Pedicle Screw: Purpose, Placement, and What Patients Should Know

A pedicle screw is a threaded implant inserted through the pedicle, a short bridge of bone at the back of a vertebra. It connects to rods or other hardware and helps hold vertebrae in a planned position. The screw is part of a construct; it is not usually used alone.

Placement is planned with imaging and surgical measurements because the pedicle sits close to nerves, the spinal canal, and blood vessels. The number and position of screws depend on the levels being treated and the goal of surgery.

Pedicle screws are designed to resist pulling and rotational forces while the spine is being stabilised. They are commonly made from implant metals selected for strength and compatibility with the body. Design features can vary, including thread shape, diameter, length, and whether the head can be adjusted to meet the rod.

Pedicle screws are used in operations that need posterior spinal support, including some deformity corrections, fractures, instability procedures, and spinal fusion constructs. In scoliosis care, they can help the surgeon guide and hold correction across selected vertebrae. Learn more in [Scoliosis Surgery](/treatments/spine-care/scoliosis-surgery/) and [Spinal Fusion](/treatments/spine-care/spinal-fusion/).

Not every spinal problem needs screws. Depending on the diagnosis, options may include physiotherapy, observation, medicines, decompression without fusion, or another fixation design. Anterior plates, hooks, wires, or different screw systems may be selected when anatomy or the surgical objective makes them more suitable.

The implant is intended to support alignment while bone healing or stabilisation progresses; it does not by itself treat every source of back or leg symptoms. Before surgery, ask which levels will be instrumented, whether fusion is planned, how movement will be protected during recovery, and which symptoms should trigger an urgent call.

Pedicle screws are often left in place after healing, unless removal is recommended for a specific reason. Risks include infection, nerve irritation, screw loosening, breakage, or a problem with fusion. New weakness, loss of bladder or bowel control, fever, wound drainage, or severe increasing pain needs prompt medical assessment.