This study seeks to find out if the tibial and patellar components of the Stryker Triathlon
Tritanium primary total knee replacement achieve adequate fixation to the underlying bone.
The investigators expect the tibial and patellar components of the Stryker Triathlon
Tritanium knee to achieve adequate fixation to the underlying bone.
The investigators expect that there will be no continuous migration between one and two
years post-operative in the Triathlon Tritanium components.
The investigators expect to see a correlation between radiolucent lines and migration
characteristics using RSA.
The investigators expect that inducible displacement exams taken at 2 years post-operative
will be able to distinguish between patients identified by RSA measurements as having
The investigators expect to see a significant difference in health status and functional
outcomes before and after total knee replacement using the Triathlon Tritanium knee.
- Symptomatic osteoarthritis of the knee indicating surgical intervention
- Scheduled to undergo a total knee arthroplasty
- Patients between the ages of 18 and 80, inclusive
- Patient is a candidate for Triathlon Tritanium cementless knee components implanted
in accordance with product labeling
- Significant co-morbidity affecting ability to ambulate
- Prior arthroplasty, patellectomy or osteotomy with the affected knee
- Active or prior infection of the affected knee
- Morbid obesity (BMI > 40)
- Medical condition precluding major surgery
- Severe osteoporosis
- Neuromuscular impairment
- Inability to give informed consent
- Inability to return for follow-up visits for a minimum of two years after surgery
- Currently participating in any other surgical intervention study
- Known allergy to metals
- Flexion contracture greater than 15°
- Extension lag greater than 10°
- Tibial subluxation greater than 10 mm on standing AP radiograph
- Lateral or medial collateral ligament instability (> 10° varus/valgus)
- Leg length discrepancy greater than 10 mm