Greenspan A, Norman A, Tchang F K
J Bone Joint Surg Am. 1977 Jun;59(4):483-5.
In the total examination of the knee, degenerative changes and ossification in the quadriceps tendon easily recognized on the lateral roentgenogram may cause confusion in diagnosis when seen on the axial view. Vertical ridging of the osteophytes at the patellar insertion of the quadriceps tendon can resemble dentate structure ("tooth" sign). Two hundred and fifty examinations of the knee in different age groups were reviewed and several anatomical sections of the quadriceps-patella insertion were studied. The "tooth" sign represents the relief of severe osteophyte formation in the bundle of the quadriceps tendon at its insertion into the patella.
在膝关节的全面检查中，在侧位X线片上容易识别的股四头肌肌腱的退行性改变和骨化，当在轴位片上看到时，可能会导致诊断混淆。股四头肌肌腱在髌骨附着处的骨赘垂直嵴可类似于齿状结构（“牙齿”征）。回顾了250例不同年龄组的膝关节检查，并研究了股四头肌-髌骨附着处的几个解剖切片。“牙齿”征代表股四头肌肌腱束在其插入髌骨处严重骨赘形成的缓解。
