Block 8 - Musculoskeletal Flashcards
How should you approach pelvic x-rays?
Pelvic X-Rays
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1) Trace the three rings:
- main pelvic ring and two obturator foramen
- consider fracture if there is a disruption
- if you find one fracture always look for a second
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2) Look at the joint spaces:
- sacroiliac joints: symmetrical ~2-4mm
- symphysis pubis: =5mm
- if widened consider pelvic fracture
- 3) Acetabulum
- 4) Sacral foramina
- 5) Proximal femur
What are 2 types of pelvic fractures?
Open book pelvic fractures:
- ligamentous rupture or fracture of both:
- 1) anterior arch-e.g. pubic diastasis/ pubic rami #
- 2) posterior arch-e.g. SI joint widening or diastasis/ posterior ilium #
- Unstable fracture, can lose large volume of blood in a trauma case.
Pubic rami fractures:
- Always look for a second # in the same ring and also check the other side.
- Bilateral pubic rami # + L SI joint dislocation
How should you approach hip x-rays?
Hip X-Rays
- Joint space-access joint space for narrowing or osteophytes e.g osteoarthritis
- Look at femoral head and neck-compare symmetry and length to other side, look for breaches in cortex-may be #
- Look for normal smooth Shenton’s line-disruption may mean #
- In any musculoskeletal X-Rays assess two views
How should you approach knee x-rays?
Knee X-Rays
- Assess the joint lines - look for asymmetry or narrowing - e.g. osteoarthritis
- Look closely at tibial plateaus and intercondylar eminence- fractures here are often subtle
- Look for an effusion or a lipohaemarthrosis (fat & blood in the joint) on horizontal lateral view-may be the only sign of fracture.
- Look at main bones: tibia, fibula, distal femur, patella
- Sometimes skyline view requested for patella
What is one type of knee fracture?
Tibial plateau fractures
- Require discussion with ortho/ORIF as intra-articular
- Note the fluid:fat level (lipohaemarthrosis) on the lateral view
- Fat is less dense so floats on top of the blood
Approach to an ankle x-ray?
Ankle X-Ray
- Assess ankle joint (mortise) - should be nice and even on all sides, and talar dome smooth
- Assess tibia and fibula especially malleoli, look for spiral fibula fractures on lateral view
- If there is one fracture look for another - especially trimalleolar fracture
Type of ankle fracture?
Approach to a foot x-ray?
Foot X-Ray
- Review bones - check around cortex, look for disruptions, anything not attached (??avulsion/ ossicle or bone fragment)
- Assess joints for normal joint space/ deformity, signs arthritis
- Look for Lisfranc injury (disruption of Lisfranc ligament between base 2nd MT and 2nd cuneiform
- Look for Chopart injury (fracture-dislocation mid-tarsal joint)
- Look for base 5th metatarsal fracture or avulsion (common)
- Look for calcaneal fractures
- Look for stress # (2nd and 3rd MT)
3 types of foot fractures?
How do malignant bone lesions appear on x-ray?
- Primary e.g. osteosarcoma - usually lytic lesions
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Secondary - far more common
- lytic (osteoclastic) → looks moth-eaten e.g. lung ca, melanoma, renal cell ca, thyroid
- sclerotic (osteoblastic) → looks like crazy paving e.g. prostate ca, breast ca (may be mixed)
Musculoskeletal history protocol?
Shoulder examination protocol?
Elbow examination protocol?
Hand & Wrist examination protocol?
Hip history protocol?
Hip examination protocol?
Knee history protocol?
Knee Examination Protocol?
Low back pain history protocol?
Low back pain examination protocol?
Slump or SLR test?
The Slump test was found to be more sensitive (0.84) than the SLR (0.52) in the patients with lumbar disc herniation. However, the SLR was found to be a slightly more specific test (0.89) than the Slump test (0.83). (Clinical Journal of Rheumatology, April 2008).
Both the Slump and the SLR tests elicit pain in the presence of lumbar disc herniation due to the traction of the involved nerve root. The SLR applies traction primarily to L5 and S1 roots. The Slump test in contrast, may apply further traction to all the lumbar roots. The examiner applies traction during the SLR test by hip flexion and knee extension. During the Slump test, further traction is applied by additional hip flexion and spinal flexion.
Positive SLR: straight leg raising, by itself, can produce pain from a variety of sources, including myogenic pain, ischial bursitis, annular tear, and hamstring tightness, as well as herniated disc.
Identify the major bones in the radiograph below:
RADL:H:14 Lateral view of the human knee
On the juvenile radiograph note:
- The distal femur
- The epiphysis on the tibial plateau
- The epiphysis on the proximal fibula
- The growth plate forming the tibial tuberosity
YELLOW = The epiphysis on the tibial plateau
ORANGE = The epiphysis on the proximal fibula
BLUE = The growth plate forming the tibial tuberosity
RADL:H:14 Lateral view of the human knee
On the adult radiograph note:
- Femoral condyles
- Patella
- Tibia
- Fibula
- Tibial tuberosity
*Additional radiographic: Frontal (AP) view of the knee
Patient data: 58 year old female
Identify the bones on the radiograph below: