Abstract：
OBJECTIVE: To compare pre- and postoperative findings between patients undergoing hip arthroscopy for femoroacetabular impingement syndrome with lateral impingement versus those without lateral impingement METHODS: Patients who underwent primary hip arthroscopy for femoroacetabular impingement syndrome between 2012 and 2017 with minimum 5-year follow-up were included. Alpha angle (AA) was measured on preoperative anteroposterior (AP) and 90° Dunn radiographs. Patients with AA >60° on Dunn view but not AP view (no lateral impingement) were propensity matched by sex, age, and body mass index in a 1:3 ratio to patients with AA >60° on both views (lateral impingement). Demographic characteristics, radiographic and intraoperative findings, reoperation rates, and patient-reported outcomes (PROs) were compared between groups. Categorical variables were compared using the Fisher exact testing and continuous variable using 2-tailed Student t tests.
RESULTS: Sixty patients with lateral impingement (65.0% female, age: 35.3 ± 13.0 years) were matched to 180 patients without lateral impingement (65.0% female, age: 34.7 ± 12.5 years, P ≥ .279). Patients with lateral impingement had larger preoperative AAs on both Dunn (71.0° ± 8.8° vs 67.6° ± 6.1°, P = .001) and AP radiographs (79.0° ± 12.1° vs 48.2° ± 6.5°, P < .001). However, there were no differences in postoperative AAs on either view (Dunn: 39.0° ± 6.1° vs 40.5° ± 5.3°, AP: 45.8° ± 9.0° vs 44.9° ± 7.0°, P ≥ .074). Labral tears began more superiorly in patients with lateral impingement (12:00 ± 0:49 vs 12:17 ± 0:41, P = .030), and they demonstrated greater rates of acetabular and femoral cartilage damage (P = .030 for both); however, there were no differences in PROs or reoperation rates between the groups at 5-year follow-up.
CONCLUSIONS: Although cam deformities located laterally and anterolaterally are larger than those located anterolaterally alone, both can be resected adequately, resulting in similar postoperative radiographic measurements, PROs, and survivorship.
METHODS: Level III, retrospective cohort study.
RESULTS: Sixty patients with lateral impingement (65.0% female, age: 35.3 ± 13.0 years) were matched to 180 patients without lateral impingement (65.0% female, age: 34.7 ± 12.5 years, P ≥ .279). Patients with lateral impingement had larger preoperative AAs on both Dunn (71.0° ± 8.8° vs 67.6° ± 6.1°, P = .001) and AP radiographs (79.0° ± 12.1° vs 48.2° ± 6.5°, P < .001). However, there were no differences in postoperative AAs on either view (Dunn: 39.0° ± 6.1° vs 40.5° ± 5.3°, AP: 45.8° ± 9.0° vs 44.9° ± 7.0°, P ≥ .074). Labral tears began more superiorly in patients with lateral impingement (12:00 ± 0:49 vs 12:17 ± 0:41, P = .030), and they demonstrated greater rates of acetabular and femoral cartilage damage (P = .030 for both); however, there were no differences in PROs or reoperation rates between the groups at 5-year follow-up.
CONCLUSIONS: Although cam deformities located laterally and anterolaterally are larger than those located anterolaterally alone, both can be resected adequately, resulting in similar postoperative radiographic measurements, PROs, and survivorship.
METHODS: Level III, retrospective cohort study.
摘要：
目的：比较进行髋关节镜检查的股骨髋臼撞击综合征（FAIS）患者的术前和术后发现外侧撞击与没有外侧撞击的患者。在术前AP和90°DunnX光片上测量α角（AA）。在Dunn视图上AA>60°但非AP视图（无侧向撞击）的患者倾向与性别匹配。年龄,在两个视图（侧向撞击）上，与AA>60°的患者的BMI为1：3。人口特征，放射学和术中发现，再操作率,和患者报告的结果（PRO）进行了组间比较。使用双尾学生t检验比较分类变量和连续变量。
结果：60例外侧撞击患者（65.0％为女性，年龄：35.3±13.0岁）与180例无侧撞击患者（65.0％为女性，年龄：34.7±12.5岁，p≥0.279)。侧方撞击患者术前AAs均较大(71.0°±8.8°vs.67.6°±6.1°,p=0.001）和AP射线照片（79.0°±12.1°vs.48.2°±6.5°,p<0.001)。然而,两种观点的术后AAs均无差异（Dunn：39.0°±6.1°vs.40.5°±5.3°,AP:45.8°±9.0°vs.44.9°±7.0°,p≥0.074)。外侧撞击患者的唇膜撕裂开始更为优越（12:00±0:49vs.12:17±0:41，p=0.030），并且它们显示出更高的髋臼和股骨软骨损伤率（两者p=0.030）；然而，5年随访时,两组间的PRO或再手术率无差异.
结论：尽管位于侧方和前侧方的凸轮畸形大于仅位于前侧方的凸轮畸形，两者都可以充分切除，导致类似的术后射线照相测量，PROs,和生存。
结果：60例外侧撞击患者（65.0％为女性，年龄：35.3±13.0岁）与180例无侧撞击患者（65.0％为女性，年龄：34.7±12.5岁，p≥0.279)。侧方撞击患者术前AAs均较大(71.0°±8.8°vs.67.6°±6.1°,p=0.001）和AP射线照片（79.0°±12.1°vs.48.2°±6.5°,p<0.001)。然而,两种观点的术后AAs均无差异（Dunn：39.0°±6.1°vs.40.5°±5.3°,AP:45.8°±9.0°vs.44.9°±7.0°,p≥0.074)。外侧撞击患者的唇膜撕裂开始更为优越（12:00±0:49vs.12:17±0:41，p=0.030），并且它们显示出更高的髋臼和股骨软骨损伤率（两者p=0.030）；然而，5年随访时,两组间的PRO或再手术率无差异.
结论：尽管位于侧方和前侧方的凸轮畸形大于仅位于前侧方的凸轮畸形，两者都可以充分切除，导致类似的术后射线照相测量，PROs,和生存。
