Paxton et al evaluated patients following a primary total hip replacement. They identified risk factors for revision of the arthroplasty. The authors are from Kaiser Permanente in San Diego and West Los Angeles.
Patient selection: primary total hip replacement
Outcome: revision within 5 years
Parameters:
(1) age in years
(2) sex
(3) osteoarthritis
(4) body mass index (BMI) in kilograms per square meter
Parameters
Finding
Points
age in years
-0.01742 * (age)
sex
male
0
female
0.215285
osteoarthritis
no
0
yes
-0.16622
body mass index
0.067322 * SQRT(BMI)
X =
= SUM(points for the 4 parameters) - 2.66834
probability of hip revision within 5 years =
= 1 / (1 + EXP((-1) * X))
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