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40 Cards in this Set
- Front
- Back
standard lumbar xray views
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AP
lateral (flexion, extension) right posterior oblique (to show the right facet and pars, and the LEFT SIJ) left posterior oblique (to show the left facet and pars, and the right SIJ) lumbar L5-S1 spot shot |
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what is the lumbar AP xray reading process
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1. Identify T12 by finding the last rib and count down to sacrum
2. Trace the vertebral body for shape and color 3. Find the pedicles “eyes” at each level 4. Trace the spinous processes “nose” at each level 5. Trace the transverse processes “ears” at each level 6. Observe the disc spaces for size and color 7. Trace the sides of the vertebral bodies looking for bone spurs 8. Observe the soft tissues from the ribs to the iliac crest |
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what is the lateral lumbar X ray reading process
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1. Trace the anterior edge of the vertebral bodies looking for bone spurs
2. Trace the individual vertebral bodies for shape and color 3. Observe the disc spaces for height and color 4. Trace the posterior edge of the vertebral bodies looking for slippage, ligament calcification or osteophytes (bone spurs) 5. Observe the pedicles 6. Observe facets for density and position 7. Trace the IVF’s 8. Trace the spinous process 9. Observe the soft tissue |
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what is the lumbar flexion extension xray reading process
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1. Trace the anterior and posterior vertebral body lines looking for slippage
2. Look for symmetrical motion at each level |
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what is the lumbar oblique xray reading process
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1. Trace the Scotty dog at each level
2. Look for radiolucent line through the pars “neck” 3. Observe the facets |
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what is the L5-S1 spot shot X ray reading process
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These should be read with the same process listed above for the lateral and A/P films.
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what is spondylosis
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Non-uniform loss of joint space, osteophytes, subchondral sclerosis (hardening of the bone making it more radiodense/whiter on the x-ray), deformity and subluxation are the 5 general radiologic features of DJD.
Only two joint complexes in the lumbar spine undergo degenerative changes: the facet joints and the intervertebral discs. An interruption of the pars interarticularis that may be unilateral or bilateral A radiolucent defect in the pars interarticularis is visualized optimally on oblique and lateral lumbar radiographs Referred to as the collar or broken neck of the “Scotty Dog” Etiology - Congenital, fatigue fracture, degenerative, traumatic |
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where is the most common location of DJD
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L4-L5
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what is DDD
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degenerative disc disease
The major radiographic signs of disc degeneration include decrease in disc height, osteophyte formation, endplate sclerosis and subluxation. Lateral films are the most helpful for identifying disc degeneration. |
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what is spondylolisthesis
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An anterior displacement of a vertebral body in relation to the segment below
90% of all cases involve the fifth lumbar vertebrae Normal: vertebral body corner aligns with sacral base corner. |
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what is ankylosing spondylitis
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A chronic inflammatory disorder, predominately affecting younger males, which distinctively involves the axial skeleton
Age of onset is usually between 15 and 35 years of age (average of 26) Characterized by: Articular bony ankylosis (stiffening and fusing of bone), ligament ossification Sacroiliac involvement is the hallmark of AS Pseudowidening of the joint space Loss of the articular cortical bone Erosive and sclerotic changes Irregular joint margins Ankylosis Spinal changes occur at the discovertebral junction, facet and costovertebral joints The outer fibers of the annulus fibrosis and its attachment to the vertebral body undergo segmental ankylosis by the formation of syndesmophytes (ossification within ligamentous tissue) Early ossification will show up as a “shiny corner sign” When multiple segments are ankylosed by symmetric marginal syndesmophytes, the continuous undulating spinal contour is termed the bamboo spine |
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signal intensity of the vertebral body in lumbar spine? discs? ligaments? SC and CSF?
