11-2 Orthopedics
11.3 Orthopedics Measurement Tools
NOTE: Measurement tools mentioned below are configured in the system. The application
measurement packages provided in this system are generally different combinations of
measurement tools. For more information about package preset, see "2.4.2.2 Application
Measurement Preset".
HIP
The HIP calculation assists in assessing the development of the infant hip. In this calculation, three
straight lines are superimposed on the image and aligned with the anatomical features. The two
angles are calculated and displayed.
The three lines are:
The baseline (BL), connecting the osseous acetabular convexity to the point where the joint
capsule and the perichondrium unite with the ilium.
The roof line (RL), connecting the lower edge of the ilium to the osseous acetabular convexity.
The inclination line (IL), connecting the osseous acetabular convexity to the labrum acetabular.
The angles are:
α: the angle between BL and RL.
β: the angle between BL and IL
Dislocation type can be determined through Graf method, as described in the following table.
DISLOCATION
TYPE
CRITERIA
RESULT
α β Patient
I
α≥60°
β＜77°
All ages I
II
50°≤α≤59°
Younger than three months of
age
IIa
50°≤α≤59°
β＜55°
Three months of age or older
than three months
IIb
43°≤α≤49° β≤77°
All ages IIc
43°≤α≤49°
β＞77°
All ages
IId
III
α＜43° β＞77°
All ages
III
IV
Quantitative angle
measurement cannot be
performed.
All ages
All
Others Others All ages ?????
α
β
BL
RL
IL
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