AP Axial Intercondylar Fossa Beclere is a radiography positioning projection of the Lower Extremity. Supine, knee flexed 60 degrees, CR 40 degrees cephalad. SID 40". The centering point is located intercondylar area with patient supine, knee flexed.. The central ray is 40 degrees cephalad, perpendicular to the long axis of the tibia.. Image-quality criteria include intercondylar eminence and notch clearly visualized., femoral condyles in direct axial projection.. 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 plane.
- Intercondylar fossa and notch.
- Femoral condyles in axial relationship.
- Tibial plateau with intercondylar topography.
- Anterior and posterior tibial spines.
- Intercondylar ridge.
Patient preparation
- Verify patient identity using two identifiers.
- Remove shoes and any radiopaque items from the leg.
- Position patient supine on table with knee extended initially.
- Flex affected knee and place foot on table or stool.
- Ensure hip and knee alignment for true axial view.
Position & centering point
Intercondylar area with patient supine, knee flexed.
Central ray
40 degrees cephalad, perpendicular to the long axis of the tibia.
Exposure / technique
- kVp
- 65–75
- mAs
- 5–10
- SID
- 40" (102 cm)
- Notes
- Beclere method with CR angled cephalad brings intercondylar notch into view.
Image-quality criteria
- Intercondylar eminence and notch clearly visualized.
- Femoral condyles in direct axial projection.
- Tibial plateau visible in axial plane.
- Anterior and posterior tibial spines differentiated.
- No foreshortening of intercondylar anatomy.
- Collimation 1 inch on sides, 1.5 inches proximal and distal.
Common errors / ARRT traps
- 1 Insufficient knee flexion results in poor intercondylar notch visualization.
- 2 Excessive flexion foreshortens the intercondylar area.
- 3 CR angle not appropriate to leg position distorts anatomy.
- 4 Lateral rotation of hip or knee rotates intercondylar view.
Clinical indications
- Intercondylar eminence fracture evaluation.
- Anterior and posterior tibial spine fracture assessment.
- Cruciate ligament origin and attachment point visualization.
- Intercondylar pathology detection in supine position.
Aligned to the 2025 ARRT Content Specifications.