Alignment of hip joint sockets in hip joint replacement
First Claim
1. Apparatus for facilitating aligned location of an acetabular implant in hip joint replacement, comprising frame means adapted to bear against a plurality of protrusions of a pelvis of a patient to define a reference plane, said frame means having means to display the position of said reference plane, implant positioning means having means for holding a said implant, and means for determining the disposition of said implant positioning means with respect to said reference plane so that the disposition of an implant on said holding means relative to said reference plane may be monitored and controlled.
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Abstract
An apparatus for aligning an acetabular cup for proper placement in a socket in hip joint replacement includes a frame having feet which are placed against and fastened to the anterior superior iliac spines and the pubic tubercles respectively of the pelvis. A light beam is directed from a source through an aperture to a mirror mounted on an implant inserter. The light beam is reflected back from the mirror to a target region. When the incident and reflected beams are coincident, the cup is aligned for correct placement. The target region is rotatably and pivotably mounted for precise adjustment of the angles of abduction and anteversion respectively.
224 Citations
20 Claims
- 1. Apparatus for facilitating aligned location of an acetabular implant in hip joint replacement, comprising frame means adapted to bear against a plurality of protrusions of a pelvis of a patient to define a reference plane, said frame means having means to display the position of said reference plane, implant positioning means having means for holding a said implant, and means for determining the disposition of said implant positioning means with respect to said reference plane so that the disposition of an implant on said holding means relative to said reference plane may be monitored and controlled.
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17. Apparatus for facilitating aligned location of an acetabular implant in hip joint replacement, comprising frame means adapted to bear against a plurality of protrusions of a pelvis of a patient to define a reference plane, said frame means having means to display the position of said reference plane, implant positioning means having means for holding a said implant and for positioning a said implant in a hip socket, and means for determining the disposition of said implant positioning means with respect to said reference plane so that the disposition of an implant on said holding means relative to said reference plane may be monitored and controlled.
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18. Apparatus for facilitating aligned location of an acetabular implant in hip joint replacement, comprising utilizing frame means adapted to bear against a plurality of protrusions of a pelvis of a patient to define a reference plane, said frame means having means to display the position of said reference plane and implant positioning means having means for holding a said implant, and determining the disposition of said implant positioning means with respect to said reference plane so that the disposition of an implant on said holding means relative to said reference plane may be monitored and controlled.
- 19. Training apparatus for training in the aligned location of an acetabular implant in hip joint replacement, comprising frame means adapted to bear against a simulation of a plurality of protrusions of a pelvis of a patient to define a reference plane, said frame means having means to display the position of said reference plane, implant positioning means having means for holding a said implant, and means for determining the disposition of said implant positioning means with respect to said reference plane so that the disposition of an implant on said holding means relative to said reference plane may be monitored and controlled.
Specification