Impaction instruments
First Claim
1. An instrument for compacting bone chips into a prepared metaphyseal portion of a femur to provide a cavity conformed to receive a femoral implant stem, the instrument comprisingan impaction stem having a size and shape corresponding to the intended implant stem, said impaction stem having a proximal end and a distal end, a handle attached to the proximal end, and a plurality of enlarging portions to be attached to the impaction stem,said enlarging portions ranging in size from a largest size portion to a smallest size portion such that the bone compaction can be initiated with the largest size portion and repeated with successively smaller portions including the smallest portion to provide a cavity conformed to receive the implant stem.
2 Assignments
0 Petitions
Accused Products
Abstract
An instrument and method are provided for compacting bone chips into a prepared metaphyseal portion of a femur, in order to conform the femur to receive a femoral implant stem. The instrument comprises a tamping stem having a shape and size corresponding to the implant stem. The instrument also comprises a plurality of wedge-shaped enlarging portions ranging from largest to smallest. The method involves selecting appropriate sized enlarging portions, attaching the largest wedges to the instrument, placing the instrument into the femur, supplying bone chips, impacting the instrument to compact bone chips, and repeating compaction with successively smaller wedges until the femur is conformed to receive the femoral implant stem. Once inserted into the femur, the distal end of the instrument remains in contact with the diaphysis throughout the bone chip compaction process. Thus, bone chips cannot enter the diaphysis, and the instrument remains in proper alignment throughout the process.
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Citations
17 Claims
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1. An instrument for compacting bone chips into a prepared metaphyseal portion of a femur to provide a cavity conformed to receive a femoral implant stem, the instrument comprising
an impaction stem having a size and shape corresponding to the intended implant stem, said impaction stem having a proximal end and a distal end, a handle attached to the proximal end, and a plurality of enlarging portions to be attached to the impaction stem, said enlarging portions ranging in size from a largest size portion to a smallest size portion such that the bone compaction can be initiated with the largest size portion and repeated with successively smaller portions including the smallest portion to provide a cavity conformed to receive the implant stem.
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7. An instrument for compacting graft material into a prepared metaphyseal portion of a femur to provide a cavity conformed to receive a femoral implant stem, the instrument comprising
an impaction stem having a size and shape corresponding to the intended implant stem, said impaction stem having a proximal end and a distal end, a handle connected to the proximal end, and a plurality of enlarging portions to be attached to the impaction stem.
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9. A method for compacting bone chips into a prepared metaphyseal portion of a femur to receive a prosthesis stem comprising the steps of
providing an impaction stem having a size and shape corresponding to the size and shape of the prosthesis stem to be installed in the femur, providing a plurality of enlarging portions to be attached to the impaction stem, the enlarging portions ranging in size from a largest size portion to a smallest size portion, filling the femur cavity with bone chips, starting with the largest size portion attached to the impaction stem, compacting a layer of bone chips within the cavity, and repeating the filling and compacting with successively smaller enlarging portions to obtain a cavity lined with compacted bone chips conformed to receive the prosthesis stem.
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14. A method for compacting bone chips into a prepared metaphyseal portion a femur to provide a cavity conformed to receive a femoral implant stem comprising the steps of
providing an impaction stem having a size and shape corresponding to the size and shape of the femoral implant stem to be installed in the femur, said impaction stem having a proximal end and a distal end, providing a plurality of enlarging portions to be attached to the impaction stem, said enlarging portions ranging in size from a largest size portion to a smallest size portion, attaching the largest size enlarging portions to the proximal end of the impaction stem, placing the distal end of the impaction stem into the femur and advancing the impaction stem until the distal end contacts the diaphyseal portion of the femur, filling the prepared metaphyseal portion with graft material, compacting a layer of graft material within the cavity using vigorous blows, replacing the attached enlarging portions with smaller enlarging portions, repeating the filling and compacting steps using successively smaller enlarging portions to obtain a cavity lined with compacted graft material conformed to receive the femoral implant stem, and removing the impaction stem from the femur.
Specification