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Knee radiographic positioning Keerthana knee[1].pptx
- 1. KNEE PRESENTER : KEERTHANAKRISHNAN C.P COURSE : BSc MIT 2nd YEAR MODERATOR : Mrs. SARANYA DATE: 06-04-2024
- 2. CONTENTS Anatomy KneePA axial Holmblad method Camp-Coventry method Knee AP axial Beclere method Stress projection
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- 5. PATIENT PREPARATION Askabout medical history Remove metal objects Wear proper clothing If patient is female ask about pregnancy
- 6. KNEE PA AXIAL INDICATIONS Patellar fractures Patellofemoral joint disorders Chronic knee pain Trauma CONTRAINDICATION Pregnancy
- 7. KNEE PA AXIAL (HOLMBLADMETHOD) PATIENT POSITIONING place the patient in one of three positions: 1. Standing with the affected knee flexed and resting on a stool at the side of radiographic table 2. Standing at the side of radiographic table with the affected knee flexed and placed in contact with front of the IR 3. Kneeling on the radiographic table with the affected knee over the IR
- 8. KNEE PA AXIAL (CAMP-COVENTRYMETHOD) PATIENT POSITIONING Place the patient in the prone position Flex the patients knee to either a 40 or 50 degree angle, and rest the foot on a suitable support Center the upper half of the IR to the knee joint ; the central ray angulation projects the joint to the centre of the IR Adjust the leg so that the knee has no medial or lateral rotation
- 9. KNEE PA AXIAL CENTRALRAY Perpendicular to the long axis of the leg, entering the knee joint ½ inch below the patellar apex COLLIMATION Collimation should be centered to the mid-knee joint area Includes the patellofemoral joint and the intercondylar area
- 10. KNEE PA AXIAL TECHNICALFACTORS Orientation : portrait IR size : 8x10 inch Exposure : 70-80 kVP, 15-20 mAs SID : 100cm Grid : No
- 11. KNEE PA AXIAL (HOLMBLADAND CAMP-COVENTRY METHOD) ESSENTIAL IMAGE CHARACTERISTICS Open fossa Posteroinferior surface of the femoral condyles Intercondylar eminance and knee joint space Medial and lateral intercondylar tubercles Apex of the patella not superimposing the fossa Soft tissue in the fossa and interspaces
- 12. KNEE AP AXIAL (BECLEREMETHOD) INDICATIONS Osteoarthritis Traumatic injuries Knee fracture Bone lesion and tumors CONTRAINDICATION Pregnancy
- 13. KNEE AP AXIAL PATIENTPOSITIONING Place the patient in the supine position Flex the affected knee enough to place the long axis of the femur at an angle of 60 degrees to the long axis of the tibia Support the knee on sandbags Place the IR under the knee, centered to the mid-knee joint area
- 14. KNEE AP AXIAL CENTRALRAY Perpendicular to the long axis of the leg, entering the knee joint half inch below the patellar apex COLLIMATION Superior to include the distal femur Inferior to include the proximal tibia or fibula Lateral to include the skin margin Medial to include the medial skin margin
- 15. KNEE AP AXIAL TECHNICALFACTORS Orientation :portrait IR size : 24x30 cm Exposure : 60-70 kVP, 7-10 mAs SID : 100cm Grid : no
- 16. KNEE AP AXIAL ESSENTIALIMAGE CHARACTERISTICS Open intercondylar fossa Posteroinferior surface of the femoral condyles Intercondylar eminance and knee joint space No superimposition of the fossa by the apex of patella Soft tissue in the fossa and interspaces
- 17. STRESS PROJECTION OFKNEE INDICATION Swelling or inflammation Subluxation due to the fracture of collataral ligaments Pain or discomfort in knee joint CONTRAINDICATION Pregnancy
- 18. STRESS PROJECTION OFKNEE PATIENT POSITIONING It is taken with the knee bent 15 degrees and the thigh is supported by a thigh rest The beam is angled parallel to the jointline, while either a valgus Or varus stress is produced
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- 20. STRESS PROJECTION OFKNEE CENTRAL RAY Apex of the patella COLLIMATION Superior to include the distal femur Inferior to include the proximal tibia or fibula
- 21. STRESS PROJECTION OFKNEE TECHNICAL FACTORS Orientation : portrait IR size : 24x30 cm Exposure : 60-70 kVP, 7-10 mAs SID : 100cm GRID : NO
- 22. STRESS PROJECTION OFKNEE ESSENTIAL IMAGE CHARACTERISTICS Thigh bone and shin bone Articular cartilage Medial and lateral menisci Ligaments Muscles and tendons
- 23. RADIATION PROTECTION Leadapron Eye goggle Gonad shield Thyroid shield Leg guard
- 24. REFERENCE Clarks positioningin radiography Merrills atlas Radiopaedia website
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