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Published byBernadette Norton Modified over 9 years ago
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Standard Knee Series AP Knee Lateral Knee Tunnel Knee
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AP Knee pt is positioned with 15 o of internal rotation of the foot femorotibial joint spaces should measure between 5- 11 mm
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Lateral Knee approximately 30-35 degrees of flexion of the knee
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Blumensaat’s line Dense white line representing the surface of the intercondylar notch that is tangential to the x-ray beam.
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Ludloff’s Patch distal femoral epiphysi sA lucency in the distal femoral epiphysi s best seen around the age of 16 years
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3 year male The ossification center for the patella is first apparent. years of agenormal patellar ossification does not begin until 1.5-5 years of age
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The patellar ossification center is more prominent, and a normal pronounced indentation is evident at the anterior portion of the tibia at the eventual site of the tibial tubercle. 5 year male
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Patellar Position Patella AltaPatella Alta - patellar ligament greater than 20% longer than the patella Patella BajaPatella Baja - patella positioned too low the greatest length of the patella and the length of the patellar tendon (ligament) should be equal (20% variation is acceptable)
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Tunnel Knee approximately 45 o of knee flexion and a 45 o caudad tube tilt
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Accessory Projections
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Tangential Patella aka Sunrise Patellaaka Sunrise Patella lateral vs medial patellofemoral joint space Lateral Medial
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Bilateral AP Weightbearing Knees
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Oblique Knee
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Normal Variants of the Knee
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Patella agenesis Rare. Usually associated with hereditary osteo- onychodysostosis.
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Nail Patella Syndrome AKA Fong’s Syndrome, HOOD syndrome hypoplastic or absent patella nail abnormalities may see kidney dysfunction and webbing of the elbow iliac hornsiliac horns elbow abnormalitieselbow abnormalities
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Harris Lines Growth Arrest Linesaka Growth Arrest Lines represents areas of growth arrest resolution
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Bipartite Patella bilateral 80% of the time
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Tripartite Patella
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Os Cyamella popliteus tendonaccessory ossicle in the popliteus tendon
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Os Fabella lateral head of the gastrocnemiu s musclesesamoid bone located within the tendon of the lateral head of the gastrocnemiu s muscle bilateral in 2/3 to 3/4 of individuals
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Dorsal defect of the patella Variant in ossification. Circular radiolucent defect in superolateral pole of patella. May simulate neoplasm. May be related to bipartite patella.
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Self limiting. Incidental finding in children.
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Osgood- Schlatter’s Disease m/c in males 11 - 15 years of age fragmentation of the tibial tuberosity
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Sinding-Larsen- Johannsen Syndrome inferior pole of the patella
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Pellegrini- Steida medial collateral ligamentcalcification of the medial collateral ligament usually follows previous trauma
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Name the Anomaly/Line
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Name this Normal Appearance
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Name the Line
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Name the Variant
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Name the Anomaly
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