Hoch Armando, Dimitriou Dimitris, Wolf-Wettstein Jessica, Rosner Jan, Schubert Martin, Aguirre Jose, Eichenberger Urs, Zingg Patrick, Borbas Paul
Balgrist University Hospital, University of Zurich, Zurich, Switzerland.
J Orthop Res. 2025 Apr;43(4):828-833. doi: 10.1002/jor.26036. Epub 2024 Dec 28.
Hip abductors are essential for hip function. To understand abduction weakness, it is important to know which muscles contribute to abduction force. Our aim was to investigate the effects of an experimentally induced weakness of the different muscles (tensor fasciae latae [TFL], gluteus medius and minimus (Gmed/min), gluteus maximus [Gmax]) on the abduction force. Ten participants received sequential nerve blocks of the TFL, the Gmed/min, and the Gmax. Subsequently, abduction force was measured in the lateral decubitus position in three sagittal positions of the hip (30° flexion, neutral, 30° extension). In 30° flexion, the average abduction force was 220 N without block, 187 N with block of the TFL, 83 N with block of the Gmed/min, and 97 N with block of the Gmax, respectively. In neutral position, average abduction force was 213 N without block, 200 N with block of the TFL, 82 N with block of the Gmed/min, and 115 N with block of the Gmax, respectively. In 30° extension, average abduction force was 116 N without block, 146 N with block of TFL, 61 N with block of the Gmed/min, and 94 N with block of the Gmax, respectively. An induced weakness of the TFL reduces abduction force only in 30° of hip flexion by 15%. It is not highly relevant as an abductor. An induced weakness of the Gmax reduces abduction force in flexion by 43%-56%, depending on the position. It is, therefore, highly relevant as an abductor of the hip.
髋外展肌对髋关节功能至关重要。为了解外展肌无力的情况，了解哪些肌肉产生外展力很重要。我们的目的是研究不同肌肉（阔筋膜张肌 [TFL]、臀中肌和臀小肌 [Gmed/min]、臀大肌 [Gmax]）实验性诱导无力对外展力的影响。10名参与者接受了TFL、Gmed/min和Gmax的序贯神经阻滞。随后，在髋关节的三个矢状位（30°屈曲、中立位、30°伸展）的侧卧位测量外展力。在30°屈曲位，无阻滞时平均外展力为220N，TFL阻滞时为187N，Gmed/min阻滞时为83N，Gmax阻滞时为97N。在中立位，无阻滞时平均外展力为213N，TFL阻滞时为200N，Gmed/min阻滞时为82N，Gmax阻滞时为115N。在30°伸展位，无阻滞时平均外展力为116N，TFL阻滞时为146N，Gmed/min阻滞时为61N，Gmax阻滞时为94N。TFL的诱导性无力仅在髋关节30°屈曲时使外展力降低15%。作为外展肌，其相关性不高。Gmax的诱导性无力在屈曲时使外展力降低43%-56%，具体取决于位置。因此，它作为髋关节的外展肌相关性很高。
