Figure 3 Innervation of the articular cartilage occurs across the range of Mankin scores in patients with osteoarthritis. Number of cases classified as either positive or negative for protein gene product 9.5‐immunoreactive nerves in the non‐calcified articular cartilage, plotted against their Mankin scores. Nerves were distributed across the range of Mankin scores, with similar ranges for both sensory (median = 8, range 5–10) and sympathetic (median = 6.5, range 5–9) nerves (not shown in figure).