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FIGURE 3.16. (A, B) The C sign. This term reflects the shape of the hand when a patient describes deep interior hip pain. The hand is cupped above the greater trochanter with the thumb posterior and the fingers gripping deep into the anterior groin.

source."4 Although this may ensure physiologic harmony among the various structures, it also explains why muscle spasms and cutaneous sensations may accompany joint irritation.

Classic mechanical hip pain is described as being anterior, typically emanating from the groin area. The hip joint receives innervation from branches of L2 to S1 of the lumbosacral plexus, predominantly L3 (Figure 3.14). Consequently, hip symptoms may be referred to the L3 dermatome, explaining the presence of symptoms referred to the anterior and medial thigh, distally to the level of the knee (Figure 3.15).

Intracapsular hip pathology almost always has a component of anterior hip pain. There may also be a

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Essentials of Human Physiology

Essentials of Human Physiology

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