Total knee arthroplasty with symmetric femoral implant having double q-angle trochlear groove
AssigneeTotal Joint Orthopedics
InventorEric M. Dacus
Life of this patent
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Abstract
A total knee arthroplasty includes a symmetric femoral prosthesis for articulating with a tibial prosthesis in the left or right leg of a patient. The symmetric femoral prosthesis includes an anterior flange having a symmetric and upwardly diverging, generally V-shaped, double Q-angle trochlear groove formed in an anterior side thereof for accommodating natural Q-angle tracking of a natural or prosthetic patella when the symmetric femoral component is surgically implanted in either the left or right leg of a patient. In a preferred form, the double Q-angle trochlear groove is formed with an angle of + or − about 10°, for a total groove angle of about 20°.
Claims19
A total knee arthroplasty, comprising:
- a symmetric femoral component for implantation into the right or left leg of an arthroplasty patient at the lower end of a patient femur, said femoral component having a symmetric pair of generally convex condyles, and an anterior flange;
- a tibial component for implantation into an arthroplasty patient at the upper end of a patient tibia;
- and
- a bearing component carried by said tibial component, said bearing component including a pair of generally concave condylar surfaces for articulating movement of said femoral component condyles with respect thereto;
- said anterior flange of said femoral component defining a generally symmetric trochlear groove having a double Q angle for tracking of a patient patella between a fully flexed leg position generally aligned with a central vertical axis of said trochlear groove and a fully extended leg position offset in a laterally outward direction from said vertical axis by up to about 10°.
A knee prosthesis, comprising:
- a symmetric femoral component for implantation into the right or left leg of an arthroplasty patient at the lower end of a patient femur, said femoral component having a symmetric pair of generally convex condyles, and an anterior flange;
- said anterior flange of said femoral component defining a generally symmetric trochlear groove having a double Q angle for tracking of a patient patella between a fully flexed leg position generally aligned with a central vertical axis of said trochlear groove and a fully extended leg position offset in a laterally outward direction from said vertical axis by up to about 10°.
A knee prosthesis, comprising:
- a symmetric femoral component for implantation into the right or left leg of an arthroplasty patient at the lower end of a patient femur, said femoral component having a symmetric pair of generally convex condyles, and an anterior flange;
- said anterior flange of said femoral component defining a generally symmetric trochlear groove diverging upwardly to define a double Q angle for relatively smooth tracking of a patient patella between a fully flexed leg position generally aligned with a central vertical axis of said trochlear groove and a fully extended leg position offset in a laterally outward direction from said vertical axis by up to about 10°, for a total angular width of about 20°.
Dependencies are inferred from the claim text.