Fig. 4From: Predominance of synovial sensory nerve fibers in arthrofibrosis following total knee arthroplasty compared to osteoarthritis of the kneeDensity of sympathetic tyrosine hydroxylase-positive (TH+) and sensory substance P-positive (SP+) nerve fibers in infrapatellar fat pad in patients with osteoarthritis (OA) and arthrofibrosis (AF). Box plots are explained in the legend of Fig. 2. n.s. not significantBack to article page