Scorpio® Cruciate Retaining (CR) Outcomes Study

The study design is a prospective, multi-center clinical trial. The Scorpio® Cruciate
Retaining (CR) Total Knee System is to be implanted for evaluation in this study. This device
system is commercially available and is intended for cemented use.

The study group will consist of a maximum of 265 cases, requiring primary total knee
replacement, and diagnosed with non-inflammatory arthritis. All subjects will be implanted
with a femoral component, a tibial insert, a tibial tray and a resurfaced patella. Subjects
receiving bilateral total knee replacements will represent two cases. Study participants will
be recruited from 5 institutions.

Subjects will be evaluated preoperatively and at follow-up intervals of 7 wks (± 2 wks), 3
months (± 3 weeks), 6 months (optional visit), 12 months (± 2 months) and annually thereafter
(± 2 months). Each subject will be followed for 15 years post-implantation.

The objectives of this study are to:

1. Evaluate the effect of system component design on functional performance.

2. Evaluate the effect of system component design by comparing postoperative functional and
radiographic findings with preoperative.

3. Evaluate complications and the rates in which they occur.

Inclusion Criteria:

1. The subject is a male or non-pregnant female between the ages of 21-80.

2. The subject requires a primary cemented total knee replacement.

3. The subject has a diagnosis of osteoarthritis (OA), traumatic arthritis (TA), or
avascular necrosis (AVN).

4. The subject has intact collateral ligaments.

5. The subject has signed the IRB approved, study specific Informed Patient Consent Form.

6. The subject is willing and able to comply with postoperative scheduled clinical and
radiographic evaluations and rehabilitation.

Exclusion Criteria:

1. Patient has inflammatory arthritis.

2. The subject is morbidly obese, >60% over ideal body weight for frame and height.

3. The subject has a history of total or unicompartmental reconstruction of the affected
joint.

4. Patient has had a high tibial osteotomy or femoral osteotomy.

5. The subject has a neuromuscular or neurosensory deficiency, which would limit the
ability to assess the performance of the device.

6. The subject has a systemic or metabolic disorder leading to progressive bone
deterioration.

7. The subject is immunologically suppressed, or receiving steroids in excess of normal
physiological requirements.

8. The subject's bone stock is compromised by disease or infection which cannot provide
adequate support and/or fixation to the prosthesis.

9. The subject has had a knee fusion to the affected joint.

10. The subject has an active or suspected latent infection in or about the knee joint.

11. The subject is a prisoner.

12. The subject is pregnant.