Anatomic localization of motor points of hip adductors

Kwon J-Y, Kim J-S, Lee Wl: Anatomic localization of motor points of hip adductors. Am J Phys Med Rehabil 2009;88:336-341. Objective: To identify the precise location of the motor points of hip adductors in relation to bony landmarks. Design: Nineteen fimbs from ten adult cadavers were anatomically dissected. The motor point of each adductor muscle was determined by measuring its distance from the pubic tubercle with reference to a line joining the pubic tubercle and the medial epicondyle of the femur, and this distance was expressed as a percentage. For describing the mediolateral relationship between the motor point of each adductor and bony landmarks, its distance from the pubic tubercle was measured with reference to a line joining the pubic tubercle and the greater trochanter of the femur, and the result was expressed as a percentage. Results: The percent distances along the longitudinal reference line distal to the pubic tubercle were as follows: adductor longus, 26.0% ± 4.8%; adductor brevis, 21.0% ± 4.8%; gracilis, 32.1% ± 2.1%; and adductor magnus, 30.4% ± 4.1%. Further, the percent distances along the horizontal reference line lateral to the pubic tubercle were as follows: adductor longus, 24.9% ± 7.8%; adductor brevis, 24.9% ± 7.4%; and adductor magnus, 33.6% ± 5.9%. Conclusions: Identification of these motor points facilitates the efficacy and efficiency of a neural blockade and decreases undesirable complications.