A
Inflammatory arthropathy (e.g., Rheumatoid arthritis)
B
Patient age over 80 years
C
Body Mass Index (BMI) of 32
D
Previous partial medial meniscectomy
Explanation:Correct Option: A. Inflammatory arthropathies, such as rheumatoid arthritis, are absolute contraindications for UKA because the disease process is systemic and will symmetrically destroy the retained compartments over time. Age, moderate obesity, and prior meniscectomy are not absolute contraindications under modern criteria. (Ref: Kozinn and Scott, J Bone Joint Surg Am, 1989)