Advantage of
metaphysiary-shaft modularity

.

Use and advantages of modularity : two questions

1. Is the available modularity used ?

2. Are the sizes of each of both parts suited to ordinary femurs ?

Esop ha
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Is the available modularity used ?

3433 perfectly identified, i.e. perfectly matched metaphysiary-shaft combinations have been studied :

Esop ha
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All metaphysis sizes (except 20) were used with each shaft size.

Esop ha
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All shaft sizes were used with each metaphysis size.

THE MODULARITY IS ALWAYS USED

Are the sizes of each part suited to ordinary femurs ?

CAD analysis, not of the container but of the content, according to the FESSY criteria :

 

Met
5

Met
7,5

Met
10

Met
11,25

Met
12,5

Met
13,75

Met
15

Met
16,25

Met
17,5

Met
20

TOTAL

OD 9

.

Funnel Morphotype

243

OD 10

.

15 combinations

525

OD 11

.

Standard Morphotype

.

763

OD 12

.

34 combinations

.

847

OD 13

Cylindrical Morphotype

.

.

591

OD 14

21 combinations

.

273

OD 15

.

.

191

Standard

171

383

557

369

286

246

246

178

84

33

Cylindrical

20

159

99

120

124

121

41

0

0

0

Funnel

0

0

0

0

0

16

16

15

34

28

TOTAL

191

542

656

489

410

470

303

193

118

61

3433

34 prosthesis combinations correspond to the standard morphotype ; 21 combinations correspond to the cylindrical morphotype ; 15 combinations correspond to the funnel morphotype.

 

The morphoadaptation is real : in the event of a standard morphotype, the ESOP HA prosthesis is an ordinary single body prosthesis. In the event of an abnormal morphotype, the ESOP HA prosthesis is modular : each shaft can be combined with each of the 10 metaphysis sizes.