vascular part of bone

1.Most vascular part of a bone

a.epiphysis
b.metaphysis
c.diaphysis
d.epiphyseal cartilage

ans:b

clinical correlate: hence mc site of osteomyelitis....because blood vessels are arranged as hair pin loops

Tumours seen in metaphysis:osteosarcoma
                                                osteochondroma
                                                enchondroma
                                               osteoblastoma



2.Most common age group of perthes disease
a.1-3yrs
b.3-10yrs
c.10-20yrs
d.20-40yrs
ans:b
legg calve perthes disease(coxa plana,pseudocoxalgia)
It is named for Arthur Legg (1874-1939), an American Orthopedic Surgeon, Jacques Calvé (1875-1954), French Orthopedic Surgeon, and Georg Perthes, German Orthopedic Surgeon. and was first described by Karel Maydl

its osteochondritis of epiphysis of femoral head.
seen in boys of age 5-10yrs
symptoms :pain in hip radiating to knee.
o/e: limitation of abduction and internal rotation
treatment:conservative-plaster splint
containtment osteotomy

common ostoechondritis
perthes ds                                              femoral head
panners ds                                             capitulum
keinbock ds                                           lunate
osgood schattlers ds                             tibial tubercle
severs ds                                               calcaneal tuberosity
kohlers ds                                              navicular
freiberg ds                                             metatarsal head
scheurmann's ds                                   ring epiphsis of vertebrae
calves ds                                               central bony nucleus of vertebral body
johanssen larsen ds                              lowe pole of patella
iselin ds                                                 traction epiphysitis of 5th metatasal base

3.Psoriatic arthritis classically involves
a.PIP joint
b.DIP joint
c.MCP joint
d.CMC joint

ans :b

friends, here u should know the predeliction of joints involved in RA,OA and Psoriasis its asked repeatedly!
Osteoarthritis:involves PIP,DIP,1ST CMC JT (BASE OF THUMB)
                         spares MCP , WRIST
RA:involves any small jt of hand-PIP,MCP,WRIST 
                         spares DIP
PSORIASIS:involves PIP,DIP,MCP,WRIST.SPARING OF JT MAY OR MAY NOT PRESENT