Proximal humeral joint orientation line

The proximal humeral joint orientation line is a landmark used to assess angular deformities of the humerus and provide indications for their correction.

• In the frontal plane, it is determined from a craniocaudal radiograph or multiplanar reconstruction of the humerus: it corresponds to the line connecting the proximal part of the greater tubercle to the line tangential to the head of humerus.

• In the sagittal plane, it is determined from a mediolateral radiograph or from a multiplanar reconstruction of the humerus (the circles that best fit the medial and lateral parts of the condyle of humerus must be concentric and not intersect): it corresponds to the line joining the cranioproximal part of the greater tubercle to the caudodistal part of the head of humerus.