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Incidence and Risk Factors of PJK in AIS Patients Treated With Patient-Specific Rods
Amellal Omar1, Othmane Miri1, Simon Vandergugten1,2
1Service d'Orthopédie et Traumatologie, Cliniques Universitaires Saint-Luc, Bruxelles.
Clinical Spine Surgery
|May 8, 2026
Summary
Proximal junctional kyphosis (PJK) affects 20% of adolescent idiopathic scoliosis patients treated with patient-specific rods. A larger postoperative proximal junctional angle is a risk factor, but PJK did not impact short-term clinical outcomes.
Area of Science:
- Spine surgery
- Orthopedics
- Pediatric orthopedics
Background:
- Proximal junctional kyphosis (PJK) is a common complication after scoliosis surgery.
- The impact of patient-specific rods on PJK incidence is not well understood.
Purpose of the Study:
- To determine the incidence and risk factors of PJK in adolescent idiopathic scoliosis (AIS) patients treated with patient-specific rods.
- To assess the clinical impact of PJK using Scoliosis Research Society-22 (SRS-22) scores.
Main Methods:
- Retrospective cohort study of 50 AIS patients undergoing posterior spinal fusion with patient-specific rods.
- Minimum 18-month follow-up, assessing radiographic parameters and SRS-22 scores.
- Logistic regression analysis identified risk factors for PJK development.
Main Results:
- PJK incidence was 20% (10 of 50 patients) at final follow-up.
- A larger immediate postoperative proximal junctional angle (PJA) was significantly associated with PJK.
- No significant differences in SRS-22 scores were observed between patients with and without PJK.
Conclusions:
- The incidence of PJK in AIS patients treated with patient-specific rods is 20%.
- Immediate postoperative PJA is a significant risk factor for PJK development.
- PJK did not negatively affect short-term clinical outcomes in this patient cohort.
Keywords:
adolescent idiopathic scoliosispatient-specific implantproximal junctional kyphosissagittal alignmentscoliosis surgeryMore Related Videos
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