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. 2019 Jul 5;12(3):260–270. doi: 10.1007/s12178-019-09564-4

Fig. 3.

Fig. 3

Illustration demonstrating the circle model of the hip joint. The top two illustrations depict a hip without a femoral cam lesion, which can go through full range of motion without impingement and subsequent subluxation. In the bottom illustration, an anterior cam lesion causes anterior hip impingement resulting in posterior subluxation and microinstability of the hip