Mohammad-MSK-Core Flashcards
What’s an antalgic gait?
Painful gait
Not wanting to spend time on the affected limb
Differential for an antaglic gait in a 1-3 yr? (6)
Septic Arthritis Osteo Fracture Diskitis Neoplasm Trauma
Causes of abnormal gait? (5)
Pain and limp Joint abnormalities Leg length discrepancies Neuromuscular Toe walking
What’s the most common organism causing Septic arthritis?
Staph aureus
Which age group is more likely to get
- Strep Pneumo
- Kingella Kingae
- GBS
- Gonorrhea
- Strep pneum: <2 yr
- Kingella Kingae: <5 yrs
- GBS: neonates
- Gonorrhea: sexually active adolescents and neos
What are the most commonly affected joints in septic arthritis?
- Knee
- Hip
- Ankle
- Elbow
What would septic arthritis be commonly associated with in neonates and infants?
osteomyelitis: Transphyseal transfer of organisms
Manifestations of septic arthritis?
- Nonspecific in younger children
- Fever, joint swelling, erythema and warmth (seen earlier than in Osteo)
Management of septic arthritis?
- If Hip: surgical emergency
- Blood culture
- Joint aspirate for Gram stain and c/s and fluid analysis
- BW: CBC, CRP and ESR (which might be normal)
- US
- Abx in neo: amp/cefotax. In Older: Ancef/Vanco
What’s the most sensitive way of detecting Kingella Kingae?
PCR
What position would a septic hip be in?
Flexed
Abducted
Externally rotated
What’s metatarsus adductus?
Metatarsus varus?
Adductus: Adduction of the forefoot ONLY
Varus: Adduction and supination of the forefoot
what’s a:
forefoot
Midfoot
hindfoot
F: toes and matatarsals
M: cuneiforms, navicular, cuboid
H: talus and calcaneus
What causes metatarsus adductus?
Intrauterine molding
50% it’s bilateral
What’s the effect of uncorrected metatarsus adductus?
In-toe gait
abnormal shoe wear
May have hallux varus (no Tx needed)
Tx of metatarsus adductus?
Depends on the rigidity
- If flexible and overcorrect into abduction w passive
manipulation: Observe - If can correct just to neutral position, provide stretching exercises in the office.
- If child walking, parents can try reversing shoes
- If still not working, reverse last shoes prescribed and worn 22hr/day w reassessment in 4-6 wks
- If no improvement, serial plaster casts should be considered
- If foot cannot be corrected to neutral position from the beginning, serial casting. Best results before 8 months
-Sx if still no response. Usually delayed until 4-6 yrs
Newborn w metatarsus adductus. Cannot bring foot to neutral position. What to do? Goal behind this Tx?
Serial casting
Best results before 8 months
Goal: Stretching, alter physeal growth to promote permanent correction
Patient with Hallux varus. what to do?
No Tx.
Improves on its own
What’s Calcaneovalgus foot?
Excessive dorsiflexion and eversion of hindfoot.
May have abducted forefoot
May have external tibial torsion
Which deformities has the highest association with Developmental Dysplasia of the hip?
Calcaneovalgus foot (19.4%)
Which conditions can lead to calcaneovalgus foot deformities?
Polio
Myelomeningocele
Weakness of the gastrocsoleus muscle
Tx of calcaneovalgus foot?
if full ROM, observe. Usually resolves in 1wk
Stretching if some restriction
Casting is rarely required
What’s club foot?
congenital talipes equinovarus:
Malalignment of the Calcaneotalarnavicular complex
More commonly in males 2:1
50% bilateral
What’s the pathoanatomy of club foot?
CAVE: Cavus Adductus Varus Equinus
All have calf atrophy
Higher association of DDH
Tibial shortening
leg length discrepancy (shorter ipsilateral)
Causes of club foot?
- Positional
- Congenital
- Underlying diagnosis (neuromuscular, syndromic)
- focal dysplastic
What congenital conditions are associated w club foot?
22q11
T18
Risk of clubfoot if one parent and one sibling has clubfoot?
25%
Child has clubfoot. What else should he/she be examined for?
spinal dysraphism
Treatment of clubfoot?
-OLD: Nonoperative post birth: Taping and strapping Manipulation Serial casting Functional treatment.
-New: Ponseti method
What are some common long term complication/sequalea of club feet?
- Stiffness
- Pain in adulthood
What’s the Ponseti tx for club foot?
CAVE
- Cast: weekly, usually 5-10x
- Tenotomy of the heel as an outpatient
- Long leg cast w foot in maximal abduction and dorsiflexion x 3-4wks
- Bracing: fulltime for 3 months, nighttime only for 3-5 yrs.
