An Intelligent Instrument for Improved Leg Length and Hip Offset Accuracy in Total Hip Arthroplasty
An Intelligent Instrument for Improved Leg Length and Hip Offset Accuracy in Total Hip Arthroplasty
Leg length discrepancies following total hip arthroplasty have been associated with nerve
 palsies, gait abnormalities, and lower back pain. Leg length discrepancies are related to
 poorer functional outcomes and patient dissatisfaction. Failure to restore femoral offset
 following total hip arthroplasty has been linked to decreased range of motion and abductor
 muscle strength, impingement, limping, higher dislocation rates, increased polyethylene wear,
 and loosening of implants. Computer navigation has shown to improve the accuracy of leg
 length and hip offset during total hip arthroplasty. The investigators research objective is
 to prove the accuracy of the Intellijoint HIP™ system for determining leg length and hip
 offset. The investigators hypothesis was that Intellijoint HIP™, an imageless intraoperative
 intelligent instrument, could improve the accuracy of leg length and hip offset during
 primary total hip arthroplasty. The investigators plan to study this hypothesis in humans by
 comparing the leg length and hip offset discrepancies produced with Intellijoint HIP™ to the
 standard at the investigators institution, which is a pin and outrigger system.
Inclusion Criteria:

 -  Any patient who is undergoing a primary total hip arthroplasty at Mount Sinai
 Hospital.

 Exclusion Criteria:

 -  Pre-operative flexion contracture >30°, infection, or inability to achieve rigid
 fixation of instruments intra-operatively.