S3_L4: Pediatric Limb Deficiency Flashcards
Intramembranous ossification is the process of forming _____ by direct differentiation of mesenchymal cells into bone.
osteoblasts
Endochondral ossification is the process where mesenchymal cells undergo ____ to form cartilage that matures to become bone.
chondrogenesis
Most commonly occurring type of bone formation or ossification
Endochondral ossification
This period in pregnancy is crucial for the genesis of limb production
first trimester
Mesodermal formation of the limb occurs at ____ days of gestation and continues with differentiation until 8 weeks of gestation
26
A disorder in which affected individuals are born with missing or underdeveloped muscles on one side of the body, resulting in abnormalities that can affect the chest, shoulder, arm, and hand
Poland Syndrome
Note: This syndrome is an example of a vascular malformation.
A rare condition caused by strands of the amniotic sac that separate and entangle digits, limbs, or other parts of the fetus
Amniotic Band Syndrome
Note: This syndrome is an example of a vascular disruption.
Upper vs Lower Extremity Prosthetic Acceptance
- Acceptance of prosthesis is variable
- Prosthesis are used more as a mechanical tool
- Generally have high acceptance rates
A. Upper Extremity
B. Lower Extremity
- A
- A
- B
The highest incidence of malignancy (tumors) occurs between what age range?
12-21 years old
Absence of a limb (No limb)
Amelia
Partial absence of a limb (incomplete limb deficiency)
Meromelia
Meromelia characterized by flipper like appendages attached to the trunk
Phocomelia
Note: Phoco means seal (hand attached to shoulder, no arm)
Meromelia characterized by absence of half a limb (e.g. half radius/ulna)
Hemimelia
Meromelia characterized by missing a hand or foot
Acheira
Meromelia characterized by absence of a metacarpal or metatarsal
Adactyly
Meromelia characterized by absence of a finger or toe
Aphalangia
Frantz-O’Rahilly describes this deficiency as complete absence distal to level of loss
Transverse terminal deficiency
Frantz-O’Rahilly describes this deficiency as unaffected parts do not occur distal to and in line with deficient portion
Terminal deficiency
Frantz-O’Rahilly describes this deficiency as the absence of central elements with foreshortening of limb
Phocomelia intercalary deficiency
Frantz-O’Rahilly describes this deficiency as segmental absence of either pre or post-axial elements; intact proximal and distal
Paraxial intercalary deficiency
Frantz-O’Rahilly describes this deficiency as complete longitudinal absence either in pre or post-axial elements
Paraxial terminal deficiency
Frantz-O’Rahilly describes this deficiency as intermediate parts are deficient; elements proximal to and distal to deficient portion are present
Intercalary deficiency
- More complications (e.g., psychological anger, resentment, rejection, etc.) and harder acceptance
- Can achieve (later) functional milestones with or without prosthetic intervention
A. Congenital limb amputation
B. Acquired amputation
- B
- A
- Difficulty with training patients
- Children with upper extremity limb deficiency adapt and compensates easily with ADLs
- Cause for amputation also affects overall health of child
A. Congenital limb amputation
B. Acquired amputation
- B
- A
- B