观察髌股关节病患者，髌骨外倾角的大小范围对髌股关节病诊断的意义。

实验组收集年龄27～65岁，平均年龄(50±4)岁。临床上就诊于哈尔滨市第一医院骨科患者，不同程度的膝关节疼痛及屈伸活动受限，排除类风湿性关节炎，关节感染，关节外伤，符合髌股关节病诊断标准病例214例，共计214膝。拍摄X光下膝关节屈膝髌骨30°时轴位片，测量髌骨外倾角的大小。对照组收集年龄28～77岁，平均年龄(51±3)岁，无膝关节病及疼痛的病例60例，共计60膝，拍摄X光下膝关节屈膝髌骨30°时轴位片，测量髌骨外倾角的大小。

实验组测得髌骨外倾角在18.5°～35.2°之间，髌股关节病患者X光下膝关节屈膝髌骨30°时轴位片髌骨外倾角增大。对照组测得髌骨外倾角在7.7°～18.7°之间，X光下膝关节屈膝髌骨30°时轴位片髌骨外倾角在正常范围。

髌骨外倾角的测量对于髌股关节病的诊断有重要意义，X光下膝关节屈膝髌骨30°时轴位片见髌骨外倾角增大并伴有关节疼痛患者可以考虑髌股关节病诊断，可行关节镜手术治疗。

To observe the diagnostic significance of range of the patella tilting angle in patients with patellofemoral disease.

In the orthopedic department of the First Hospital of Harbin, 214 cases of 214 knees diagnosed as patellofemoral joint disease with knee pain and limited flexion activities were enrolled to the experimental group , among whom rheumatoid arthritis, joint infection or joint injury was excluded. The age of experimental group was from 27 to 65 years, with an average age of (50±4)years. The control group enrolled 60 cases of 60 knees without knee joint diseases or pain. The age of control group was 28 to 77 years, (51±3) years on average. X-ray image of knee-patella at 30 ° knee-flexion axial position was used to measuring the size of the patella tilting angle.

The patella tilting angle of the experimental group was between 18.5 ° and 35.2 °; the patella tilting angle increased at 30 ° knee-flexion axial position in X-ray image. The patella tilting angle of the control group was between 7.7 ° and 18.7 °, which was in the normal range.

Patella tilting angle measurement has important significance for patellofemoral joint disease diagnosis; when it increases at 30 ° knee-flexion axial position in X-ray with joint pain, the patient may be diagnosed joint disease and arthroscopic treatment can be performed.