Orthopaedic surgical instrument, system, and method for installing a cementless femoral stem component in a direct anterior approach hip replacement surgical procedure
AssigneeDepuy Ireland Unlimited Company
InventorsRichard A. Patnelli, James A. Anderson, Timothy N. Board, J. Bohannon Mason
Life of this patent
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Abstract
An orthopaedic surgical system for use in a direct anterior approach orthopaedic surgical hip replacement procedure on a patient's femur includes a stem insertion instrument having an offset locking shaft to install a cementless femoral stem component into a surgically-prepared intramedullary canal of a patient. A method of installing a cementless femoral stem component during performance of a direct anterior approach orthopaedic surgical hip replacement procedure is also disclosed.
Claims18
An orthopaedic surgical instrument for implanting a femoral stem component during a direct anterior approach orthopaedic hip replacement surgical procedure on a patient's femur, comprising:
- a stem insertion instrument comprising:
- an impact plate defining a proximal end of the stem insertion instrument,
- a grip extending from a distal end of the impact plate, wherein (i) a longitudinal axis of the grip extends through a center of the impact plate, and (ii) the grip comprises an outer surface that is configured to be gripped during impaction of the impact plate,
- an elongated body extending from a distal end of the grip, and
- a locking mechanism captured in the elongated body, the locking mechanism comprising (i) a knob that is rotatable relative to the elongated body, and (ii) a locking shaft secured to a distal surface of the knob and extending through the elongated body such that a threaded distal end of the locking shaft extends outwardly through an opening formed in a distal end of the elongated body, the threaded distal end of the locking shaft being configured to be threadingly received into a threaded bore formed in the femoral stem component,
- wherein the longitudinal axis of the grip and a longitudinal axis of the locking shaft define an offset angle that is between 10-30 degrees.
An orthopaedic system for use in a direct anterior approach orthopaedic hip replacement surgical procedure on a patient's femur, comprising
- an implantable femoral stem component configured to be implanted into a surgically-prepared intramedullary canal of the patient's femur, the femoral stem component comprising (i) a longitudinal axis extending in the superior/inferior direction through the femoral stem component, and (ii) an elongated threaded bore having a superior end that opens into a superior surface of the femoral stem component, and
- a stem insertion instrument comprising:
- (i) an impact plate defining a proximal end of the stem insertion instrument, (ii) a grip extending from a distal end of the impact plate, wherein (a) a longitudinal axis of the grip extends through a center of the impact plate, and (b) the grip comprises an outer surface that is configured to be gripped during impaction of the shaft's impact plate, (iii) an elongated body extending from a distal end of the grip, and (iv) a locking mechanism captured in the elongated body, the locking mechanism comprising (a) a knob that is rotatable relative to the elongated body, and (b) a locking shaft secured to a distal surface of the knob such that a threaded distal end of the locking shaft extends outwardly through an opening formed in a distal end of the elongated body and into the threaded bore of the femoral stem component,
- wherein, when the threaded distal end of the locking shaft of the stem insertion instrument is positioned in the threaded bore of the femoral stem component:
- (i) the longitudinal axis of the grip and a longitudinal axis of the locking shaft define an offset angle that is between 10-30 degrees, and (ii) the longitudinal axis of the grip is coaligned with the longitudinal axis of the femoral stem component.
A method of installing a femoral stem component during performance of a direct anterior approach orthopaedic hip replacement surgical procedure on a patient's femur, comprising:
- surgically-preparing a proximal end of the patient's femur so as to create a resected planar surface,
- threading a threaded distal end of a locking shaft of a stem insertion instrument into a threaded bore formed in the femoral stem component such that (i) a longitudinal axis of a grip of the stem insertion instrument and a longitudinal axis of the threaded bore formed in the femoral stem component define an offset angle that is between 10-30 degrees, and (ii) the longitudinal axis of the grip of the stem insertion instrument is coaligned with a longitudinal axis of the femoral stem component,
- advancing a distal end of the femoral stem component through the surgically-prepared proximal end of the patient's femur and into an intramedullary canal of the patient's femur, and
- impacting an impact plate on a proximal end of the stem insertion instrument so as to implant the femoral stem component into the intramedullary canal of the patient's femur.
Dependencies are inferred from the claim text.