TABLE 1.
OSD Classification of De Flaviis et al4
| Classification | Description |
|---|---|
| Type 1: cartilage swelling alone | Hypoechoic zone superficial to the apophysis of the anterior tibial tubercle representing pretibial cartilaginous swelling with forward displacement of the subcutaneous tissues and elevation of the patellar tendon from the tibial outline on the longitudinal view |
| Type 2: cartilage swelling and bony changes | A fragmented and hypoechoic ossification center in addition to the abovementioned findings |
| Type 3: associated tendinitis | Diffuse thickening of the insertion of the patellar tendon with or without vacuolation |
| Type 4: associated bursitis | Fluid collection in the retrotendineal soft tissue representing infrapatellar bursitis |