth lumbar vertebra.

The title confirms five lumbar vertebrae and a structural pelvis but not the sex of the pelvis, the scale, or whether discs, femur heads or ligaments are included, so confirm these. The hip joint model adds the joint below, and the lumbar spinal column model concentrates on the nerves above.

Applications

• Physiotherapy and chiropractic teaching of pelvic tilt, posture and the lumbar curve
• Anatomy lessons on the lumbosacral and sacroiliac joints
• Explaining low back pain, spondylolisthesis and sacroiliac joint problems to patients
• Ergonomics training on sitting and lifting posture

Care & Handling

• Carry the pelvis model with lumbar vertebrae by the pelvis, never by the lumbar column, which can snap at the lumbosacral join.
• Keep the column upright and avoid bending it sideways beyond its natural range during demonstrations.
• Dust the sacral openings and the gaps between vertebrae with a soft brush, and keep the model boxed when not in use.

Specifications

Why Choose LabEquip

Physiotherapy clinics, chiropractic colleges and anatomy departments buy a pelvis with lumbar vertebrae because many low back problems sit exactly at this junction. LabEquip lists it in biology lab products; ask about its sex, scale and parts through the contact page.

Frequently Asked Questions

Why include lumbar vertebrae with a pelvis model?

Many back and hip problems involve the junction between the two. Seeing L1 to L5 on the sacrum shows how posture of the pelvis changes the lumbar curve and how load passes from spine to legs.

What is the lumbosacral joint?

The joint between the fifth lumbar vertebra and the sacrum, made up of the L5-S1 disc in front and a pair of facet joints behind. It sits on a slope, so ligaments and facets are needed to stop L5 sliding forward.

What is pelvic tilt?

The forward or backward rotation of the pelvis around the hip joints. Anterior tilt increases the lumbar curve and posterior tilt flattens it, which is why the posture of the pelvis matters in back pain.

What is sacralisation of L5?

A normal variant in which the fifth lumbar vertebra is partly or fully fused to the sacrum, often through an enlarged transverse process. It changes how the lowest segments move and is usually found by chance on X-ray.

Can the sacroiliac joint cause pain?

Yes. It moves only a little, but strain, inflammation or the ligament laxity of pregnancy can make it painful, usually felt low in the back or buttock on one side.

How does the model help with lifting training?

It shows that the load of lifting ends up at the lower lumbar discs and the lumbosacral junction. Trainers use it to explain why a neutral spine and a load close to the body reduce strain there.

Last Updated: September 2026