Question 11#

Which of these conditions is a disorder of collagen?

A. Marfan’s syndrome

Osteogenesis imperfecta. Osteogenesis imperfecta is a disorder of Type 1 collagen. Marfan’s syndrome is a disorder of fibrillin (a component of microfibrils in elastic tissue). Cutis laxa is a disorder of elastin and Progeria is a disorder of lamin A (a component of nuclear lamina). Pallister-Hall is a rare syndrome associated with polydactyly.

Question 12#

Body mass index is calculated: 

A. By a ratio of soft tissue mass to bone mass

Question 13#

In order to practice evidence-based plastic surgery, a knowledge of statistical concepts is important. The following statements are true except:

A. Regression analysis is used to find how one set of data relates to another

The mode is the point which has half the values above and half the values below. This statement is incorrect; the mode is NOT the point which has half the values above and half the values below. This defines the median. The mode is the single value that occurs most frequently

Question 14#

Tissue expansion:

A. May be used in conjunction with component separation to allow primary closure of abdominal defects involving 25% or less of the abdominal surface area

In the extremities has been associated with higher levels of complications. Adequate reconstruction is usually achieved despite these complications when the technique is used.

Question 15#

The flexor hallucis muscle has the following pattern of blood supply according to Mathes and Nahai:

A. I

IV. The supply is via multiple segmental vessels. Many of the flexor and extensor muscles of the lower limb have this pattern, so it is actually easy to remember: flexor digitorum, flexor hallucis, extensor digitorum, extensor hallucis and tibialis anterior all have Type IV supply.