Early Pixel Value Ratios to Assess Bone Healing During Distraction Osteogenesis

Area of Science:

• Orthopedic surgery
• Regenerative medicine
• Biomedical imaging analysis

Background:

• Distraction osteogenesis (DO) is a key technique for bone lengthening and reconstruction.
• Pixel Value Ratio (PVR) from X-rays is used to determine external fixator removal timing.
• Limited research exists on early PVR, its influencing factors, and clinical outcome correlations.

Purpose of the Study:

• To investigate early PVR trends in the first three months post-osteotomy.
• To identify factors influencing early PVR, including age, sex, BMI, and lengthening site.
• To explore the relationship between early PVR and clinical outcomes like Healing Index (HI) and Lengthening Index (LI).

Main Methods:

• Retrospective analysis of 125 patients undergoing bone lengthening.
• Monitoring of early PVR in regenerated bone during the initial three months.
• Statistical analysis of PVR variations based on demographic and surgical factors, and correlation with HI and LI.

Main Results:

• Early PVR shows a consistent increase over the first three months post-osteotomy.
• Juveniles and males exhibited significantly higher early PVR compared to adults and females, respectively.
• Femur lengthening showed higher PVR than tibia; BMI and internal fixation did not significantly impact early PVR. Early PVR correlated inversely with HI and LI.

Conclusions:

• Early PVR is dynamic and influenced by patient age, sex, and bone site.
• The PVR trajectory in early bone regeneration may serve as a predictor of clinical outcomes in DO.
• Findings can aid in optimizing clinical management for patients undergoing bone lengthening.