glenoidplanefitting.algorithms.friedman module

This is an implentation of Friedman’s method, see

Friedman RJ, Hawthorne KB and Genez BM. The use of computerized tomography in the measurement of glenoid version. J Bone and Joint Surg Am 1992; 74: 1032–7.

glenoidplanefitting.algorithms.friedman.create_friedman_line(point0, point1)

Determines the second point needed to form the Friedman line

Parameters

• point0 – First point on glenoid line, anatomically defined as a point on the anterior margin of glenoid

• point1 – Second point on glenoid line anatomically defined as a point on the posterior margin of glenoid

Raises

Value Error if the z values of point0 and point1 are not equal

Returns

The midpoint of the glenoid line, which is the second point of the Friedman line

glenoidplanefitting.algorithms.friedman.friedman_version(glenoid0, friedman1, friedman0)

Determines the glenoid version using the Friedman line

Parameters

• glenoid0 – First point on glenoid line, anatomically defined as a point on the anterior margin of the glenoid

• friedman1 – Second point on the Friedman line, anatomically defined as the midpoint of the glenoid fossa

• friedman0 – First point on the Friedman line, anatomically defined as the medial tip of the scapula

Returns

The glenoid version (positive value indicates retroversion)