Knee Tibia & Fibula Flashcards
What condition is likely the cause of these findings?
- Subchondral sclerosis with loss of medial joint space (non-uniform loss of joint space)
- Subchondral cysts & small osteophyte on medial side
→ Degenerative Arthritis → OA or DJD of medial femoral tibial jt
Isolated degeneration of patellar-femoral joint should raise suspicion for what condition
CPPD (Deposition disease)
Genu varus (bowlegged) is associated with what conditon?
Degenerative joint disease
What condition is likely the cause of these findings?
Spiking of tibial spine - DJD
What condition is likely the cause of these findings?
What condition is likely the cause of these findings?
Circle in back is not inter-articular loose body
What condition is likely the cause of these findings?
- loss of joint space, osteophytes
Features of ____ include:
- Typically affects all 3 compartments of knee
- Soft tissue swelling & joint effusion
- Sclerosis absent or minimal
- Subchondral erosion & periarticular osteopenia
- Baker’s cyst can form in posterior medial knee
Rheumatoid Arthritis
Genu valgus (knock-kneed) is associated with what condition
Rheumatoid Arthritis
What condition is likely the cause of these findings of bilateral, symmetric uniform joint loss?
Rhuematoid Arthritis
What condition is likely the cause of these findings?
What condition is likely the cause of these findings?
Due to location at patello-femoral joint → CPPD
Features of ____ include:
- Chondrocalcinosis of hyaline cartilage & fibrous cartilage (meniscus)
- Involves patello-femoral joint first (also typically involves lateral femoral tibial jt before medial)
CPPD (calcium pyrophosphate deposition disease)
What condition is likely the cause of these findings?
What condition is likely the cause of these findings?
CPPD (hyaline cartilage)
What condition is likely the cause of these findings?
- Uniform loss of joint space
- Inflammatory arthritis with associated degenerative changes → Septic Arthritis or Juvenile Idiopathic Arthritis or Hemophilia if involving other joints in the body
What condition is likely the cause of these findings?
What condition is likely the cause of these findings?
- Sheet like calcification in tissues → DDX: Dermatomyositis, SLE or sclerotoma
Features of ____ include:
- Overgrowth of epiphyses
- Squared inferior pole of the patella
- Widened intercondylar notch
- Increased soft tissue density around jointso
- Early degenerative joint disease & Osteoporosis
- Pseudotumor
Hemophilia
What condition is likely the cause of these findings?
- Avulsion fx at lateral tibial plateau (Segond fx)
- Deepening of lateral femoral notch
- Joint effusion
Compression fx at femoral notch → specific for ACL tear
What condition is likely the cause of these findings?
ACL tear
What condition is likely the cause of these findings?
- Calcific density
- Fragment of subchondral bone at medial femoral condyle
- Osteochondritis dessecans
(Refer for MRI to look at cartilage)
What condition is likely the cause of these findings?
Lateral tibial plateau fx
Features of ____ include:
- Look for depression of lateral plateau articular surface
- Look for cortical disruption of proximal lateral tibial cortex
Lateral tibial plateau fx
What condition is likely the cause of these findings?
- Solid periosteal reaction, cortical thickening at mid-diaphysis
- Small linear lucency through region of cortical thickening
- Thickening of soft tissues
DDX: Fatigue (stress) fx or possible tumor such as osteoid osteoma
What condition is likely the cause of these findings?
- Lucent lesion in proximal tibial metaphysis
- Increased density, area of sclerosis around lucency
DDX: Brodies abscess, less likely osteoblastoma and osteoid osteoma
Features of ____ include:
- Permeative/motheaten destruction w/ periosteal responses
- Common in femur & tibia
Osteomyelitis
What condition is likely the cause of these findings?
What condition is likely the cause of these findings?
DDX for lucent metaphyseal bands: Leukemia, Rickets
What DDX are likely the cause of these findings?
DDX: Tuberculous Arthritis, Septic Arthritis, Neuropathic Arthropathy
What condition is likely the cause of these findings?
- Bone disease - osteoblastic appearence, increased density proximal tibial metaphysis to diaphysis
- Periosteal responses
- Aggressive
DDX: Osteosarcoma, Ewing’s Sarcoma, Osteomyelitis (Osteosarc most likely due to blastic appearence)
Recommendations: oncological & MRI
Features of ___ include:
- Meatphyseal
- Can be osteoblastic (MC), osteolytic or mixed
- Periosteal reactions (spicula
- Soft tissue extension
Osteosarcoma
What condition is likely the cause of these findings?
Osteosarcoma
What condition is likely the cause of these findings?
- Pedunculated exocytosis
DX: Osteochondroma
What condition is likely the cause of these findings?
What condition is likely the cause of these findings?
Osteochondromatosis
What condition is likely the cause of these findings?
- Lucency in medial metaphysis of tibia, well-defined by sclerosis
- Soap bubble appearence
DDX: Benign lesion most likely non-ossifying fibroma, could also be fibrous dysplasia
Features of ____ include:
- Eccentrically located within cortex
- Soap bubbly/expansile
- Metaphyseal in location typically
Non-ossifying fibroma
(Non-ossifying = 3cm or larger, called Fibrous cortical defect if = 1-3cm or in children 4-8 y.o)
What DDX are likely the cause of these findings?
- Giant cell tumor
- Chondroblastoma
- ABC (aneurysmal bone cyst)
In kids = ICE (Infection, Chondroblastoma, Eosinophilic Granuloma)
Features of ____ include:
- Metaphyseal extending to epiphyseal
- Soap bubbly w/ short zone of transition
- Quasi-malignant
Giant cell tumor
What condition is likely the cause of these findings?
Giant cell tumor
What condition is likely the cause of these findings?
due to epiphyseal location
What condition is likely the cause of these findings?
- DDX: Bone infarct vs. Enchondroma vs. low grade Chondrosarcoma
Reccomend MRI to r/o chondrosarcoma
Features of ___ include:
- Necrosis in medullary compartment of metaphysis and/or diaphysis
- Patchy intramedullary sclerosis w/ areas of radiolucency
- Serpiginous calfication
Bone infarct
DDX: Encondroma & Low grade chondrosarcoma
Three main causes of regional osteoporosis =
Disuse
Complex Regional Pain Syndrome
Transient Regional Osteoporosis of hip/Regional Migratory Osteoporosis
What condition is likely the cause of these findings?
- Vertical bands of sclerosis at distal femur & proximal tibia
- DX: Osteopathic striata
Osteopathia striata may be present with ____ & ____ where it is then referred to as Mixed Sclerosing Bone Dysplasia
Osteopoikilosis & Osteopetrosis
Features of ___ include:
- Vertically oriented bands of sclerosis extending from metaphysis to diaphysis
Osteopathia striata
Erlenmeyer flask deformity is associated with what DDX
Osteopetrosis, Sickle Cell Anemia, Thalassemia
