Hip joint problems can also cause pain that occurs in other areas, not just the groin. The groin is the most common location for hip joint pain, but pain can also occur in the back of the hip (the buttocks), the thigh, and even in the knee.
Midsagittal plane. Definition. noun. (anatomy) A plane passing vertically through the midline, dividing the body into left and right halves of equal proportion (i.e. in the case of bilateral symmetry). Supplement. In human body, a median plane is a sagittal plane passing through the midline structures such as the navel and spine.
1 The midsagittal (median) plane is in the midline through the center of the body and all other sagittal planes are parallel to it.  The coronal plane (frontal or Y-X plane): divides the body into dorsal and ventral (back and front) portions. It also separates the anterior and posterior portions.