T or F
Most patients w clubfoot require sx.
True
Eventually they do
What’s the most common cause of in-toeing in children younger than one year?
Metatarsus adductus
What should children with Metatarsus adductus be examined for?
DDH
Torticollis
What are some focused physical exam manuever for a child with in toeing?
- Heel bisector line
- Flexibility of metatarsus adductus
- Thigh-foot angle
- Hip rotation
- DDH
- Torticollis
- Ankle ROM
- Limb length
- Gait
Indications for surgical referral in a child with intoeing? (6)
- Semiflexible metatarsus adductus post 6 months
- Rigid metatarsus adductus (at any age)
- Children ≥8 years with activity limiting or cosmetically unacceptable in-toeing due to tibial torsion
- Children ≥11 years with activity limiting or cosmetically unacceptable in-toeing due to increased femoral anteversion
- In-toeing that does not follow the expected course
- unilateral or asymmetric in-toeing with findings suggestive of cerebral palsy or developmental dysplasia/dislocation of the hip
By what age does metatarsus adductus tend to resolve by
-Usually by 1 yr
Most common cause of in toeing in age 1-4?
>3?
1-3: Internal tibial rotation. Tends to resolve by 5yr
>3: Increased femur antiversion. Resolves by 11yr. They tend to prefer to sit in W…which should be discouraged
Etiology of Legg Calve Perthes disease ?
Unknown etiology
Interruption of blood supply to the proximal fem head/epiphysis leading to osteonecrosis
Most common age for Legg Cave Parthes?
Boy more affected than girls
Usually boys 4-8yrs
10% have bilat involvement
Highest in white
Manifestations of Legg Cave Parthes?
Limp is most common
Pain w activity
Antalgic gait
May have atrophy of the muscles of the thigh, calf or buttock, from disuse
Limited Hip internal rotation and abduction
how to make the diagnosis of Legg Cave Parthes?Best imaging modality?
Imaging
**Need AP and frogleg but xray can only detect later disease and not early
Best imaging:
MRI
If no MRI, Bone scan
What are the radiographic findings in Legg Cave Parthes? (5)
- Decreased size of ossification centre
- Lateralization of the femoral head
- Increased widening of the medial joint space
- Sub chondoral #
- Irregularity of physis
Differential for avascular necrosis of the femoral head? (5)
- Sickle cell disease
- Thal
- Steroid
- Trauma from hip dislocation
- Septic arthritis
What endocrine disorder can cause epiphyseal dysplasia?
Hypothyroid
Tx for Legg Cave Parthes?
- Activity limitation
- protected weight bearing
- NSAIDs
- Casting (in abduction and internal rotation)
- Sx
Who does SCFE affect? Pathology? Ethnicity?
Older children age 10-16
Failure of the physis and displacement of the femoral head relative to the neck.
Obese African american
More boys
Presentation of SCFE?
Chronic presentation is the most common w vague groin, thigh pain w limp
What’s a stable vs unstable SCFE?
If able to walk: Stable
Unable or need walking aids: Unstable; higher prevalence of osteonecrosis (likely from the displacement)
What conditions increase the risk of SCFE?
- Hypothyrpoidism
- Hypopit
- Renal osteodystrophy
- Obesity (one of the largest RF)
What’s the ROM like in SCFE? Legg Cave Parthes?
SCFE: limited internal rotation and limited abduction and limited flexion
LCP: limited internal rotation and limited abduction
Child w unstable SCFE. Which position would his leg be in?
- Shortened
- Flexed
- Externally rotated.
- Abducted
Which imagings are needed to diagnose SCFE?
AP and frog leg of the BOTH hips
What are the ragiographic findings in SCFE?
- widening and irregularity of the physis
- decrease in epiphyseal height.
- crescent-shaped area of increased density in the proximal portion of the femoral neck
- “blanch sign of Steel” :double density from the anteriorly displaced femoral neck overlying the femoral head.
- Klein’s line no longer intersects the epiphysis
Management of SCFE?
- Admit (MUST ADMIT)
- Bed rest
- If obese, investigate for endocrinopathy
- Goal to close the physis and stabilize it
- Gold Standard: Pinning the head
- Prophylactic pinning of other side (20-40% develop contralateral SCFE)
What are the two most serious coplications of SCFE?
Osteonecrosis
Chondrolysis
Most common cause of anterior knee pain?
Patellofemoral stress syndrom
Diagnosis of exclusion
No explanation for pain.