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TABLE–8:
Regression Equation at Different Joints
JIAFM, 2007 - 29(4); ISSN: 0971-0973
Joint studied
Elbow
Wrist
Knee
Pelvis
Regression Equation
Female
18.54+(0)X
11.58+1.9X
Y=18.74+(0)X
Y=15.93+0.89X
Table–9:
Standard errors at different joints
Joint studied
Standard Error
Elbow 4.14
Wrist 1.73
Knee 4.14
Pelvis 1.65
The regression equations for 16 to 22 years age group at different joints to predict ages with given degrees of
union is shown in Table-8, where Y is the dependent variable (age) and X is an independent variable (degree of
union). The standard errors of various joints are given in Table-9 which corresponds to the different regression
equations. There was no appreciable difference in the age of complete union of epiphysis on both right and left
side of the body.
Regarding the individual bones of the joints concerned, the ages showing complete epiphyseal union in the 100%
of the cases at the earliest has been summarized below:
Conjoint epiphysis 16 years; Medial epicondyle of humerus 16 years
Upper end of radius 16 years; Upper end of ulna 16 years
Lower end of radius 18 years; Lower end of ulna 18 years
Lower end of femur 17 years; Upper end of tibia 17 years
Upper end of fibula 17 years; Ischial tuberosity 21 years
Iliac crest
21 years;
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