Knee Extension Norms Isometric quadriceps strength at 90°

Knee extension strength compared with reference values from healthy adults

Isometric measurement with the knee at 90°: % of predicted and z-score against the lower limit of normal for three published reference equations.

1

Patient

Sex
yr
cm
kg
kg
2

Measurement

Side testedFor Hogrel et al. 2007
kg
Unit
cm

Result

Shaded zone: below the lower limit of normal (LLN, 5th percentile of healthy adults, z < −1.645). z = (measured − predicted) / residual SD of each equation.

Show values as a table
ReferencePredictedLLNMeasured% pred.zNotes

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Reference equations

All three protocols test the knee at 90° of flexion. A result is only interpretable against a reference whose position, setup and trial selection match the measurement protocol.