E1079. A Low Pelvic Incidence Angle May Not Place Young Athletes at Risk of Developing Cam Morphological Changes in the Hip Joint
  1. Wisam Witwit; Sahlgrenska University Hospital, University of Gothenburg; St. Joseph Mercy Oakland
  2. Adad Baranto; Sahlgrenska University Hospital, University of Gothenburg
Femoroacetabular impingement syndrome (FAI) has been shown to be common in young athletes. It has been hypothesized that the spino-pelvic complex may lead to the development of FAI. The purpose of the present study is to investigate the relationship between the Pelvic Incidence angle (PI) and the cam morphology (a-angle >55°) in young elite alpine skiers compared with a non-athletic control group.

Materials and Methods:
The sample group (n=102), mean age 18 (±1.5) years, consisted of elite alpine skiers (n=75) and non-athletes (n=27). Hip joints were examined for the cam morphology (a-angle >55°) with Magnetic Resonance Imaging (MRI) and PI measured from standing lateral plain radiographs.

Skiers had a significantly greater prevalence of cam morphology (49%, n=31) compared to the controls (19%, n=5, P=0.009). No correlation was shown between a low PI and cam (a-angle >55°) in both groups. Greatest frequency of the cam morphology was shown at 1 o´clock position for skiers' right (30%) and left (35%) hip compared to the controls (right: 8%; left: 4%). Mean values of a-angle at 1 o’clock for the skiers were 52° (±6.1) compared with the controls 48° (±4.6, P<0.001). There was no difference in mean PI between skiers (51°±12.3°) and controls (50°±9.8°).

The present study questions the significance of low PI as a risk factor associated with the predisposition of hip joint to cam morphological changes in young elite alpine skiers. Overloading the hips and repetitive micro-trauma are thought to be superior factors.