The Development of New Scoring System to Define the Presence of Instability and the Need of Fusion in Degenerative Lumbar Spinal Stenosis - Jakarta Instability Score.

Study Design: Systematic review, expert opinion and Delphi technique, and validity and reliability studies.

Objective: We developed Jakarta Instability Score (JIS) to identify spinal instability and the need of fusion in degenerative lumbar spinal stenosis (LSS).

Methods: This study consisted of systematic review to find predictors of spinal instability, expert opinion and modified Delphi technique to develop JIS, and validity and reliability studies of the newly developed JIS.

Unilateral biportal endoscopic surgical decompression for symptomatic ossification of the ligamentum flavum - Is it enough to improve the clinical outcome? A case-control study.

Purpose: Open decompression is currently the standard surgical procedure for symptomatic OLF. As the minimal invasive method gains popularity, UBE is considered a reliable technique with less complication. However, the outcome is still in question.

Analysis on association between sagittal stem alignment and early functional and radiological outcome following primary cementless total hip replacement.

Introduction: Accurate reconstruction of hip anatomy and biomechanics is mandatory for achieving good clinical outcomes following total hip replacement (THR). Optimal stem alignment is essential to avoid impingement or loosening. This study aimed to evaluate sagittal stem position following cementless THR and its relationship with patient's functional outcome and post-operative radiological parameters.