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Am J Sports Med. 2013 Jun;41(6):1357-62. doi: 10.1177/0363546513483448. Epub 2013 Apr 5.

Prevalence of increased alpha angles as a measure of cam-type femoroacetabular impingement in youth ice hockey players.

Author information

1
Steadman Philippon Research Institute, Attn: Center for Outcomes-based Orthopaedic Research, 181 West Meadow Drive, Suite 1000, Vail, CO 81657, USA. drphilippon@sprivail.org

Abstract

BACKGROUND:

It has been reported that relative to other sports participants, ice hockey players suffer from cam-type femoroacetabular impingement (FAI) in higher numbers. α angles have been reported to increase with the likelihood of symptomatic FAI. It is unclear how prevalent increased α angles, commonly associated with cam FAI, are in asymptomatic young ice hockey players.

HYPOTHESIS:

There would be a higher prevalence of α angles associated with cam FAI in youth ice hockey players than in a non-hockey-playing (skier) youth control group.

STUDY DESIGN:

Cohort study; Level of evidence, 3.

METHODS:

A total of 61 asymptomatic youth ice hockey players (aged 10-18 years) and 27 youth skiers (controls) (aged 10-18 years) underwent a clinical hip examination consisting of the flexion/abduction/external rotation (FABER) distance test, impingement testing, and measurement of hip internal rotation. The hip α angle was measured by magnetic resonance imaging, and labral tears and articular cartilage lesions were documented. Hockey players were grouped according to their USA Hockey classification as peewees (ages 10-12 years), bantams (ages 13-15 years), and midgets (ages 16-19 years).

RESULTS:

Overall, ice hockey players had significantly higher α angles than did the control group, and hockey players had a significant correlation between increased age and increased α angles, while the control group did not. In the ice hockey group, 75% had an α angle of ≥55°, while in the skier group, 42% had an α angle of ≥55° (P < .006). Hockey players were 4.5 times more likely to have an α angle commonly associated with cam impingement than skiers. Midget players had the highest risk of increased α angles.

CONCLUSION:

Even at young ages, ice hockey players have a greater prevalence of α angles associated with cam FAI than do skier-matched controls. Properties inherent to ice hockey likely enhance the development of a bony overgrowth on the femoral neck, leading to cam FAI.

KEYWORDS:

cam lesion; femoroacetabular impingement; ice hockey; magnetic resonance imaging; α angle

PMID:
23562808
DOI:
10.1177/0363546513483448
[Indexed for MEDLINE]

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