Assessment of the alpha angle and mobility of the hip in patients with noncontact anterior cruciate ligament injury

Purpose To evaluate the alpha angle of the hip in patients with noncontact anterior cruciate ligament (ACL) injury and compare it with patients without injury. In addition, external and internal rotation of the hip was assessed and correlated with the alpha angle. Methods The alpha angle of the ipsi...

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Bibliographic Details
Published in:	International orthopaedics Vol. 41; no. 8; pp. 1601 - 1605
Main Authors:	Lopes, Osmar Valadao, Tragnago, Gustavo, Gatelli, Cristiano, Costa, Rogério Nascimento, de Freitas Spinelli, Leandro, Saggin, Paulo Renato Fernandes, Kuhn, André
Format:	Journal Article
Language:	English
Published:	Berlin/Heidelberg Springer Berlin Heidelberg 01-08-2017
Subjects:	Anterior Cruciate Ligament Injuries - diagnostic imaging Anterior Cruciate Ligament Injuries - physiopathology Athletic Injuries - diagnostic imaging Athletic Injuries - physiopathology Biomechanical Phenomena Hip Joint - diagnostic imaging Hip Joint - physiopathology Humans Medicine Medicine & Public Health Original Paper Orthopedics Range of Motion, Articular Risk Factors Rotation Rupture Alpha angle Range of motion Anterior cruciate ligament tear (ACL) Hip
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Summary:	Purpose To evaluate the alpha angle of the hip in patients with noncontact anterior cruciate ligament (ACL) injury and compare it with patients without injury. In addition, external and internal rotation of the hip was assessed and correlated with the alpha angle. Methods The alpha angle of the ipsilateral hip was assessed in 41 subjects with non-contact ACL tear and compared with 39 subjects with no tear. The external and internal rotation of the ipsilateral hip was also evaluated. Results The alpha angle was larger in subjects with noncontact ACL injury. The mean was 70.31° (±13.92°) compared with 58.55° (±13.95°) in the control group ( p < 0.001). The groups were similar when considering the external, internal, and sum of rotation of the ipsilateral hip. There was no correlation between the alpha angle and decreased rotational range of motion of the hip in either group ( p > 0.05). Conclusion Patients with noncontact ACL injury presented a greater alpha angle when compared with the group without tear. There was no difference in the rotational mobility of the hip between groups, nor was there a correlation between the increase in the alpha angle and the decrease in the rotational mobility of the hip.
Bibliography:	ObjectType-Article-1 SourceType-Scholarly Journals-1 ObjectType-Feature-2 content type line 23
ISSN:	0341-2695 1432-5195
DOI:	10.1007/s00264-017-3482-6