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Objective: This study of the femoral acetabular impingement syndrome (Femoroacetabular Impingement, FAI) of the various imaging (X-ray, CT and MR) indicators, signs and clinical characteristics of the image was discussed, aims to raise awareness of the disease clinically to confirm the diagnosis, so that early detection and early treatment. Method: 1. Study screened images that meet the definition of FAI hip 56 cases, a total of 54 patients, male 38, female 16, two male patients with bilateral disease, aged 18 to 78 years, mean 36.2 years All patients with hip, groin or buttock pain chief complaint of treatment, duration of 6 months to 30 years, and another selected 50 volunteers without symptomatic hip comparative study, observe normal hip various imaging indicators Performance. (2) At least line inspection methods studied X-ray, CT or MR three methods of two checks, X-ray imaging system using ordinary DR conventional double hip anteroposterior projection method, which requires consistent projection conditions; CT examination conventional axial scanning, and general coronal, oblique coronal, oblique axial reconstruction, CT machine is used in the German company Siemens Sensation Somatom 64-slice spiral CT scanner; MR examination using conventional FSE-T1WI, FSE-T < sub> 2 WI pressure grease coronal scan and FSE-T 1 WI, STIR-T 2 WI pressure grease axial scanning, partly based on FLASH-2D radial scanning method, all patients with the German company Siemens Symphony 1.5T superconducting MR scanner, scanning surface receiving coils. 3 Observation of indicators and analysis that meet the definition of hip FAI images for clinical analysis, including gender, age, duration, hip activity, etc., its X-ray, CT and MR is given a variety of common indicators measure the abnormal Imaging signs were classified studies include: the Ministry of femoral neck and acetabulum common measurement method, abnormal hip bone density and morphology observation acetabulum and femoral head bone and cartilage abnormal signal indicators and the specificity of the control group was observed, FAI group comparison between segments. 4 Statistical analysis on the FAI group and the control group for comparison analysis, the FAI group genotyping comparative analysis between the rational use of statistical methods, using a two sample t-test, paired t-test measurement data, four grid Table chi-square test and Fisher's exact test. By comparing the abnormal hip morphology and signs, to determine the meaning of the indicators. Results: All patients had short follow-FAI, the basic rule out the possibility of other diseases. Radiographic abnormalities of the hip majority of non-traumatic lesions of the femoral head aseptic necrosis, followed by inflammation, tuberculosis and traumatic arthritis, FAI that belong to the category of traumatic arthritis, but it is seen with normal acetabular malnutrition and trauma caused traumatic arthritis is different, it has its own corresponding theoretical basis and classification, and imaging findings were significantly different. In all 56 cases of hip, there are X-ray examination of 44 cases, CT examination 44 cases, MR examination 26 cases, which have X-ray and CT examination of 30 cases, with X-ray and MR examination of 12 cases with CT and MR examined 12 cases, 2 cases with X-ray, CT and MR three kinds of checks. 1 clinical indicators: hip hip activity is a measure of whether or not the most accurate motion normal standards, assess the range of joint movement dysfunction and extent of the indicators. In this study, the control group, 56 cases of hip FAI and control group 20 cases of hip joint, hip joint activity carried out (range of motion, ROM) measurements found in hip flexion, abduction of the ROM with the normal group significantly statistically significant, while in dorsiflexion position, adduction bit ROM is no significant statistical difference. 2.X-ray examination indicators: FAI group of 44 cases of hip anteroposterior film and the control group 50 cases of asymptomatic medical hip hip anteroposterior films were compared, respectively, the CE angle, Sharp angle, neck-shaft angle and acetabular index measurements, the results four indicators P values ??were greater than 0.05, so that the X-ray indicators FAI group and the control group had no significant difference. 3.CT check indicator: FAI hip group of 44 cases and a control group of 20 cases of hip were controlled, the measuring head acetabular index, the FAI group on the review of 10 cases of repetitive hip conducted research and found that normal coronary bit oblique coronal than repeatability slightly stronger, with the stability data relative, so the ordinary coronal position for the control standard. It also conducted a α angle, β angle and neck than the measured and found a significant statistical difference angle α. CT measurements also include signs of hip abnormalities image analysis, we found 44 cases of FAI hip, the acetabular rim sclerosis hyperplasia in 26 cases, loss of hip smooth surface and 132 cases under the limitations of the articular surface density anomaly in 18 cases, femoral bone edge superfluous or bony protrusion formed in 12 cases. 4.MR check MEASURES: FAI group of 26 cases of hip MR images were analyzed and summarized, in which the femoral head bone signal changes, 13 cases of acetabular bone signal changes in 14 cases, abnormal signals hip cartilage 13 cases, joint effusion in 21 cases, abnormal acetabular rim or lip 24 cases. MR detail to show the bone and cartilage lesions characteristic FAI further observation provides a clear basis for some of the hip joint can only use the MR examination to confirm the diagnosis. 5.FAI group were: FAI group of 56 hips, 44 cases of X-ray, CT, and 26 cases of 44 cases of MRI, according to whether the femoral head and neck or divided at the morphological abnormalities were divided into two groups, which will have the femoral head divided at the femoral neck or a group of morphological abnormalities named group C (cam group), the rest of the named group P (pincer group), on CT, X-line groups of CE angle, Sharp angle, neck shaft angle, head and acetabulum index, α angle, β angle and neck than for a comparison and found that CE angle, neck shaft angle, α angle significantly different. The CT and MR imaging abnormal signs were analyzed, in which the femoral head osteophytes, loss of hip surface is smooth, femoral bone signals acetabular bone signals were significantly different. Conclusion: This study is based on similar studies abroad, its imaging section are summarized and refined, with part of the data confirms the FAI imaging features, of which the oblique axial CT of the most characteristic angle α, while visually observed at the junction of the neck bony prominences, offset (divided at the normal femoral head and neck sag) disappears deep acetabulum phenomenon or MR demonstrated acetabular acetabular lip and traumatic change also has the characteristics of relative significance, so From the point of view of imaging diagnostic classification refinement of the FAI.
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