Foot flexibility confounds the assessment of triceps surae extensibility in children with spastic paresis during typical physical examinations.
cross_sectional · Level IV
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- Record sourced from PubMed, PMID 31879075.
- Also identified by DOI 10.1016/j.jbiomech.2019.109532.
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Abstract
Accurate assessment of the talo-crural (ankle) joint angle at physical examination is important for assessing extensibility of m. triceps surae (TS) in children with spastic cerebral paresis (SCP). The main aim of this study was to quantify foot flexibility during standardized measurements of TS muscle-tendon complex extensibility (i.e. based on foot-sole rotation) in SCP children, and typical developed (TD) ones. Additionally, we aim to define a method that minimizes the confounding effects of foot flexibility on estimates of talo-crural joint angles and TS extensibility. Children, aged 6-13 years, with SCP (GMFCS I-III, n = 13) and TD children (n = 14) participated in this study. Externally applied -1 Nm, 0 Nm, 1 Nm and 4 Nm dorsal flexion foot plate moments were imposed. Resulting TS origin-insertion lengths, foot sole (φ<sub>FoSo</sub>) rotations, and changes in talo-crural joint angle (φ<sub>TaCr</sub>) were measured. Foot flexibility was quantified as Δ(φ<sub>TaCr</sub> -φ<sub>FoSo</sub>) between the 0 Nm and 4 Nm dorsal flexion conditions. In both groups, φ<sub>FoSo</sub> rotations of approximately 20° were observed between 0 Nm and 4 Nm dorsal flexion, of which about 6° (≈30%) was related to foot flexibility. Foot flexibility correlated to φ<sub>FoSo</sub> (r = 0.69) but not to φ<sub>TaCr</sub> (r = 0.11). For φ<sub>FoSo</sub> no significant differences were found between groups at 4 Nm. However, for SCP children the mean estimate of φ<sub>TaCr</sub> was 4.3° more towards plantar flexion compared to the TD group (p < 0.05). Normalized TS lengths show a higher coefficient of correlation with φ<sub>TaCr</sub> (r<sup>2</sup> = 0.82) than with φ<sub>FoSo</sub> (r<sup>2</sup> = 0.60), indicating that TS lengths are better estimated by talo-cural joint angles. In both SCP and TD children aged 6-13 year, estimates of TS length and extensibility based on foot sole assessments are confounded by foot flexibility. Assessments of TS extensibility at physical examination will be more accurate when based on measurements of talo-crural joint angles.
Medical subject headings
- Foot
- Muscle Spasticity
- Muscle, Skeletal
- Paresis
- Physical Examination