Which of the following clinical scenarios is historically and classically considered an absolute contraindication for performing a medial unicompartmental knee arthroplasty (UKA)?

Explanation:
The correct option is d. Inflammatory arthropathies, such as Rheumatoid Arthritis, are absolute contraindications for UKA. Because these diseases are systemic autoimmune processes affecting the entire synovial lining, they will inevitably progress to destroy the unresurfaced lateral and patellofemoral compartments of the knee, leading to rapid clinical failure of the partial implant. Historically, high BMI, age, and patellofemoral changes were considered strict contraindications (Kozinn and Scott criteria), but modern literature and implant survivorship data have relaxed these, proving UKA can be highly successful in older, heavier patients and those with mild asymptomatic patellofemoral arthritis. Reference: Kozinn SC, Scott R. Unicondylar knee arthroplasty. J Bone Joint Surg Am.