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Abstract Objective To study the value of CT scanning in 30°-flexed knee in diagnosis of patellar femoral joint degeneration.Methods From January 2012 to June 2014，66 patients with patellar femoral joint degeneration was collected in clinic and whose knee was scanned with CT at 20° and 30° flexion alternatively.The patellar lateral tilt angle (PLTA)and congruence angle(CA) was measured and compared.Fifteen voluteers without patellar femoral joint degeneration were collected as the control group whose knee was scanned and measured in the same way.The extent of pain in patients with patellar femoral joint disease was messured with visual analogue scale and its corraltion to PLTA and CA were analyzed.Results In control group，PLTA was (15.56±3.63)° in knee with 30 degree flexion and (17.34±4.33)° in knee with 20 degree flexion and there was no significant difference，CA of five persons was more than 0°with 20°flexation and none was more than 0°with 30°flexation.In patient group，PLTA was (11.84±5.82)° in 30°-flexed knee and (12.83±5.12)° in 20°-flexed knee and there was no significant difference between twogroup.CA of 51 persons was more than 0°in 20°-flexed knee and 35 was more than 0°in 30°-flexed knee，there was significant difference between two flexed angle for CA.There was significant difference in PLTA between two groups in 30°flexed knee and in 20°-flexedknee.In patients group，there are four types of patellar femoral joint alignment，there are 15patients in type I whose PLTA<12° and CA<0°，and whose PLTA was (9.47±3.61)°；there are 26 patients in type Ⅱ whose PLTA<12° and CA>0°，and whose PLTA was (6.78±4.93)°；there are 9 patients in type Ⅲ whose PLTA>12° and CA>0°，and whose PLTA was (15.89±4.26)°；there are 16 patients in type Ⅳ whose PLTA>12° and CA<0°，and whose PLTA was(17.87±2.73)°.Conclusion For patients older than 40 years，PLTA<12° has great value in diagnosing the patients with patellar femoral joint disease when measured in 30°-flexed knee.
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