. 2009 Mar 9;4(3):e4742. doi: 10.1371/journal.pone.0004742

Table 3. Glenoid cavity, femoral head and humeral head allometry.

Comparison	a	95% CI
Femoral head radius ∝ femoral length^a	1.26*	1.10–1.46
Femoral head radius ∝ femoral midshaft diameter^a	1.12	1.00–1.24
Humeral head radius ∝ humeral length^a	1.34*	1.17–1.54
Humeral head radius ∝ femoral head radius^a	1.08	0.99–1.18
Humeral head radius ∝ humeral midshaft diameter^a	1.01	0.90–1.12
Glenoid radius ∝ humeral head radius^a	1.15	1.03–1.28
Glenoid radius ∝ scapular length^a	1.48*	1.28–1.71

Scaling exponents (a) and 95% confidence intervals (CI) for femoral head, humeral head and glenoid cavity spherical radii against bone lengths and diameters. The strongest allometry is evident between articular radii and bone lengths (*), which are strongly related to body size.

Isometry: a = 1.0.