The contour of the femoral head-neck junction as a predictor for the risk of anterior impingement.
نویسندگان
چکیده
Impingement by prominence at the femoral head-neck junction on the anterior acetabular rim may cause early osteoarthritis. Our aim was to develop a simple method to describe concavity at this junction, and then to test it by its ability to distinguish quantitatively a group of patients with clinical evidence of impingement from asymptomatic individuals who had normal hips on examination. MR scans of 39 patients with groin pain, decreased internal rotation and a positive impingement test were compared with those of 35 asymptomatic control subjects. The waist of the femoral head-neck junction was identified on tilted axial MR scans passing through the centre of the head. The anterior margin of the waist of the femoral neck was defined and measured by an angle (alpha). In addition, the width of the femoral head-neck junction was measured at two sites. Repeated measurements showed good reproducibility among four observers. The angle alpha averaged 74.0 degrees for the patients and 42.0 degrees for the control group (p < 0.001). Significant differences were also found between the patient and control groups for the scaled width of the femoral neck at both sites. Using standardised MRI, the symptomatic hips of patients who have impingement have significantly less concavity at the femoral head-neck junction than do normal hips. This test may be of value in patients with loss of internal rotation for which a cause is not found.
منابع مشابه
پارامترهای آناتومیک مفصل هیپ و ارتباط آنها با پارامترهای فیزیکی بدن
Background and Objective: Arthrosis of the hip joint is one of the most common complications of patients and many efforts have been made to find its etiology. One of the subjects important for researchers is morphologic parameters of the hip joint and its relationship with osteoarthritis of this joint. Since these parameters themselves are affected by physical parameters of the body and the rac...
متن کاملThree-dimensional computed tomography of the hip in the assessment of femoroacetabular impingement.
Femoroacetabular impingement secondary to the cam effect is thought to be associated with an insufficient anterior concavity in the sagittal/axial plane of the femoral head-neck junction. Using three-dimensional computed tomography the anterior and posterior concavity of the femoral head-neck junction was assessed in 36 painful non-dysplastic hips (30 patients). The mean age of the symptomatic ...
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PURPOSE The purposes of this study were to assess the presence of cam and pincer morphology in asymptomatic individuals with a negative femoroacetabular impingement test, and to determine and compare the ranges of alpha angle using two measurement methods. MATERIALS AND METHODS In total, 68 consecutive patients who underwent abdominopelvic computed tomography (CT) for reasons other than hip p...
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BACKGROUND Femoroacetabular impingement as a result of slipped capital femoral epiphysis (SCFE) has been treated traditionally with a proximal femoral osteotomy, but open and arthroscopic femoral osteoplasty is becoming increasingly popular. Cam lesions result from excess bone primarily at the anterolateral femoral head-neck junction. SCFEs result from posterior and inferior slippage of the fem...
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Introduction: Osteochondroplasty of the anterior head-neck junction is often performed to treat femoro-acetabular impingement (FAI) on the assumption that the underlying deformity is inadequate anterior offset of the femoral head. However, other morphologic abnormalities, including reduced anteversion, posterior slip, and widening of the neck can all cause loss of joint motion. In this study we...
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ورودعنوان ژورنال:
- The Journal of bone and joint surgery. British volume
دوره 84 4 شماره
صفحات -
تاریخ انتشار 2002