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. 2010 Nov;90(11):1619–1630. doi: 10.2522/ptj.20090377

Figure 3.

Figure 3.

Prediction of isometric knee extensor peak torque from various vastus lateralis (VL) muscle thickness values for a representative 12-year-old child with cerebral palsy (CP) at Gross Motor Function Classification System (GMFCS) levels I through IV and for a representative 12-year-old child with typical development (TD). The equations are based on the VL muscle thickness predictive equations in Table 2 for the CP and TD groups; ISOM=isometric knee extensor peak torque (N·m), VLMT=VL muscle thickness (millimeters). For the CP group: ISOM=−7.6 + (3.0 × VLMT) + (3.0 × age) − (12.5 × GMFCS); for the TD group: ISOM=−79.7 + (6.2 × VLMT) + (5.9 × age).