Axis of upper limb passes through: (A) Capitulum, (B) Trochlea, (C) Olecranon, (D) Radial styloid
Answer is A. 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