ARCL 228 Lecture Notes - Lecture 23: Bone Remodeling, The Age, Iliac Crest
5 Nov 2016
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ARCL–OCT21–ADULTAGEESTIMATION
WHATISANADULT
→ Senescentchanges(boneremodeling)
→ Adultagecategories
o Fairlybroadbctherearenopeaksofgrowinginadults
o NorthAmericanSystem:don’treflectanybiologicalchange,justawayto
categorizeeverything,biologicalbeginningofadulthood
o YoungAdult(20-35yrs)
o MiddleAdult(35-50yrs)
o OldAdult(50+yrs)
→ Remember…[Adult]Agedeterminationisultimatelyanart,notaprecisescience.
EPIPHYSEALFUSION
→ inadults,stillsomebonesthathavenotfinishedfusing:
→ 1.Clavicle:importantforyoungeradlult,sternalendthatconnectswithemumbirumit
finishesfusingbyage30,ifyoufindpartiallyfusedsternalendthenyouknowtheyare
about25-30yrsold
→ 2.Sacrum:firstandsecondsacralvertebraefinishfusingolderthan25,whentheyhave
enteredintotheyoungadultagecategory
→ 3.Sternum:startsinyour30sandendsinyour40s,thefirsttothesecondandthe
secondlasttothelast,howtoknowiftheyareinthemiddleadultlagecategory,
sometimesbadbcthezypohoidprocessisverythinandcanfalloffsosometimesthisis
hardtoknowwhattheageis,sometimesthesternummayneverfusetoosothatisa
problem
→ 4.Oscoxa:iliaccrestfusestotheillium,finishesfusingat23sointheyoungadultarea,
pubicsidefusesalittleolder–trickythingaswellbcitmaybemisleading
→ focusonmanydifferentmarkersalltogethertocreatetheageestimationornarrow
downtheagecategory
AGEINGWITHPUBICSYMPHASYS
→ sometimesmisleading
→ Startwithridges+furrows(billowing)
→ Thesegeteroded,ventralrampartappears–towardsfrontthingstartstoappearwhich
isthefusingbutwesayerosion
→ Ventralrampartandbonynodulecomplete
→ Acontinousrimofboneisformed–moreovalshape
→ Rimbreaksdown
→ Symphysealsurfacebecomesporous+pitted–holesinthebone
AGEINGWITHARTICULARSURFACE(ilium)
→ Lookingatdifferentpartsofit:apex,superiordemi-face,inferiordemi-face,retro-
auriculararea.
find more resources at oneclass.com
find more resources at oneclass.com
Document Summary
Adult(cid:9)age(cid:9)categories(cid:9: fairly(cid:9)broad(cid:9)bc(cid:9)there(cid:9)are(cid:9)no(cid:9)peaks(cid:9)of(cid:9)growing(cid:9)in(cid:9)adults(cid:9, north(cid:9)american(cid:9)system:(cid:9)don"t(cid:9)reflect(cid:9)any(cid:9)biological(cid:9)change,(cid:9)just(cid:9)a(cid:9)way(cid:9)to(cid:9) categorize(cid:9)everything,(cid:9)biological(cid:9)beginning(cid:9)of(cid:9)adulthood(cid:9, young(cid:9)adult(cid:9)(20-35(cid:9)yrs)(cid:9, middle(cid:9)adult(cid:9)(35-50(cid:9)yrs)(cid:9, old(cid:9)adult(cid:9)(50+(cid:9)yrs)(cid:9)(cid:9) Arcl oct 21 adult age estimation. Re(cid:373)e(cid:373)(cid:271)er (cid:862)[adult] age deter(cid:373)i(cid:374)atio(cid:374) is ulti(cid:373)ately a(cid:374) art, (cid:374)ot a pre(cid:272)ise s(cid:272)ie(cid:374)(cid:272)e. (cid:863) In adults, still some bones that have not finished fusing: Clavicle: important for younger adlult, sternal end that connects with emumbirum it finishes fusing by age 30, if you find partially fused sternal end then you know they are about 25-30 yrs old. Sacrum: first and second sacral vertebrae finish fusing older than 25, when they have entered into the young adult age category. Os coxa: iliac crest fuses to the illium, finishes fusing at 23 so in the young adult area, pubic side fuses a little older tricky thing as well bc it may be misleading. Focus on many different markers all together to create the age estimation or narrow down the age category. These get eroded, ventral rampart appears towards front thing starts to appear which is the fusing but we say erosion.
