Axis of upper limb passes through
Mechanical axis It is defined as the straight line connecting the joint center points of the proximal and distal joints. The mechanical axis is always a straight line, whether in the frontal or sagittal plane. Anatomic 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. ref : maheswari 9th ed
Capitulum
Trochlea
Olecranon
Radial styloid
Forearm wrist and hand injuries