DTRX Orthopedic Implants
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Two distinct femoral designs: Anatomic (box-like) femoral profile and swept-back (rounder) femoral profile. Rounded sagittal profile allows for greater range of motion and may be more forgiving to the retinaculum by not over tensioning the soft tissues.
The trochlear groove is a critical design feature for patella performance. Translation of the trochlear groove posteriorly in the femur has shown to resist patella crepitus and clunk. The trochlear groove has been designed to sweep back posteriorly for better patellar performance.
Anatomic (Green) vs. Swept-back Sagittal Profile (Gray)
The trochlear groove has been lengthened to further support the patella in deep flexion and provide more support of the quadriceps tendon. The junction of the trochlear groove and PS box articulates with the quadriceps tendon at 105-120 degrees of flexion.
Patellar capture during flexion must be balanced with the need for less patellar constraint in extension. The trochlear floor has been widened to reduce the constraining forces in extension. The patella track provides a 6.5 degree valgus angulation and a 2mm lateralized trochlear groove.
The knee system provides a plan that accords with the biomechanics of patello femoral joint, including loosening of femoral retinaculum, more lateral trochlear and clinically proven circular patella. This offers excellent patellar tracking regardless of the patient's Q-angle.
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