3.3 Knee Prosthesis Design
The anatomic and functional factors that influence femoral component design
The anatomic and functional factors that influence femoral component design
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01. Alignment and stability are vital in securing the survival of knee prostheses
02. Knee component designs are categorised as:
03. Stability is accessed in three planes
04. Gait analysis studies have shown that prosthetic knees which retain both cruciates have more normal kinematics.
05. Knee femoral components are manufactured from:
06. The shape of the femoral component is designed to replicate the curves and asymmetry of the natural femur
07. The sagittal curve of a femoral component is referred to as the
08. Tibio-femoral contact pressure is greatest between 10°-40° of flexion
09. The anterior flange is designed to:
10. The coronal curve of Sigma and LCS Complete femoral components is a:
11. The S2 segment of the LCS Complete femoral component has spherical geometry
12. Single condyle contact happens during gait
13. Flat coronal geometry cause edge loading when misaligned
14. Patella resurfacing should be done
??15. All DePuy femoral components allow the patella to be resufaced
??16. All De Puy knees use the same patella prosthesis
17. The angle of the Sigma trochlear groove is
18. LCS Complete and Sigma have the same trochlear groove angle
19. All DePuy femoral components are left and right-handed
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20. The internal lugs (pegs) on the femoral component resist:
?21. Cruciate substituging CS and posterior stabilised PS refer to the same femoral component
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?22. CR and PS refer to the same femoral component
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23. CR and PS femoral components have different external geometry
??24. The Sigma PS femoral interondylar box is same witth for all sizes
25. The LCS Complete femoral intercondylar box is the same width for all sizes
26. Sigma RP-F components have the same box dimensions as the Sigma PS component
27. What are the differences between Sigma RP-F and standard condylar geometry?
28. Stems and augments can be used with the Sigma RP-F femoral component
29. Stems and augments can be used with the LCS Complete RPS femoral component
30. Normal patellae range in thickness from
??31. Sigma and LCS Complete femoral components use the same patellar components
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??32. The four Sigma patellar component designs are compatible with all Sigma femoral components
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33. LCS Complete has fixed and mobile patellar options
(mobile = rotating patella)
34. Femoral rollback occurs during
35. Rollback is symmetrical
36. Bearing contact stress is directly proporional to contact area
37. Fully congruent fixed bearing knees allow femoral rollback
38. Mobile bearing designs do not have cruiate reaining options
??39. Cruciate substituting designs must use fixed bearings
40. Studies show that PCL retaining knees have better quadriceps function
