Imaging SBA Module 2 Flashcards
Risk factors for patellar dislocation
trochlear dysplasia, patella alta, excessive lateralisation of tibial tuberosity
Ligamentous laxity (Ehlers danlos, Marfan)
Large joint involvement in RA
Hips, knees and shoulders.
Typically not SI joints
Bilateral SI joint arthritis
Psoriasis
Ank spond
Inflammatory Bowel
Reactive arthritis
Intrasubstance meniscal degeneration
High T2 signal NOT distrupting the articular cartilage.
If it reaches the articular cartilage it’s a tear
Purely cortical lucencies
Aggressive osteoporosis,
Haemangioma
Radiation induced changes
Normal SL angle and CL angles (& pathology)
Normal SL = 30-60
Normal CL <20
DISI: SL >60, CL >30
VISI: SL <30, CL >30
ABC
Posterior elements, lytic lesion with small foci of calcification on CT.
GCT
Well circumscribed, expansile lytic lesion
Located eccentrically in subarticular region
Scheuermann’s disease can cause
Vertebra plana
Causes of erosion of outer clavicle
RA,
Post traumatic osteolysis,
Myeloma,
Mets,
Hyper PTH,
Cleidocranial dysplasia
Pyknodysostosis
Stages of avascular necrosis
Ficat:
1 - normal/slightly increased or diminished density
2 - mixed osteopenia and sclerosis
3 - subchondral collapse or crescend sign
4 - articular collapse
5 - degenerative joint disease
Osgood schlatter
Fragmentation anterior to tibial tubercle, associated soft tissue swelling and obliteration of inferior angle of infrapatellar fat pad.
MRI: Enlarged patellar tendon with increased T1 and T2 signal at distal insertion.
Dense metaphyseal bands DDx
Normal variant,
Treated leakaemia,
Healing rickets,
heavy metal poisoning,
recovery from scurvy,
Hyper vit D,
congenital hyoothyroid
Hypoparathyroid
Multiple bone islands
Osteopoikilosis
Causes of ivory vertebra
Lymphoma,
Mets,
Pagets
Acromegaly findings
Enlarged sella turcica,
thickened cranial vault,
hypertrophied terminal tufts,
thickened heel pad,
DISH,
posterior scalloping,
Increased intervertebral height,
Longer and wider vertebral bodies
Gout MRI findings
Isointense to muscle on T1, low to iso on T2 (heterogenous)
Paeds tumour which rarely mets to the bones
Wilms
Genant grading of vertebral body fractures
0 = normal
1 = 20-25% height loss
2 = 25-40% height loss
3 = >40% height loss
Hyperphosphatasia
Genetic disorder of increased bone turnover.
Similar features to pagets but affects whole skeleton and younger.
Can cause superscan
Pagets - NM
Diffuse uptake, affecting whole bones on nuclear med.
Involvement of vertebral body AND posterior elements is classic
Osteomyelitis of the foot - distribution
Distal to tarsometatarsal joints, calcaneus and both malleoli
