Unveiling the hidden dynamics: patellar support tissue alterations in post-stroke rehabilitation.
Yongqian Han, Shaofang Li, Juchuan Dong and 3 others
In 70 stroke patients, ultrasound showed the soft tissues around the knee patella differ between the affected and unaffected sides, with the pattern changing after 60 days.
Both legs need targeted attention in knee rehabilitation, not just the weak side.
Key findings
1Between the affected and unaffected sides, the horizontal imbalance (the thickness difference between the lateral and medial retinacula) was statistically significant (p = 0.047).
2The quadriceps tendon showed higher grayscale on the unaffected side (p = 0.008), while the medial support structure showed higher grayscale on the affected side (p = 0.033).
3When patients were split at the 60-day mark, the vertical imbalance on the affected side differed significantly between the two groups (p = 0.013), and the patellar tendon grayscale delta also differed (p = 0.040).
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What it does not show
Cross-sectional design: patients with different disease durations were compared to each other, so the 'temporal' pattern is an inference from between-group differences, not a tracked change in the same person over time. The authors state this explicitly. No healthy control group. The unaffected leg was used as the within-person reference, but the authors acknowledge that bilateral degenerative changes have been documented in post-stroke patients, so the 'unaffected' side may not represent true normal anatomy. The 60-day split point was chosen after examining the data (the authors describe it as arising from a prior examination of thickness and grayscale before the full analysis), which introduces a post-hoc element. The 'vertical power' and 'horizontal power' indices are explicitly described as exploratory, unvalidated, and not yet standardised biomechanical measures. Ultrasound was used rather than MRI; the authors note it may carry a higher risk of error for tendons and supporting ligaments. Tissue thickness and grayscale were measured, not tissue strength; the causal link between the two is acknowledged as unproven. Ischaemic and haemorrhagic strokes were not analysed separately, despite potentially different recovery trajectories. The age range of 30–80 years is broad and may introduce age-related degeneration bias. Single centre, single country, 70 patients; generalisability is limited.
Declared interests
Funded by the Yunnan Revitalization Talent Support Program (XDYC-MY-2022-0033) and the Education Department of Yunnan Province (2024J0350). No industry sponsor, no device or drug manufacturer involvement declared.
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