PURPOSE Infrapatellar fat pad (IPFP) syndrome and medial patellar plica (MPP) syndrome are two recognized causes of anterior knee pain. However, diagnosing these syndromes is challenging without arthroscopic examination. The aim of this study was to evaluate sagittal patellar tilt in patients with IPFP syndrome or MPP syndrome by measuring the patella-patellar tendon angle (PPTA) in affected patients. METHODS Eighty-three patients with anterior knee pain who underwent diagnostic arthroscopy that confirmed isolated IPFP or MPP syndrome from 2011 to 2016 were included in this retrospective study. Patients were divided into Group A (IPFP syndrome, n = 44) and Group B (MPP syndrome, n = 39). The control group included 78 patients without knee pathology who underwent magnetic resonance imaging (MRI) of the knee during the study period. Radiographic measurements, including PPTA, IPFP area, patellar height, axial patellar alignment, patellar tilt, sulcus angle, and lateral trochlear inclination, were made on MRI images by two experienced sports medicine orthopedists. RESULTS The mean PPTA in each knee-pathology group was significantly smaller than that in the control group (Group A: 137.3° ± 4.9°; Group B: 138.1° ± 3.2°; control group, 141.4° ± 2.9°). There was no significant difference between groups for any other radiographic parameter evaluated. CONCLUSION The PPTA was significantly smaller in patients with IPFP syndrome or MPP syndrome than in healthy controls. Therefore, sagittal patellar tilt should be included in the routine evaluation of patients with anterior knee pain. Evaluation of PPTA may help to diagnose IPFP syndrome or MPP syndrome. LEVEL OF EVIDENCE Level IV.

中文翻译：

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患有in下脂肪垫综合征和内侧pa骨pl肌综合征的患者的骨-pat腱角度减小。

目的In下脂肪垫（IPFP）综合征和media骨内侧（肌（MPP）综合征是公认的膝前疼痛的原因。然而，不进行关节镜检查就很难诊断这些综合征。这项研究的目的是通过测量患病患者的the骨-pat腱角度（PPTA）来评估IPFP综合征或MPP综合征患者的矢状pa骨倾斜度。方法这项回顾性研究纳入了2011年至2016年经诊断性关节镜检查确诊为IPFP或MPP综合征的83例前膝关节疼痛患者。将患者分为A组（IPFP综合征，n = 44）和B组（MPP综合征，n = 39）。对照组包括78名无膝关节病变的患者，他们在研究期间接受了膝盖的磁共振成像（MRI）检查。两名经验丰富的运动医学骨科医师在MRI图像上进行了放射线照相测量，包括PPTA，IPFP面积，pa骨高度，轴向axial骨对齐，pa骨倾斜度，沟角和侧滑车倾斜度。结果每个膝关节病理学组的平均PPTA均显着小于对照组（A组：137.3°±4.9°； B组：138.1°±3.2°；对照组141.4°±2.9°）。对于其他评估的放射学参数，两组之间无显着差异。结论IPFP综合征或MPP综合征患者的PPTA显着小于健康对照组。因此，对膝前疼痛患者的常规评估应包括矢状pa骨倾斜。评估PPTA可能有助于诊断IPFP综合征或MPP综合征。证据级别IV。