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Grai Orthopedic Implants
Grai Orthopedic Implants
Two distinct femoral designs: Anatomic (box-like) femoral profile and swept-back (rounder) femoral profile. Rounded sagittal profile, as found in the SK1 knee, 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 SK1 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 of the SK1 knee 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.
Except the wider trochlear groove, SK1 knee system provides a set of plan to accords with the biomechanics of patello femoral joint, including loosening of femoral retinaculum, more lateral trochlear and clinically proven good effect circular patella. The wider proximal trochlear groove offers excellent patellar tracking regardless of the patient's Q-angle.
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