Proofread and insert the proper punctuation.

The x-rays revealed: an articular fracture of the tibia, a butterfly fracture of the fibula, and a longitudinal fracture of the femur.

Answer:
The x-rays revealed an articular fracture of the tibia, a butterfly fracture of the fibula, and a longitudinal fracture of the femur.

Because - The x-rays revealed (cannot stand alone)is not an idependent clause - so in this case the the list can be incorporated into one single sentence?

Yes, that's right. Good job.

Yes, you are correct. The initial phrase "The x-rays revealed" is not an independent clause because it cannot stand alone as a complete sentence. Therefore, it can be incorporated into a single sentence with the list of fractures by removing the colon and inserting a comma after the initial phrase. The revised sentence would be: "The x-rays revealed an articular fracture of the tibia, a butterfly fracture of the fibula, and a longitudinal fracture of the femur."