In This SectionTexas Health Research & Education Institute
Disease or Condition
Osteoarthritis / Knee Replacement
A Randomized Clinical Study to Compare the Safety and Efficacy of the Oxford Cementless Partial Knee System (Osteopedics / Knee Replacement)
The objective of this clinical investigation is to evaluate the safety and efectiveness of the Oxford Cementless Partial Knee System.
Patients with a pre-operative Knee Society Assessment Score of <70.
Patients undergoing primary partial knee arthroplasty as unilateral arthroplasty or bilateral arthroplasty, simultaneously or otherwise.
Patients diagnosed with osteoarthritis or avascular necrosis limited to the medial compartment of the operative knee joint.
Male or Female patients who are at least 21 years of age at the time of surgery.
Patients with full thickness cartilage loss, with or without bone loss in the medial compartment.
Patients with functionally intact ACL and PCL.
Patients who need to obtain relief of pain and/or improved function in their knee.
Patients with fixed flexion deformity < 15°.
Patients who are able to follow post operative care instructions.
Patients who are willing and able to return for scheduled follow-up evaluations.
Patients in which natural alignment can be restored.
Patients who have completed a valid, IRB approved Informed Consent Form.
Patients with child bearing potential who voluntarily agree to prevent pregnancy for 2 years following device implantation.
Patients with a pre-operative Knee Society Assessment Score of = 70.
Patients in which the device would be used to revise a failed prosthesis.
Patients who are less than 21 years of age at the time of surgery.
Disease or damage to the lateral part of the knee that in the investigator’s opinion contraindicates a partial knee replacement.
Patients diagnosed with rheumatoid arthritis or other forms of inflammatory joint disease.
Patients diagnosed with a failed upper tibial osteotomy in the operative knee.
Patients diagnosed with post-traumatic arthritis after tibial plateau fracture.
Patients who have had a patellectomy.
Patients with a flexion deformity > 15°.
Patients with a fixed varus deformity > 15°.
Patients who have rapid joint destruction, marked bone loss or bone resorption apparent on roentgenogram.
Patients with a fused knee on operative side.
Patients who have active or suspected infection, local or systemic that, in the opinion of the investigator, may put patients at undue risk.
Patients with pre-existing condition(s) that may interfere with the survival of the implants or their outcomes, including: Sickle Cell Anemia, lower extremity muscular atrophy, neuromuscular disease, vascular insufficiency, metabolic disorders which impair bone formation, Paget’s Disease, Charcot’s Disease, Osteomalacia, severe Osteoporosis.
Patients with clinical conditions that may limit follow-up (in the opinion of the investigator) including: immuno-compromised conditions (i.e. HIV), Hepatitis, Tuberculosis, neoplastic disease such as cancer of the prostate, lung, stomach, cervix, etc.
Chronic renal failure.
Organ transplant (i.e. heart, liver, lung, etc.) recipients.
Known disease process that in the opinion of the investigator may limit long term (4 year) follow up (i.e. multiple sclerosis, leukemia, lymphoma, etc.)
Patients diagnosed with Parkinson’s or Alzheimer’s Disease.
Patients who have had an above-knee amputation in the contralateral leg.
Instability or deformity of the ligaments and/or surrounding soft tissue, which would preclude stability of the prostheses.
Patients with a known metal allergy.
Prisoners or, individuals who are known to be abusing drugs or alcohol or are mentally incompetent.
Patients who have received systemic steroids within the past 6 months or steroid injection into the affected knee within the previous 6 weeks prior to enrollment.
Patients who are pregnant.
Patients with severe valgus or varus knees (valgus or varus angulation of more than 20°) where collateral ligament, iliotibial band, or popliteal release is required.
Patients who refuse to sign the IRB approved Informed Consent Form.
Participation in an interventional clinical research study procedure, other than a bilateral knee arthroplasty in this study, within the past 12 months.
Patients with a history of osteomyelitis or sepsis of the index knee.
Patients who require patellar resurfacing.
Patients who are not skeletally mature.
Patients who have had a total hip replacement procedure <18 months prior to entering the study.
Patients who have had a contralateral non-study knee replacement procedure <18 months prior to entering the study.
Patients who are found intraoperatively to have inadequate bone stock or other conditions that contraindicate a partial knee replacement.
NOTE: Patients implanted on the contralateral knee with the investigational or control device as part of their participation in the study are permitted to be enrolled in the study, but will receive a matching device to the original study knee and will not be randomized.