Research-use online calculator for estimating the probability of recurrent lumbar disc herniation (rLDH) within 2 years after percutaneous endoscopic lumbar discectomy (PELD).
Calculator URL: https://hang0418.github.io/Nomogram/
This repository supports an external validation, recalibration, and same-predictor model-updating study of a previously published clinical nomogram for 2-year rLDH after PELD.
The repository is intended to make the calculator and model documentation easier to inspect, cite, and use for research communication. It does not contain original patient-level data.
index.html: static client-side web calculator.MODEL_CARD.md: model scope, intended use, inputs, limitations, and validation summary.FORMULAS.md: original-model recalibration and updated-model formulas.DISCLAIMER.md: research-use and clinical-safety statement.examples/example_input.json: example patient input used for calculator verification.
The calculator uses five routinely available predictors:
- Age, years
- Body mass index (BMI), kg/m2
- Modic change
- Pfirrmann grade
- Sagittal range of motion (sROM), degrees
The online calculator uses the clinically constrained updated model. The model keeps the same five predictors as the original published nomogram and re-estimates the coefficients using the development and temporal-validation cohorts. It was then evaluated in an independent geographic-validation cohort.
The calculator does not use patient-level data and does not send entered values to a server. All calculations are performed locally in the browser.
This is a research-use risk-estimation tool. It may support individualized risk communication and follow-up planning after PELD, but it should not determine revision surgery or replace clinical judgment.
Further prospective multicenter validation is needed before routine clinical implementation.
Citation information will be updated after manuscript acceptance. Before publication, please cite this repository as:
He H. Nomogram for rLDH After PELD: research-use online calculator and model documentation. GitHub repository. https://github.com/Hang0418/Nomogram
No patient-level data are stored in this repository. The calculator is static and client-side only.