Issue 15

D.

Kytyr et alii, Fra

ttura ed Integrit

à Strutturale, 15

(2011) 5-13; D

OI: 10.3221/IGF

-ESIS.15.01

and

absolute tem

perature T:

E E

a ET C  d p

2

1







ad

(3)

iso

Fro rep

m the set of orted elastic

samples the moduli and w

value of elas as used in n

tic modulus umerical anal

(E = 853 ± ysis.

obtained. T

his value fits

in the range

of

72 MPa) was

Figur

e 4 : Ultrasoni

c measuremen

t of elastic mo

dulus.

Nu Th and ace 20 A s des ma sim em tru dir Hy the of tetr sep con En to dep hem mo Ma Tra UH ma

merical analy e primary pu comparison tabular cup a loadsteps asc olid model w igned comp nufacturer (B plied to incl bossing the c e geometry a ections. Final perMesh (Al STEP forma the thin geom ahedral elem arately using taining noda gineering sim be quasistatic icted in Fig. ishere of th re accurate f terial propert becular bon MWPE (IS nufacturers.

sis rpose of the with its be nd the ceme ertained stre as created in onents. The eznoska s.r. ude the sphe up to the he s a cylindric assembly (pa tair Engineer t is defined etry and sm ents shown the same co l coordinates ulation softw divided in 2 6. Surface-to e cup was m orce transmis ies are descri e material p O 5834 -2)

numerical an havior durin nt mantle im ss field distrib parametric geometry o.). Inner di rical head ( ⊘ misphere. T al socket. Th rts and cons ing, Inc.) fin by areas, ther all radius of in Fig. 5 was ordinate syst and element are Ansys (A 0 loadsteps. -surface con eshed by con sion to the p bed in Tab. 1 roperties w and the b

alysis was th g the loadin planted in a s ution at the modeller Inv of the aceta ameter was 3 D = 32 m he thickness e implant w trains) was ex ite element p efore the sur the cement generated w em. HyperM conectivity. NSYS, Inc.) Loading for tact was defi tact element elvis. Frictio . All materia ere obtained one-cement

e assessment g tests. Det mall bone bl bone-cement entor (Auto bular impla 2 mm, oute m) and the c of this layer as surrounde ported in th re-processor face was disc mantle quadr ith respect to esh native fo was used fo ce value and ned between s to model f n between th ls were consi by ultraso Palacos R

of the degra ailed three-d ock was deve interface du desk, Inc.). T nt was obta r 49 mm. Th ylindrical ne was 3 mm. d with minim e STEP form was used fo retized by qu atic elements surface me rmat was con r the numeri direction of head and ac emoro-acetab e femoral he dered as isotr nic measurem (Heraeus M

dation of ace imensional f loped. The a ring gait cycl he model w ined from e geometry ck. The cem The bone wa ally 15 mm at. r model dis adratic trian were chose sh. Each com verted to An cal analysis. T downstair w etabular com ular interfac ad and the a opic linear e ent, prope edical Gmb

tabular repla inite elemen nalysis of th e. as composed datasheet pr of femoral c ent mantle w s modeled r of the bon cretization. T gular elemen n. Volume m ponent mes sys (ANSYS he simulatio alking in eac ponent. The e. The conta cetabular cup lastic. rties of the H) were pr

cement fixati t model of e gait divided of 4 separat ovided by omponent w as designed egardless of e material in he goemetry ts first. Becau esh of 10-no h was expor , Inc.) input n was assum h load step head and in ct was used was neglect stainless st ovided by

on the in ely the as by the all ted file ed are ner for ed. eel, the in se de

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