OBJECTIVE To characterize the radiographic, CT, and MRI appearance of clinically and/or surgically proven osteochondral lesions of the lateral trochlear ridge. MATERIALS AND METHODS Ten years of medical charts with elbow radiographic, CT, and MRI studies were retrospectively reviewed. Patients with pathology isolated to the lateral trochlear ridge were included. Studies were reviewed by two radiologists. Identifiable pathology on each type of study was noted and characterized. RESULTS Ten elbow studies were included, all from males aged 15 to 58 years (mean 29 years). Five elbow radiographs were normal, one showed mixed lucency and sclerosis of the lateral trochlear ridge, and four demonstrated small osseous fragments adjacent to the ridge. In all cases, CT demonstrated focal lucency at the cortical surface of the lateral trochlear ridge; 8 contained small osseous fragments, axial plane maximum width ranged from 5 to11 mm, depth from 1 to 2 mm. Focal bone marrow edema in the subchondral lateral trochlear ridge was found in the 6 cases with MR images. Two demonstrated linear high signal underlying the in situ osseous fragment, faintly visible on MRI. In 9 cases, arthroscopy was performed within 3 months of imaging. The remaining patient was treated conservatively with casting. CONCLUSIONS Osteochondral lesions of the lateral trochlear ridge are rare but important, as these patients go on to arthroscopy at a high rate. If an abnormality of the lateral trochlear ridge is seen or suspected, we recommend CT as the best imaging study to define these lesions.

中文翻译：

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滑车外侧ridge的软骨软骨病变：肘部疼痛患者的高级影像学中罕见，微妙但重要的发现。

目的表征临床和/或手术证实的滑车外侧脊骨软骨病变的影像学，CT和MRI表现。材料与方法回顾性回顾了十年的医学图表，其中包括肘部X光，CT和MRI研究。病理隔离到滑车外侧脊的患者也包括在内。两名放射科医生对研究进行了审查。记录并表征了每种研究类型的可识别病理学。结果包括十项肘关节研究，全部来自年龄在15至58岁（平均29岁）的男性。5幅肘部X线照片正常，其中1幅显示滑车外侧脊混合透明和硬化，而4幅显示邻近脊的小骨碎片。在所有情况下，CT均显示出滑车外侧ridge皮质表面的局灶性透明性。8个包含小的骨碎片，轴向平面最大宽度为5至11毫米，深度为1至2毫米。MR影像检查发现6例软骨下外侧滑车脊有局灶性骨髓水肿。两个原位骨碎片下方显示了线性高信号，在MRI上微弱可见。在9例中，在影像学检查的3个月内进行了关节镜检查。其余患者采用铸件保守治疗。结论滑车外侧ridge的软骨膜病变很少见但很重要，因为这些患者接受关节镜检查的比率很高。如果发现或怀疑滑车外侧脊异常，我们建议将CT作为确定这些病变的最佳影像学检查。MR影像检查发现6例软骨下外侧滑车脊有局灶性骨髓水肿。两个原位骨碎片下方显示了线性高信号，在MRI上微弱可见。在9例中，在影像学检查的3个月内进行了关节镜检查。其余患者采用铸件保守治疗。结论滑车外侧的软骨膜病变很少见，但很重要，因为这些患者继续接受关节镜检查。如果发现或怀疑滑车外侧脊异常，我们建议将CT作为确定这些病变的最佳影像学检查。MR影像检查发现6例软骨下外侧滑车脊有局灶性骨髓水肿。两个原位骨碎片下方显示了线性高信号，在MRI上微弱可见。在9例中，在影像学检查的3个月内进行了关节镜检查。其余患者采用铸件保守治疗。结论滑车外侧的软骨膜病变很少见，但很重要，因为这些患者继续接受关节镜检查。如果发现或怀疑滑车外侧脊异常，我们建议将CT作为确定这些病变的最佳影像学检查。影像学检查后3个月内进行了关节镜检查。其余患者采用铸件保守治疗。结论滑车外侧的软骨膜病变很少见，但很重要，因为这些患者继续接受关节镜检查。如果发现或怀疑滑车外侧脊异常，我们建议将CT作为确定这些病变的最佳影像学检查。影像学检查后3个月内进行了关节镜检查。其余患者采用铸件保守治疗。结论滑车外侧的软骨膜病变很少见，但很重要，因为这些患者继续接受关节镜检查。如果发现或怀疑滑车外侧脊异常，我们建议将CT作为确定这些病变的最佳影像学检查。