Patients with orthopaedic and medical co-morbidities that would thwart postoperative pain control such as extra-articular pathology with referred pain to the knee (spinal stenosis, neuropathy,ipsilateral hip disease), severe knee deformity, post-traumatic and inflammatory arthritis Patients with chronic pain disorders BMI > 40 ASA class > III GI bleed within 6 months of surgery History of drug or alcohol abuse Patients unable to receive multimodal pain remitting agents including Celecoxib and Pregabalin.