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Orthopaedic Proceedings
Vol. 96-B, Issue SUPP_13 | Pages 40 - 40
1 Sep 2014
Hardcastle P de Jongh H du Preez G
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Purpose Of Study

The in vivo evaluation of patellofemoral contact pressures in a posterior stabilized compared to posterior cruciate sacrificing total knee arthroplasty (TKA).

Methods

A prospective descriptive non randomized study was performed on 8 patients. A standard approach to a TKA was performed using a balanced gap technique, while the patella was prepared for a resurfacing. The trial components for the posterior stabilized (PS) TKA where inserted including the gas sterilized pressure transducer (a patella button). Soft tissue was approximated and the knee was taken through full range of movement. Patellofemoral pressure was measured and captured continuously through the full range of movement. The posterior cruciate sacrificing (CS) components were inserted into the same patient and the procedure repeated. In addition, anterior translation of the tibia relative to the femur was measured at 90 degrees. The transducer was removed and final components, including a patella resurfacing were inserted.


Orthopaedic Proceedings
Vol. 95-B, Issue SUPP_29 | Pages 23 - 23
1 Aug 2013
du Preez G de Jongh H
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Background:

The literature is unclear about the optimal rotation of the femoral component during TKR. Measured resection techniques rely on the use of bony landmarks, while the balanced gap technique relies on soft tissue tensioning to guide the surgeon in rotating the femoral component. All these techniques still result in a wide range of component rotation. We compared the functional flexion axis (FFA) of 20 replaced knees to that of the contralateral normal knee to determine whether a balanced gap technique allowed us to recreate this normal anatomy.

Methods:

We reviewed the records of our TKR's from Jan 2008 to Dec 2010 and included all patients who had a normally functioning contralateral knee, tibial cut <3° from perpendicular to the mechanical axis performed by/under supervision of a single surgeon. These patients were contacted for follow up and axial flexed knee x-rays to measure femoral rotation and FFA (angle between clinical transepicondylar line and mechanical axis of tibia). These values were compared between replaced and normal knees using Students T-test.