Table 2.

Regression equations for the patellar tendon moment arm (PTMA) length in the adults

	Angle (°)	Equation	R2 value
Eq. 1	55	PTMA = 3.26 + 0.019 M	0.41
Eq. 2	60	PTMA = 3.21 + 0.019 M	0.47
Eq. 3	65	PTMA = 4.661 + 0.024 M – 0.171 KNEEB	0.49
Eq. 4	70	PTMA = 3.283 + 0.016 M	0.4
Eq. 5	75	PTMA = 3.188 + 0.017 M	0.43
Eq. 6	80	PTMA = 4.411 + 0.025 M – 0.167 KNEEB	0.5
Eq. 7	85	PTMA = 3.185 + 0.016 M	0.4
Eq. 8	90	PTMA = 1.571 + 0.222 KNEED	0.27

M, body mass; KNEEB, medio-lateral knee breadth; KNEED, anterior-posterior knee depth.