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T1 image, the vertebral body will image bright
T2 image, the vertebral body will image low signal intensity After radiation treatment, the bone marrow is replaced with fat and the vertebral bodies are brighter on T1 images The spinal discs show low signal on T1, high signal on T2 The nucleus is brighter because of greater water content Degenerative disc disease is a progressive decrease in signal intensity. Ligaments: The spinal ligaments demonstrate low signal intensity on T1 and T2 because of their high collagen content, except for the ligamentum flavum. Spinal Cord and CSF: T1 image the cord has an intermediate signal T2 image the cord has a low signal CSF low signal on T1 (lower than the spinal cord) CSF high signal on T2 |
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lumbar sagittal MRI view
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1. Conus
2. Bone marrow Normal bone marrow signal is higher than muscle or disc on T1 Marrow proliferation disorders Multiple myeloma Leukemia Abnormal findings include a signal in the bone that is equal or lower than muscle on T1 3. Endplates 4. Disc: Hydrated, Desiccated or Displaced 5. Foramen |
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lumbar axial MRI view
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1. Facets
2. Foramen 3. Disc 4. Spinal cord 5. Paraspinals, multifidi, quadratus lumborum and psoas Look for atrophy, fat or abscesses 6. Look at the kidneys, renal arteries, aorta and inferior vena cava |
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disc herniation, bulge, protrusion, extrusion
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Herniation:
A term originally meaning a focal protrusion, the meaning of which has become blurred, and which now seems to include bulge, protrusion, extrusion and osteophyte formation Bulge: Broad based disc displacement Usually degenerative No evidence that this occurs acutely May be an incidental finding – presentation must correlate with clinical findings Protrusion: Focal disc displacement Connection to native disc of similar dimension May or may not be acute Extrusion: Focal disc displacement Connection to native disc attenuated or absent Sequestered or floating disc |
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spinal stenosis
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Narrowing of the central spinal canal, neural foramen, lateral recess or any combination of these anatomic regions, by soft tissue or osseous structures that impinge on neural elements
Standard classification for stenosis is based on cause • Congenital: (e.g., short pedicles) • Acquired: degenerative Causes of Spinal Stenosis • Congenital • Osteophytes • Alignment abnormalities • Ligament or facet hypertrophy • Disc abnormalities Levels of Stenosis • Central • Lateral recess • Foraminal Diagnosis • Depends on size of canal • Measurements are not always taken. The diagnosis is made via the shape of the canal and thecal sac. Normally round or oval on axial images • Quantify as mild, moderate or severe • Must correlate imaging studies with clinical examination • May produce myelopathy or radiculopathy |
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when do patients need Lumbar imaging
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Hx of Cancer and present w/cancer
Age > 50 w/1st time back pain, unexplained weight loss Failure to respond to conservative tx. MRI was no better at predicting these problems than an X-ray. Only time it was better for MRI was when there were these cauda equina sx’s -Loss of B&B (bowel and bladder -LE weakness -Diminished or Absent LE reflexes |
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what are the common views of the hip Xray
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AP
Unilateral AP Lateral frog leg |
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purpose and process of AP pelvis Xray
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Demonstrates the entire pelvis, sacrum, coccyx, SIJ, lumbosacral articulation, and both proximal femur and hip joints. Scout for trauma and identify the need for a unilateral AP of the hip.
• Trace the pelvic inlet (Males<90° females>90°) • Observe bilateral lower 1/3 SIJ • Observe and compare the shape and color of the ilium/sacrum • Trace the femoral head in the acetabulum • Visualize the acetabular roof along with the anterior and posterior acetabular rims (look for the cross-over sign) • Look at the head-neck junction, angle of inclination - should be 125 |
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purpose and process of unilateral AP pelvis xray
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closer look at the hip joint. Identify all anatomical landmarks including the acetabulum, femoral head, neck, proximal 1/3 of the shaft, greater trochanter, and angle of inclination of the femoral neck to the shaft (125-135°).
• Trace Shenton’s Line – smooth curve along the medial and superior surface of the obturator foramen to the medial aspect of the femoral neck. • Trace the iliofemoral line – trace a smooth curve from the greater trochanter along the femoral neck up through the outer surface of the ilium (may help in the identification of disorders at the head-neck junction, i.e. slipped capital femoral epiphysis) • Radiographic Teardrop – formed by the cortical surfaces of the ischium and the pubis, representing the anteroinferior aspect of the acetabulum. |
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XXX purpose and process of lateral frog leg pelvis xray
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Demonstrates the femoral head, neck, and proximal 1/3 of the femoral shaft and greater and lesser trochanters from the medial aspect.
Cross-Table Lateral – Identify the same landmarks as the frog-leg lateral view. Used in patients who cannot rotate their leg to the position of the frog-leg. • Viewing the femur from medial to lateral • Lesser trochanter is anterior, and the greater trochanter is superimposed behind the femoral neck • Able to see more of the femoral head • Acetabular roof and anterior/posterior rims still visible |
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what is DDH
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Developmental Dysplasia of the Hip (DDH) –as inability of acetabulum and femoral head to form a congruent articulation.
Identify the angle of inclination (>175°) Identify Shenton’s line A smooth curve drawn from the medial neck of the femur to the inferior border of the superior pubic ramus on xray |
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what is legg-calve perthese disease
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Legg-Calve-Perthes Disease (LCP) – Essentially AVN in the pediatric hip
infarction of the bony epiphysis of the femoral head. LCPD represents idiopathic avascular necrosis of the femoral head. Short history of Painful limp: Flex, Abd, ER Reduced mobility Muscle atrophy Trendelenburg test positive Leads to adult DJD Small obturator foramen Increased medial hip joint space Small femoral head Crescent sign Subcondral fracture with nitrogen gas collection On the femoral head Epiphyseal fragmentation slight widening of the hip joint, representing a small joint effusion. Joint widening can also be secondary to hypertrophy of the cartilage. |
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what is scfe
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Slipped Capital Femoral Epiphysis (SCFE) – trace Shenton’s line and look at the head neck junction
Slipping of the neck on the femoral head Xray: Asymmetrical growth plate Medial slippage of the femoral epiphysis Surgical stabilization is required |
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what is avascular necrosis
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necrosis of the femoral head secondary to trauma, infection, prolonged steroid use, chemotherapy, etc. Femoral head receives blood supply from foveal artery in the ligamentum teres. Neck of the femur receives blood supply from the circumflex femoral arteries.
