Figure 1.

Passive hip abduction with knee flexed over the edge of the plinth test.

Starting Position (Figure 1a):

The subject lies supine on the plinth with the contralateral leg hangs off the side of the plinth and the tested leg extended and placed on the plinth as shown (1).

Goniometer placement process:

The tester places one goniometer arm joining both anterior‐superior iliac spines and the other arm is placed over the anterior face of the tested limb following its bisector line, as shown (2).

Testing movement (Figure 1b):

The assistant tester performs a slow and progressively hip abduction movement with knee extended (neutral position “0”), as shown (3).

Stabilization:

The assistant tester must avoid rotation of the lower limb. The contralateral extremity (non‐tested) is fixed to the plinth by flexion of the knee to approximately 90° as shown (4).

Measurement:

The tester reads and records the abduction measurement angle formed by the two goniometer arms, in this case 16° as shown (5).

Notes: There are some compensatory movements that must be taken into account: Lateral inclination of the contralateral pelvis, the extension of the contralateral knee, and/or the rotation of the tested limb.