Overview

The sunrise or skyline view images the patellofemoral joint with the knee flexed to visualize the patellar surface and trochlea. It is useful for detecting patellar subluxation and chondral lesions. Proper flexion angle optimizes visualization of the joint surface.

Technique

Flex the knee to the required angle and center the detector to the patella with the beam tangential to the patellofemoral joint. Use a small focal spot and immobilize the limb to reduce motion. Adjust exposure for the increased soft tissue thickness.

Clinical Indications

Sunrise view is indicated for anterior knee pain suspected patellar instability and chondral injury. It complements AP and lateral views for comprehensive knee assessment. MRI provides detailed cartilage evaluation when needed.

Image Assessment

Assess patellar alignment trochlear morphology and joint space narrowing. Look for osteochondral fragments and subluxation. Report findings relevant to surgical planning and rehabilitation.