Robotic Arm Assisted Total Knee Arthroplasty

Inclusion Criteria:

- Male or female subjects may be recruited in to the Investigation.

- Age - The subject must be at least 21 years of age and skeletally mature as
demonstrated radiographically by complete closure of the distal femoral and proximal
tibial epiphyses.

- Subjects who are able to give voluntary, written informed consent to participate in
this investigation and from whom consent has been obtained.

- Subjects who, in the opinion of the Investigators and Approved Study Staff, are able
to understand this Investigation and cooperate with the Investigation procedures and
are willing to comply with all the required post-operative follow-ups.

- Subjects who require a total knee arthroplasty for primary surgical management of
osteoarthritis, post-traumatic arthritis, rheumatoid arthritis, moderate deformities
or femoral condyle osteonecrosis as defined below.

- Osteoarthritis: Kellgren-Lawrence Grade 3 or higher, with clinical history of an
absence of major trauma to the joint; symptoms of pain, stiffness, swelling, and/or
loss of motion; and with radiographic evidence of joint space narrowing, sub-chondral
sclerosis, or peripheral osteophytes.

- Post-Traumatic Arthritis: Kellgren-Lawrence Grade 3 or higher, with a clinical
history of trauma to the targeted knee and subsequent pain, stiffness, swelling and
loss of motion; and with radiographic evidence of joint space narrowing, sub-chondral
sclerosis, or peripheral osteophytes.

- Rheumatoid Arthritis: American College of Rheumatology classification score of 6 or
higher, with a clinical history that demonstrates the following: morning stiffness
for at least 1 hour and present for at least 6 weeks, swelling, loss of motion,
and/or serum rheumatoid factor; and radiographic findings of narrow joint space,
peri-articular osteopenia, and/or per-articular erosions.

- Moderate Deformities: Moderate varus, valgus, flexion, or post-traumatic deformities
of no more than 15° assessed radiographically. Moderate recurvatum of no more than 8°
assessed radiographically.

- Femoral Condyle Osteonecrosis: Loss of blood supply in the femoral condyle
characterized by sudden onset of pain, possibly triggered by a specific seemingly
routine activity or minor injury. Pain is often increased with activity and at night
time and may cause swelling of the knee and sensitivity to touch and pressure and may
result in limited motion. Confirmed by a bone scan, MRI, and/or x-ray.

- Subjects whose anatomy is appropriate for the available range of implant sizes.

Exclusion Criteria:

- Patients who have had previous surgical procedures requiring implantation of hardware
in their operative side knee, hip, or ankle that would result in metal artifact
scatter in a CT scan.

- Patients who have a fracture malunion of the distal femur or proximal tibia within
12cm of the knee center, assessed radiographically.

- Patients who are pregnant, may become pregnant during the course of the
Investigation, or are currently lactating.

- Patients with allergies or suspected sensitivity to any patient-contacting component
of the investigational device or the implant to be used in the study as listed below:

- Femoral component: Cobalt Chromium alloy (CoCr)

- Tibial component: Titanium alloy (Ti6Al4V)

- Tibial inserts and patella component: Vitamin E infused ultra-high molecular weight
polyethylene (UHMWPE)

- Saw blade: 440C Stainless Steel

- Patients who require bilateral total knee arthroplasty.

- Patients who are currently on medical leave from their employment due to Workmen's
Compensation.

- Patients who are currently state or federal prisoners.

- Patients who are currently Wards of the state.

- Patients who are at high risk for poor healing or confounding outcomes or at
excessive risk for surgery i.e.: clinically significant/being actively treated for
renal, hepatic, cardiac, hematologic, or neurologic disease or poorly controlled
diabetes (HbA1c > 10 mg/dL) or previous history of joint infection.

- Patients who are known drug or alcohol abusers or with psychological disorders as
defined by DSM V that could affect follow-up care or treatment outcomes.

- Patients who are currently involved in another clinical study with an investigational
device.

- Patients with current litigation pending related to medical treatment of any sort.