Teres Minor exerts only average of 17.5% and 15.4% shoulder
external rotation force as compared to Infraspinatus
in both 0° and 90° abducted shoulder positions, respectively
(Hughes RE & An KN 1996).
Teres Minor activity is remarkably high during prone horizontal
abduction at 100° abduction with shoulder external rotation,
exhibiting similar activity as infraspinatus (Blackburn TA, et
al. 1990; Malanga GA, et al 1996).
Shoulder abduction angle does not affect external rotation
torque of Teres Minor. It has relatively constant external rotation
moment arm (approximately 2.1 cm) any degree of shoulder abduction
(Otis JC, et al. 1994).
Teres Minor can produce only very small scapular plane adduction
during maximal contraction (Hughes RE, An KN 1996) with adductor
moment arm of approximately 0.2 cm at 45° of shoulder internal
rotation and approximately 0.1 cm at 45° of shoulder external