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. 2003 Mar 7;548(Pt 3):971–981. doi: 10.1113/jphysiol.2002.035576

Figure 2. Sagittal-plane scans of the patella tendon (PT) at rest, during isometric contraction at 50 % of maximal and at maximal tendon force.

Figure 2

Arrows indicate displacement of the apex of the patella (P) during contraction with respect to an echo-absorptive external marker fixed on the skin.