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Table 1 Jump distance of different head sizes in standard cups

From: Modular dual mobility articulation in primary and revision hip arthroplasty: lights and shadows

 

Head 22

Head 28

Head 32

Head 36

Data

Alfa

45.00°

45.00°

45.00°

45.00°

Beta

15.00°

15.00°

15.00°

15.00°

Offset

0 mm

0 mm

0 mm

0 mm

R

11 mm

14 mm

16 mm

18 mm

Intermediate

tan(α)

1

1

1

1

cos(β)

0.97

0.97

0.97

0.97

tan(Ψ) = tan(α) * cos(β)

0.97

0.97

0.97

0.97

Ψ = arctan(Ψ)

44.01°

44.01°

44.01°

44.01°

ϴ = arcsin (offset/R)

0.00°

0.00°

0.00°

0.00°

Results

JD = 2R sin((π/2 − Ψ − ϴ)/2)

8.6 mm

10.9 mm

12.5 mm

14.1 mm