Morphology of Parsons' knob
The average width of the knob was 11.5 ± 3.1 mm (range, 10.5–12.2 mm). The average height of the knob was 1.2 ± 0.3 mm (range, 0.9–1.4 mm) at the most medial portion, 0.2 ± 0.3 mm (range, 0.1–0.8 mm) at the most lateral portion, and 1.2 ± 0.3 mm (range, 1.0–1.4 mm) at the intermediate portion between them. Both the medial and intermediate portions of the knob were significantly higher than the lateral portion (p < 0.05; Table 2).
Table 2.