Information will be collected on the pre-op and post-op clinical status of patients with focal cartilage defects of the femoral condyles treated with the BioPoly RS Partial Resurfacing Knee Implant, a permanent orthopaedic implant. The overall aim of the study is to increase the knowledge of patient outcomes such as pain, knee function, level of activity, and overall quality of life after treatment with the device.

Information will be collected on the pre-op and post-op clinical status of patients with focal cartilage defects of the femoral condyles treated with the BioPoly RS Partial Resurfacing Knee Implant, a permanent orthopaedic implant. The overall aim of the study is to increase the knowledge of patient outcomes such as pain, knee function, level of activity, and overall quality of life after treatment with the device. Patients will be followed for 5 years after surgery.

Inclusion Criteria:

• Cartilage lesion located in weight bearing region of medial or lateral femoral condyles that have failed prior therapy (conservative or surgical)
• Lesion classified as ICRS Grade 2, 3, or 4

Exclusion Criteria:

• Body mass index (BMI) of 30 or more
• Osteoarthritis or rheumatoid arthritis
• Gout
• Uncorrected mal-alignment, ligamentous instability, or meniscal tear
• Total meniscectomy
• Kissing lesion on tibia