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Updated: Aug 12, 2025

Quantitative Magnetic Resonance Imaging of Skeletal Muscle Disease

Quantitative Magnetic Resonance Imaging of Skeletal Muscle Disease

Published on: December 18, 2016

Evaluating Changes to the Modified K-Line Using Kinematic MRIs.

Zabiullah Bajouri¹, Sagar Telang², Zoe Fresquez²

¹Department of Neurological Surgery, Keck School of Medicine USC, Los Angeles, CA.

|February 2, 2023

Summary

This summary is machine-generated.

The K-line measurement in cervical myelopathy patients shows a significant increase in distance when the spine is in extension compared to neutral. This finding is crucial for surgical planning in posterior cervical decompression and fusion.

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Area of Science:

Radiology
Neurosurgery
Spinal Surgery

Background:

The modified K-line is a radiological tool for cervical spine surgical planning.
Posterior cervical decompression and fusion may alter spinal alignment, potentially impacting K-line measurements.
Extension K-lines may offer improved utility in specific surgical contexts.

Purpose of the Study:

To investigate the differences in K-line measurements between neutral and extension positions in patients with cervical myelopathy.
To evaluate the clinical relevance of extension K-lines for surgical planning.

Main Methods:

Retrospective cross-sectional review of 97 patients with cervical MRI in neutral and extension.
Measurement of the K-line distance from the posterior disk to the K-line at C2-C7 levels.
Paired t-tests were used to analyze differences between neutral and extension measurements.

Main Results:

A statistically significant increase in the K-line distance was observed in extension compared to neutral across all cervical levels (P <0.001).
The average increase in distance ranged from 0.9 mm to 2.6 mm between C2-C7.
The most significant changes were noted between C3-C4 and C4-C5 levels.

Conclusions:

Extension K-lines demonstrate a significant increase in distance compared to neutral, particularly between C3 and C6.
This finding is clinically relevant for surgeons planning posterior cervical decompression and fusion.
Utilizing extension K-lines may optimize patient selection and improve postoperative outcomes for cervical myelopathy.