What question did this study set out to answer?

To evaluate the associations between continuous measurements of sagittal translation and segmental angulation with paraspinal muscle cross-sectional area (CSA) asymmetry and total CSA at L4–5 in lumbar spinal stenosis.

August 20, 2026Physical Therapy KoreaOpen Access

Association of L4–5 Segmental Instability Parameters With Paraspinal Muscle CSA in Lumbar Spinal Stenosis: An MRI-Based Study

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Authors

JAJun-su AhnYonsei University UHUi‐jae HwangHong Kong Polytechnic University HKHyung-suk KimMizMedi Hospital

Discussion

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Implication

Cross-sectional study finds sagittal translation correlates with erector spinae asymmetry in lumbar spinal stenosis, indicating distinct mechanical motion roles.

Key Points

To evaluate the associations between continuous measurements of sagittal translation and segmental angulation with paraspinal muscle cross-sectional area (CSA) asymmetry and total CSA at L4–5 in lumbar spinal stenosis.
Analyzed 85 patients with lumbar spinal stenosis (47 female, 38 male).
Measured sagittal translation (mm) and segmental angulation (degrees) on flexion-extension radiographs, and bilateral paraspinal muscle CSA on L4–5 mid-disc MRI.
Calculated partial correlations between instability parameters and muscle CSA measurements after controlling for age, sex, and body mass index.
Mean sagittal translation was 2.15 ± 1.58 mm and mean segmental angulation was 8.80° ± 5.51°, with a weak correlation between them (partial r = 0.260, p < 0.05).
Sagittal translation showed a weak positive correlation with erector spinae CSA asymmetry (partial r = 0.223, p < 0.05), but was not associated with psoas major asymmetry, multifidus asymmetry, or total CSA in any muscle group.
Segmental angulation demonstrated no significant association with paraspinal muscle CSA asymmetry or total CSA.

Cite This Study

Ahn et al. (2026) studied this question.

synapsesocial.com/papers/6a86b57f8a91293e6a1ccf5d https://doi.org/10.12674/ptk.2026.33.2.133

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Implication

Cross-sectional study finds sagittal translation correlates with erector spinae asymmetry in lumbar spinal stenosis, indicating distinct mechanical motion roles.

Association of L4–5 Segmental Instability Parameters With Paraspinal Muscle CSA in Lumbar Spinal Stenosis: An MRI-Based Study

Discussion

Member takes

Implication

Key Points

Cite This Study

Association of L4–5 Segmental Instability Parameters With Paraspinal Muscle CSA in Lumbar Spinal Stenosis: An MRI-Based Study

Discussion

Member takes

Implication

Key Points

Cite This Study

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