抄録
Symptoms of lumbar spondylolysis in young adults without remarkable slippage arise from two types of pathology. Synovitis in a pseudoarthritic site of a pars defect may cause lower back pain. Alternatively, a bony ragged edge of spondylolysis and/or a fibrocartilagenous mass around the defect may impinge on the nerve root. These two pathologies may sometimes be combined. In such cases, we perform decompression of the nerve root and direct repair of the defects.
For direct defect repair, we use the percutaneous pedicle screw and hook-rod system as a minimally invasive procedure. The most important point of the surgery is to remove only the ragged edge impinging on the nerve root in order to preserve the area for a bone graft.
Although the short-term clinical outcomes are good, attention should be paid to the union rate of the defects and changes in the discs adjacent to the level of repair.
