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Charcot Reconstruction Preoperative Prognostic Score (CRPPS) of Rettedal et al

Description

Rettedal et al reported the Charcot Reconstruction Preoperative Prognostic Score (CRPSS) for evaluating a patient undergoing surgery to correct Charcot joint of the foot or ankle. The authors are from the University of Pittsburgh, Washington Foot and Ankle Specialists and CNOS (South Dakota).


Patient selection: Charcot neuroarthropathy of the foot or ankle

 

Outcome: negative if wound or major amputation at final follow-up visit

 

Parameters:

(1) age in years

(2) body mass index (BMI) in kg per square meter

(3) wound

(4) osteomyelitis

(5) anatomic location includes ankle

(6) active clinical disease

(7) hemoglobin A1c in percent

 

Parameter

Finding

Points

age in years

< 50 years

0

 

>= 50 years

1

BMI

< 30 kg per sq m

0

 

30 to 35

1

 

35 to 40

2

 

> 40 kg per sq m

3

wound

absent

0

 

present

1

osteomyelitis

absent

0

 

present

1

anatomic location

excludes ankle

0

 

includes ankle

1

active clinical disease

no

0

 

yes

1

hemoglobin A1c

< 8%

0

 

8 to 10%

1

 

> 10%

2

 

total score =

= SUM(points for all of the parameters)

 

Interpretation:

• minimum score: 0

• maximum score: 10

• A score >= 4 is associated with a negative outcome (OR 7.3).

 

Performance:

• The area under the ROC curve was 0.80.

• The sensitivity was 0.75 and specificity 0.71 at the cutoff.

 


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