Translatory hip kinematics measured with optoelectronic surgical navigation

Abstract

We found subtle but definite translations in every cadaver hip. There was no consistent pattern of translation. It is possible to use the surgical navigation systems for the assessment of human hip kinematics intra-operatively and improve the treatment of total hip arthroplasty patients by the knowledge of the fact that their hips translate. Better procedure selection and implantation optimization may arise from improved understanding of the motion of this critically important human joint.

Experimental modification of morphology reveals the effects of the zygosphene-zygantrum joint on the range of motion of snake vertebrae

“…The lack of a zygosphene in other limbless tetrapods is puzzling, and may be due to evolutionary trade-offs, constraints or contingency. Presumably, limbless lizards must limit ROM using either soft tissue structures, which are vulnerable to injury, or modifications of existing vertebral processes, which may reduce ROM (Anderson et al, 2001;Johnston and Smidt, 1970;Kazár and Relovszky, 1969;Scopp and Moorman, 2001;Veeger and van der Helm, 2007;Zakani et al, 2017). More research is needed to determine how limbless lizards limit roll and measure how their overall ROM compares with that of snakes.…”

“…Joints with minimal bony constraints, such as the human shoulder, have a high range of motion (ROM) but also rely upon soft tissue for support, resulting in a higher injury risk (Kazár and Relovszky, 1969;Veeger and van der Helm, 2007). By contrast, joints with substantial bony constraints, such as the human hip, have moderate to minimal soft tissue support and a correspondingly lower ROM and injury rate (Anderson et al, 2001;Johnston and Smidt, 1970;Scopp and Moorman, 2001;Zakani et al, 2017).…”

“…All extant tetrapod vertebrae articulate via the centra and pre-and post-zygapophysis joints that maintain vertebral connection and provide stability (Sumida, 1997). As in other joints, there is a trade-off between stability and flexibility, depending on the needs of the animal (Anderson et al, 2001;Johnston and Smidt, 1970;Kazár and Relovszky, 1969;Scopp and Moorman, 2001;Veeger and van der Helm, 2007;Zakani et al, 2017). Limbless species often rely on the vertebral column for propulsion, and enhanced axial flexibility probably benefits the locomotion of terrestrial limbless animals by allowing them to make contact with and conform to a wide variety of shapes and sizes of surfaces that are used to generate propulsive forces.…”

Ultrasound Observation of Hip Translational Motion in Adolescent Dancers

“…Sarah Jackson, MD, RMSK, CSCS, Kristin E. Whitney, MD, MA, Corey J. Lanois, MS, ATC, Yi-Meng Yen, MD, PhD, Michael Owen, and Pierre d'Hemecourt, MD, RMSK Hip translational motion has been demonstrated using several imaging modalities, including radiographic measurements, positional magnetic resonance imaging (MRI), computed tomography (CT), and more recently dynamic ultrasound. [7][8][9][10][11] Ultrasound offers an advantage over other imaging modalities for screening due to its portability, relative affordability, and real-time motion detection. Rodriguez et al 12 recently described benefits of ultrasound as an adjunct to hip screening in dancers.…”

A study on the vertebral column of the dice snake Natrix tessellata (Serpentes, Natricidae) from Denizli (western Anatolia, Turkey)

“…The vertebral column plays a vital role in protecting the spinal cord while connecting the cranial and appendicular components of the skeletal system in tetrapods. This connection is achieved through the centra and pre‐ and post‐zygapophysis joints, which balance stability and flexibility according to the animal's needs (Anderson et al, 2001; Sumida, 1997; Zakani et al, 2017). In animals without limbs, such as snakes, the vertebral column plays a crucial role in the movement and adaptation to various surfaces.…”