Abstract
BackgroundWe aimed to search whether alpha angle, a radiological clue used in the diagnosis of femoroacetabular impingement, is correlated with the presence of hip pain, internal rotation angle, and impingement test results on hip impingement patients (CAM type).MethodsMedical records of 334 patients (156 women, 178 men) with an average age of 33.8 ± 8.4 (range 20–50) years were retrospectively studied for the alpha angle of the hip measured on magnetic resonance images (MRI). Hip pain and internal rotation angles as well as results of impingement tests were reviewed.ResultsHip pain was reported more frequently on the right side (n = 35, 10.5%) compared to the left side (n = 22, 6.6%) (p = 0.047). No difference was observed between the right and left sides regarding alpha angles (p = 0.145), internal rotation angles (p = 0.637), or positivity of impingement test (p = 0.210). Internal rotation angles were significantly higher in cases without hip pain (p < 0.001) and in patients with negative impingement test result (p < 0.001). Internal rotation angle correlated positively with age and negatively with the alpha angle. Alpha angle was increased in cases that report pain, those with an internal rotation angle <20°, or cases with positive impingement test. The pain was more common, internal rotation angle was higher, and positivity for impingement was more frequent if the alpha angle was <55°. Patients with hip pain or positive impingement test or internal rotation angle <20° had increased alpha angles (p < 0.001).ConclusionsThe pain, impingement test results, and internal rotation angle seem to be associated with alpha angle of the hip measured on MRI in hip impingement patients.
Highlights
We aimed to search whether alpha angle, a radiological clue used in the diagnosis of femoroacetabular impingement, is correlated with the presence of hip pain, internal rotation angle, and impingement test results on hip impingement patients (CAM type)
The aim of the present study was to determine the factors affecting hip pain, internal rotation angle, alpha angle, and impingement test results and to investigate a correlation between alpha angle and these parameters in Femoroacetabular impingement (FAI) patients (CAM type). Study design This retrospective study was implemented to study the relationship between impingement test, hip alpha angle, and hip pain for 3 months by using data derived from the medical files of 378 FAI patients admitted to the orthopedics and traumatology department of our tertiary care center and had hip magnetic resonance images (MRI) examination
The purpose of the present study was to determine whether alpha angle was correlated with the presence of hip pain, internal rotation angle, and impingement test results in FAI patients (CAM type)
Summary
We aimed to search whether alpha angle, a radiological clue used in the diagnosis of femoroacetabular impingement, is correlated with the presence of hip pain, internal rotation angle, and impingement test results on hip impingement patients (CAM type). A certain amount of idiopathic hip arthritis cases may be linked with FAI [1] This pathology may occur due to bone abnormalities caused by overcoverage of the acetabulum (pincer type), asphericity of the femoral head and neck (cam type), or a combination of these conditions [2]. The alpha angle is defined by Nötzli et al to evaluate the asphericity of the head of the femur in magnetic resonance image (MRI) views [4]. It allows the assessment of the contour deformity of the femoral headneck junction and may aid in setting the guidelines for treatment [5]. Early diagnosis is important, misdiagnosis by clinicians unfamiliar with the disease is not
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