From: No patella resurfacing total knee arthroplasty leads to reduction in the thickness of patellar cartilage to less than half within 5 years: a quantitative longitudinal evaluation using MRI
Knee Society grading scale
α
98.0 (3.2)
β
89.8 (2.6)
γ
3.9 (2.7)
δ
85.5 (3.0)
