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| ADVANCE® Medial-Pivot Knee |
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 Medial-Pivot Kinematics. Sound Clinical History. Superior
Instrumentation.
Due to the high stability and rotation provided by
the partial ball-in-socket articulation, the ADVANCE® Medial-Pivot Knee
functions like a normal knee. In fact, studies have shown it is
preferred by 8 out of 10 patients with an ADVANCE® Medial-Pivot Knee in
one leg and a competitive design in the other.7,8 In the normal knee,
the medial femoral condyle exhibits less roll than the lateral condyle
during motion. The ADVANCE® Medial-Pivot Knee was the first major system
to address and replicate these kinematics. Medial-pivoting kinematics is
a critical design rationale, which has grown through the acceptance of
modern kinematic studies and clinical success.1,2,3,7,8,9
Constant radius from 0° - 90° (1)
High contact area throughout ROM
Maintains constant ligamentous tension
throughout range of motion
Patella track at anatomic angle and depth
Does not require a large intercondylar resection
Raised anterior lip
(2) Replaces the spine of a traditional
posterior stabilized knee
Allows PCL-substitution
Lateral trough
Allows 15° of natural rotation for deep flexion
Allows freedom of
rotational alignment
Ball-in-socket articulation
Provides patient
stability through range of motion 7,8
Highest contact area through range
of motion
References
- Komistek, R.; Walker, SA: An in vivo kinematic determination of
the F/S 1000 medial pivot knee. Wright Medical Technology, Inc.,
Test Request TR97-0046, 1997.
- S.G. Elias, MD, MAR; Freeman, MD, FRCS; and E.I. Gokcay, MD: A
Correlative Study of the Geometry and Anatomy of the Distal Femur.
Clinical Orthopedics Related Research: 260, 1990.
- Blaha JD, et al. In vivo determination of kinematics for
subjects having either an anterior cruciate ligament retaining or
medial pivot total knee arthroplasty. Scientific Exhibit AAOS, 2002.
- Stuchin S, Intermediate term follow-up of a new medial-pivot
total knee. Poster presentation. AAOS 2005.
- Komistek RD, et al. In vivo fluoroscopic analyses of the normal
human knee. Clin Orthop 410:69-81. 2003.
- Minoda M, et al. Polyethylene Wear Particles in Synovial Fluid
After Total Knee Arthroplasty. Clin Orthop. 410:165-172,2003.
- Kurosaka M, et al. Maximizing flexion after total knee
arthroplasty. The needs and the pitfalls. J Arthroplasty 17(4) suppl
1. 2002.
- Lotke PA. The posterior cruciate ligament in total knee
arthroplasty: a commentary. University of Pennsylvania Orthopaedic
Journal. Vol 12: 109. 1999.
- Wright Medical Technology Report. Clinical survey of patient
satisfaction – A study of bilateral knee recipients. MK475-701.
- Schmidt R, Blaha JD, Penenberg BL, Maloney WJ, Komistek RD,
Fluoroscopic analyses of cruciate retaining and medial pivot knee
implants. Clin Orthop 410:139-147. 2003.
- Mahoney OM, Noble PC, Rhoads DD, Alexander JW and Tullos HS.
Posterior cruciate function following total knee arthroplasty: A
biomechanical study. J Arthroplasty, 9:569-78. 1994.
- Laskin R, O’Flynn H. Total knee replacement with posterior
cruciate ligament retention in rheumatoid arthritis. Clin Orthop
345:24-28. 1997.
- Nelson CL. Total knee arthroplasty with preservation of the
posterior cruciate ligament. University of Pennsylvania Orthopaedic
Journal. Vol 12:96- 99. 1999.
- Pritchett JW, Patient preferences in knee prostheses. JBJS (BR):
979-982, 2004.
- Schmidt R, Komistek R, et al., Fluoroscopic Analyses of Cruciate-Retaining
and Medial-Pivot Knee Implants. Clin Orthop Relat Res. 410:139-147.
2003.
- Font-Rodriguez DE, G. Scuderi, J. Insall, R. Windsor and M.
Moran: Survivorship of Cemented total knee arthroplasty., Clin
Orthop Relat Res. Dec;(345):79-86. 1997.
- Wright Engineering Report, ER010034.
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