Female 51 years old; Reason: Evaluate for possible quad tendon vs patellar tendon rupture. Patient is status post total knee arthroplasty. The quadriceps tendon and patellar tendon appear intact. We see no findings to suggest a patellar fracture. The distal fibers of the vastus lateralis appear normal. There is edema superficial to the distal fibers of the vastus medialis obliquus, however the fibers appear intact. Additional edema is noted throughout the subcutaneous fat. A large joint effusion is present. A collection of fluid signal intensity is noted between the medial head of the gastrocnemius and popliteus muscle measuring approximately 2.5 cm in transverse dimension and extending inferiorly beyond the field of view of this study, perhaps representing an intermuscular hematoma. Additional intermuscular edema is present between the muscles of the upper calf. Given the aforementioned limitations, we seen no muscle tear.
1. Limited study due to metallic artifact from a total knee prosthesis. Given these limitations, the extensor mechanism appears intact.2. Large joint effusion and soft tissue edema as described above, as well as an elongated fluid collection in the posteromedial knee which may represent an intermuscular hematoma.