PJKPredict: Spine Risk Radar

Adult Spinal Deformity Risk Modeling & Biomechanical Alignment Simulator

Clinical Disclaimer: PJKPredict is a specialized biomechanical calculator and surgical planning reference tool intended for board-certified orthopedic spine surgeons, neurosurgeons, spine surgery fellows, and surgical teams. It computes published predictive scores (Yilgor GAP score, Lafage-ISSG logistic risk models, Schwab age-adjusted alignment corridors) to assist in surgical planning. It does not replace individualized clinical judgment, multidisciplinary surgical evaluation, or institutional patient-specific assessment.

Developer & Support Contact

Direct Physician Support & Feedback

Developed by A. Alex Mohit, MD, PhD — Practicing Complex Spine Surgeon & Neurosurgeon.

✉️ mohalex@gmail.com

Phone / SMS Support: +1 (206) 679-5710

For clinical inquiries, bug reports, feature requests, or algorithm calibration feedback, please email with your device model, iOS version, and details of the case scenario. Responses are typically provided within 24 hours.

Core Biomechanical Capabilities

GAP ScoreYilgor Global Alignment & Proportion Score: Full 5-component proportional formula evaluating Relative Pelvic Version, Relative Lumbar Lordosis, Lordosis Distribution Index (LDI), Relative Spinopelvic Alignment, and Age factors.
ISSG ModelLafage-ISSG Multivariable Risk Engine: Logistic regression assessing construct overcorrection, UIV thoracic transition selection, baseline SVA, and 3-column osteotomy biomechanics.
Schwab CorridorsAge-Adjusted Spinopelvic Corridors: Correlates PT, PI-LL, and SVA across 5 age demographics (<35, 35-49, 50-64, 65-74, ≥75) to prevent catastrophic junctional breakdown.
HIPAA CompliantDe-Identification by Design: Embedded DICOM/EXIF metadata is excised on-device. Images for landmark AI are processed via stateless, ephemeral in-memory edge isolates with zero persistent storage.
100% On-DeviceDeterministic Execution: All spine landmark trigonometry, shear vector calculations, and risk modeling execute 100% locally on the device without external dependencies.

Privacy & Regulatory Compliance

Patient Data Protection (HIPAA Safe Harbor)

PJKPredict collects zero patient names, MRNs, hospital account numbers, or personal identifying information. Full details regarding our ephemeral AI processing and zero-storage architecture are available in our official Privacy Policy.

Read Complete Privacy Policy →

Frequently Asked Questions

Is an internet connection or account login required?

No. PJKPredict is completely autonomous and operates in airplane mode. All mathematical calculations, anatomical landmark trigonometry, and PDF clinical reports run locally on your device.

How do I export the surgical dossier?

Tap the "Export Dossier" button on the Results Dashboard. A high-resolution 2-page vector clinical PDF is generated with full spinopelvic parameters, alignment radar, and mathematical derivations ready for hospital chart inclusion or AirDrop.

App Details & Disclosures

Version: 1.1.0 (Build 2)
Compatibility: Requires iOS 17.0 or later. Optimized for iPhone and iPad Pro.
Category: Medical / Health & Fitness
Age Rating: 4+ (Health & Wellness / Medical Reference)
Privacy Policy: https://alexmohit825.github.io/PJKPredict/privacy.html