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what is a pelvic fracture
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– location of the fracture determines the patient’s prognosis (intracapsular vs. extracapsular) based on the vascular structures that may affect the overall healing process (potentially leading to AVN).
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what is pelvic OA
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Remember the 5 signs common for degenerative joint disease from earlier in the semester. Included in your assessment should be the identification of any medial migration of the femoral head (protrusion acetabuli).
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what is trochanteric bursitis
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?
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what are the common views for Ankle X ray
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1. AP
2. AP Mortise 3. Lateral Weightbearing or Non-weightbearing 4. Oblique |
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what is the position for Ankle AP Xray view and reading process
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AP View
The patient is supine with the heel resting on the film cassette. The foot is in a neutral position. The central beam is directed vertically to the ankle joint at the midpoint between both malleoli. Identify: 1. Distal tibia 2. Distal fibula 3. Distal tibiofibular joint 4. Ankle Mortise 5. Medial malleolus 6. Lateral malleolus – superimposed behind the lateral aspect of the tibia 7. Dome of the talus Medial or lateral shift of the talus in the mortise may indicate the presence of laxity, instability, or a fracture at the ankle. |
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what is the position for ankle AP mortise view Xray and reading process
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Demonstrates the entire mortise view. The leg is internally rotated 15°-20° to place both malleoli in the same plane, avoiding superimposition of the lateral aspect of the tibia over the fibula.
Identify: 1. Distal tibia 2. Distal fibula 3. Dome of the talus 4. Entire ankle mortise Abnormal widening of the mortise or displacement of the talus may indicate the presence of ligamentous laxity, injury, or ankle fracture. |
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what is the position for ankle lateral view Xray and reading process
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The patient can be WB or NWB, the fibula is resting on the film cassette and the foot is in the neutral position. The central beam is directed vertically to the medial malleolus.
Identify: 1. Distal tibia 2. Distal fibula superimposed behind the tibia and the talus 3. Talus 4. Calcaneus 5. Navicular, Cuboid, Base of the 5th Metatarsal 6. Can also see tibiotalar, calcaneocuboid, talonavicular, and talocalcaneonavicular (subtalar) joints |
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what is the position and reading process for ankle oblique view Xray
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The patient is supine and the foot and leg are internally rotated approximately 35-45°. The foot is in the neutral position. The central beam is directed perpendicular to the lateral malleolus.
Identify: 1. Distal tibiofibular syndesmosis 2. Distal fibula 3. Lateral malleolus Distinguish the oblique view from the mortise view based on the angle of the foot on the film. |
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what are the common views for foot xray
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1. AP
2. Lateral 3. Oblique |
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what is the position and reading process for foot AP view Xray
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The patient is supine with the knee flexed, and the sole of the foot placed firmly on the film cassette. The central beam is directed vertically through the base of the third metatarsal.
Identify: 1. Phalanges with corresponding PIP and DIP joints 2. Metatarsals with corresponding MTP and tarsometatarsal joint 3. Cuneiforms 4. Cuboid 5. Navicular 6. Sesamoid bones 7. Transverse tarsal joints 8. First inter-metatarsal angle: 5-15° (Looking for presence of hallux valgus and other deformities caused by different angulation) |
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what is the position and reading process for foot Lateral view Xray
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The patient can be WB or NWB, with the fibula resting on the film cassette and the foot in a neutral position. The central beam is directed vertically through the base of the third metatarsal.
Identify: 1. Subtalar joints 2. Transverse tarsal joints 3. Tarsometatarsal joint |
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XXX what is the position and reading process for foot oblique view Xray
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The patient is supine on the table with the knee flexed. The lateral border of the foot is elevated 40°-45° from the film cassette. The central beam is directed vertically through the base of the third metatarsal.
Identify: 1. Phalanges, Metatarsals 2. Intermetatarsal joints 3. 3rd Cuneiform (lateral cuneiform) 4. Navicular, Cuboid 5. Talus, Calcaneus |
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what are the MRI views for the foot and ankle
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Axial
Coronal Sagittal |
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during an MRI of the foot and ankle you should ID
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Identify:
Anterior Muscles/Tendons: 1. Anterior tibialis 2. Extensor Hallucis Longus 3. Extensor Digitorum Longus 4. Peroneus/fibularis Tertius Medial Muscles/Tendons 1. Tibialis Posterior 2. Flexor Digitorum Longus 3. Flexor Hallucis Longus Lateral mm./tendons 1. Peroneus/fibularis longus 2. Peroneus/fibularis brevis Posterior mm./tendons 1. Achilles tendon 2. Gastrocnemius 3. Soleus |
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when is ankle imaging indicated?
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, if there is tenderness over the crests or midportions of the malleoli (ankle series) or the navicular or base of the fifth metatarsal (foot series) or if there is inability to bear weight both immediately after injury and during examination.
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