Does Clinically Important Change in Function After Knee Replacement Guarantee Good Absolute Function? The Multicenter Osteoarthritis Study

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Figure 1.
Proportion of subjects attaining each measure of post–total knee replacement function by baseline function score. MCII: minimal clinically important improvement; PASS: Patient Acceptable Symptom State; KR: knee replacement; WOMAC-PF: Western Ontario and McMaster Universities Osteoarthritis Index Physical Function subscale.

Table 1.

Demographic and pre-total knee replacement (TKR) clinical information of the study subjects.

No. subjects	228
Mean age at TKR, yrs (SD)	67 (8)
% Female	73
% White	85
Pre-TKR BMI, kg/m², mean (SD)	33 (7)
Pre-TKR WOMAC-PF, mean (range)	30 (15–63)
Time since pre-TKR visit to TKR, mos, mean (SD)	16 (10)
Time since TKR to outcome assessment, mos, mean (SD)	15 (9)
Percent at or above PASS for TKR function (pre-TKR)	26

BMI: body mass index; WOMAC-PF: Western Ontario and McMaster Universities Osteoarthritis Index Physical Function subscale; PASS: Patient Acceptable Symptom State.

Table 2.

Proportion of subjects by combination of post–total knee replacement (TKR) outcomes, and demographics of each group.

	Attained PASS for TKR	Did Not Attain PASS for TKR
Attained MCII	41% (69% women, 92% white, 16% > 75 yrs old)	3% (100% women, 57% white, 0% > 75 yrs old)
Did not attain MCII	30% (74% women, 85% white, 12% > 75 yrs old)	26% (73% women, 81% white, 20% > 75 yrs old)