Hip and Knee Replacement Parts and Materials
The prosthetic parts and materials used in knee and hip replacement procedures are an important part of a successful outcome. The right implant can restore optimal range of motion, and high quality, patient-proven materials can reduce risk of complications and the need for additional procedures.
While many of the components used today stem from some of the first introduced decades ago, research studies on the wear and longevity of materials and long term patient outcomes contribute to the ongoing refinement of hip and knee replacement systems.
Dr. Incavo’s dedication to research has resulted in many published articles and book chapters on this subject. His ongoing research continues to assess long-term wear of hip and knee replacement systems, the best surgical approach for individual patients and the impact of prosthetic parts and materials on patient quality of life.
Total Hip Replacement Implants
This represents some of the hip replacement implants commonly used and offered by different medical device companies. Dr. Incavo consults with each patient and selects the best system for their particular need, demonstrating their function and detailing their components and the scope of the procedure beore scheduling surgery.
Hip Replacement Systems:
(1A) Conventional titanium cementless femoral stem and modular (removable) ceramic head, which articulates with a titanium acetabular shell and polyethylene liner.
(This is currently the bearing combination of choice for most patients. The other designs shown below have had documented problems with the bearing surface.)
(1B) Large metal head articulating with a cobalt-chrome acetabular shell with no intervening polyethylene. This is termed a metal-on-metal (MoM) total hip replacement (THR).
(1C) Modular neck femoral stem design.
(1D) Large diameter metal head on a trunnion.
Knee Replacement Implants
Knee replacement implants include total knee replacement (TKR) systems, partial knee replacement (PKR) systems and revision knee replacement systems and components. There are three components to a total knee implant, replacing three bone surfaces – femoral, tibial and patellar implants. The components weigh a total of between 10 to 15 ounces.
The materials used in knee replacements systems are designed to always permit a metal component to move against plastic or other synthetic material, promoting smooth movement that minimizes wear. The metal parts of the implant are usually created from titanium or cobalt/chromium-based alloys. The plastic parts are an ultrahigh-molecular weight polyethylene.
The type of procedure and knee replacement system best for each patient is determined after an extensive medial assessment and consultation with the patient.
Dr. Incavo carefully explains the recommended procedure to the patient, from pre surgery preparation to recovery and post surgical care and rehabilitation. He demonstrates the prosthetic parts and materials to be used and answers all questions a patient has prior to surgery.
|Evolution™ Medial-Pivot Knee System
(eMP™ Knee System)
|Advance™ Medial-Pivot Knee System
(aMP™ Knee System)
All MicroPort Medial-Pivot total knee implants feature:
- Ball-in-socket articulation, enhancing stability and allowing the prosthesis to move and feel more like a normal knee
- Delivers flexion stability, anatomic motion and wear limiting design.
Smith & Nephew
The LEGION◊ Total Knee System is a comprehensive system designed to allow surgeons to address primary to complex revision knee arthroplasty. Its unique implant design features, proprietary materials* and intuitive instrumentation.
LEGION◊ Hinged Knee is an extension of the LEGION Total Knee System.
The GENESIS◊ II Total Knee System features instrumentation, such as the user-friendly MIS system and the ream-thru femoral trials designed to create a comprehensive system.
*VERILAST technology combines an OXINIUM◊Oxidized Zirconium femoral component with a highly crosslinked ultra-high molecular weight polyethylene (UHM-WPE) tibial insert to form an advanced TKA bearing.
Total Knee Replacement (TKR) Systems
The Persona Knee System features include:
- Innovative anatomic and morphologic knee implant designs
- Comprehensive sizing with tighter increments
- Side-specific tibiofemoral articulation
- Side-specific kinematics with differential conformity articulation
- Cruciate retaining and posterior stabilized philosophies
- “Active stabilization” Vitamin-E grafted polyethylene (formulated to balance and maintain mechanical strength, low wear and oxidation resistance for the long term)
- Trabecular Metal™ Technology is a unique, highly porous biomaterial made from elemental tantalum with structural, functional, and physiological properties similar to that of bone.1 (reducing wear, and maintaining bone quality)
- The anatomic tibial component improved backside wear performance due to locking mechanism and surface finish that virtually eliminates micromotion
Bobyn JD, Hacking SA, Chan SP, et al. Characterization of new porous tantalum biomaterial for reconstructive orthopaedics. Scientific Exhibition: 66th Annual Meeting of the American Academy of Orthopaedic Surgeons; 1999; Anaheim, CA.
Partial Knee Replacement (PKR) System
- Unicompartmental systems are designed to provide patients a joint preservation option for unresolved patello-femoral pain, with the same proprietary materials as the total knee replacement systems.
- The partial knee replacement systems also address the differences between the male and female femur.