PA Axial Intercondylar Fossa Camp-Coventry is a radiography positioning projection of the Lower Extremity. Prone, knee flexed 40-50 degrees, CR 40-50 degrees caudad. SID 40". The centering point is located intercondylar notch with patient prone and knee flexed 40-50 degrees.. The central ray is 40-50 degrees caudad perpendicular to lower leg.. Image-quality criteria include intercondylar eminence clearly visualized in axial view., intercondylar notch open with minimal foreshortening.. Standard exposure ranges from 65 to 75 kVp, 5 to 10 mAs, at an SID of 40 inches (102 cm).
Anatomy demonstrated
- Intercondylar eminence in axial projection.
- Intercondylar fossa and notch.
- Femoral condyles in direct profile.
- Tibial plateau in axial relationship.
- Anterior and posterior tibial spines.
- Attachment sites for cruciate ligaments.
Patient preparation
- Verify patient identity using two identifiers.
- Remove shoes and any radiopaque items from the leg.
- Position patient prone on table with leg extended initially.
- Flex affected knee 40 to 50 degrees, place foot on table.
- Ensure pelvis is level and not rotated.
Position & centering point
Intercondylar notch with patient prone and knee flexed 40-50 degrees.
Central ray
40-50 degrees caudad perpendicular to lower leg.
Exposure / technique
- kVp
- 65–75
- mAs
- 5–10
- SID
- 40" (102 cm)
- Notes
- CR angle matches knee flexion (40-50°) so beam is perpendicular to the lower leg.
Image-quality criteria
- Intercondylar eminence clearly visualized in axial view.
- Intercondylar notch open with minimal foreshortening.
- Femoral condyles in profile showing both anterior and posterior.
- Tibial plateau included in axial projection.
- Anterior and posterior tibial spines differentiated.
- Collimation 1.5 inches on all sides around knee area.
Common errors / ARRT traps
- 1 Knee flexion angle less than 40 degrees results in foreshortening.
- 2 Flexion greater than 50 degrees closes intercondylar notch.
- 3 CR not perpendicular to lower leg distorts intercondylar anatomy.
- 4 Pelvis rotation tilts knee alignment.
Clinical indications
- Intercondylar eminence and tibial spine fracture assessment.
- Evaluation of anterior cruciate ligament origin.
- Posterior cruciate ligament attachment visualization.
- Intercondylar fossa loose body detection.
Aligned to the 2025 ARRT Content Specifications.