What is the mechanical axis of bone?

Question

Question

This question was previously asked in

UGC NET Paper 2: Physcial Education 11 July 2022 Shift 1

Answer 1

Explanation:

Mechanical axis:

The mechanical axis of a bone is a straight line connecting the joint center points of the proximal and distal joint regions, whether in the frontal or sagittal plane.
Example:
- The mechanical axis of the tibia was defined as a line connecting the center of the knee and the center of the talus.

Anatomical axis:

The anatomic axis of a bone is the mid-diaphyseal line.
The anatomic axis line may be straight in the frontal plane but curved in the sagittal plane, as in the femur.
Example:
- The anatomic axis of the femur and the anatomic axis of the tibia were respectively defined as lines drawn along the length of the intramedullary canals of the femur and the tibia.

Thus, the mechanical axis of the bone is a straight line that passes from the midpoints of proximal and distal ends.

Additional Information:

Planes and Axis:

Human movements are described in three dimensions based on a series of planes and axis.
There are three planes of motion that pass through the human body.
- The sagittal plane
- The frontal plane
- The transverse (horizontal) plane
The sagittal plane lies vertically and divides the body into right and left parts.
The frontal plane also lies vertically and divides the body into anterior and posterior parts.
The transverse plane lies horizontally and divides the body into superior and inferior parts.

Axis:

An axis is a straight line around which an object rotates.
Movement at a joint takes place in a plane about an axis.
There are three axes of rotation.
- Sagittal axis
- Frontal axis
- Vertical axis
The sagittal axis passes horizontally from posterior to anterior and is formed by the intersection of the sagittal and transverse planes.
The frontal axis passes horizontally from left to right and is formed by the intersection of the frontal and transverse planes.
The vertical axis passes vertically from inferior to superior and is formed by the intersection of the sagittal and frontal planes