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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Cartes-fiches
41. Retaining the PCL helps to reduce shear forces at the prosthesis bone interface
42. PCL retaining knees require less bone removal than PS knees
43. PCL substituting knees provide predictable rollback
44. Asymmetrical tibial components cover more of the tibial surface
45. All fixed bearing tibial trays are made from titanium alloy
46. The fatigue strength of titanium alloy allows thinner trays
47. The Sigma modular tibial tray has a cobalt chrome option
48. Titanium can be used as a bearing surface
49. Sigma modular trays have a tray keel angle of
50. All modular trays accept stems and wedges
??51. All Sigma fixed bearing inserts have the same sagittal bearing geometry
52. How much rollback do Sigma PLI inserts allow
53. Sigma curved inserts allow the same rollback as the PLI insert
54. Sigma curved and PS fixed bearings have the same bearing geometry
?55. Sigma PS inserts can be used with all Sigma trays
3.3S48
.... with all Sigma fixed bearing trays
56. Sigma PS Plus inserts can only be used with modular trays
57. Sigma all-poly tibial components are only available in PLI, Curved and PS formats
??58. Mobile bearing tray components are only availabel in PLI, Curved and PS formats
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??59. Which of the following are Depuy mobile bearing designs
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60. MBT tibial platform are made of cobalt chrome alloy
??61. The MBT post bearing supports the main compressive load
62. MBT platforms can be used with Sigma and LCS Complete systems
??63. MBT platforms are available in two options
?64. Sigma MBT curved bearing inserts have the same geometry as fixed bearing curved inserts
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?65. The Sigma RP curved bearing centreline is offset to promote
3.3S54
... improved patellar function?
66. A curved recess in the anterior border of the curved RP Bearing delays patella ligament impingement
67. The Sigma RP PS insert allows 5° of hyperextension
?68. Sigma RP Bearings must be used with the same size femoral component
3.3S55
69. MBT tibial trays allow a one-up one-down size mix
70. How many degrees of rotation do MBT bearings allow before tray overhang?
70.1 The Sigma RP-F bearing insert has the same spine geometry as the standard PS insert
71. How many degrees of rotation do MBT RP-F bearings allow before tray overhang?
72. The Sigma RP-F insert is strengthened by the addition of
73. LCS Complete RP inserts have spherical bearing geometry
74. The posterior lip of the LCS RP bearing is reduced to increase
75. The LCS RPS spine and cam engage at 10° of flexion
76. Point contact loads on the LCS RPS tibial spine are prevented by
