Can patients help with long-term total knee arthroplasty surveillance? Comparison of the American Knee Society Score self-report and surgeon assessment
Open Access
- 23 December 2008
- journal article
- research article
- Published by Oxford University Press (OUP) in Rheumatology
- Vol. 48 (2), 160-164
- https://doi.org/10.1093/rheumatology/ken439
Abstract
Objectives. To compare patient self-report of knee flexion, extension, range of motion (ROM) and American Knee Society (AKS) Pain, Knee and Functional scores with a clinician assessment. Methods. A total of 239 consecutive total knee arthroplasty (TKA) patients (290 knees) were mailed surveys with an AKS questionnaire and lateral knee photographs that showed knee ROM in 10° increments to compare their operated knee(s) ROM. Patients were subsequently seen in clinic and their ROM, AKS Pain, Knee and Functional scores were measured. Patient- and physician-reported measures were compared using independent sample t-test and correlated using Spearman's correlation coefficient. A priori rules for comparisons were based on previously published reports. Results. A total of 286 knees had both survey and clinic data available and constituted the analytic set. Patient-reported and physician-assessed extension, flexion and ROM were: 3 ± 4.8° vs 1.4 ± 4.3° (P < 0.001), 111.4 ± 14.6° vs 110 ± 12.8° (P = 0.04) and 108.6 ± 16.8 vs 108.6 ± 14.3° (P = 0.98). There was a moderate correlation between patient and physician assessments (extension = 0.31; flexion = 0.44; ROM = 0.42; P ≤ 0.001 for all). Patient-reported and physician-assessed AKS Pain, Knee and Functional scores were: 35.8 ± 15.6 vs 43.9 ± 11.1 (P < 0.001), 79.8 ± 20 vs 88.9 ± 13.3 (P < 0.001) and 57.7 ± 23.1 vs 65.7 ± 26.4 (P < 0.001), respectively. Patient- and physician-assessed AKS Pain, Knee and Functional scores had moderate–high correlation (r = 0.49, 0.49 and 0.70; P ≤ 0.001 for all). Conclusion. Long-term surveillance of TKA patients may be possible using a self-report AKS, but the average 8- to 10-point difference between patient- and physician-reported AKS scores (patients reporting poorer scores) represents a substantial impact on this outcome instrument. Since patient-reported responses have clear value in global assessment, further evaluation with other validated outcome instruments is warranted.Keywords
This publication has 35 references indexed in Scilit:
- The Patient-Reported Outcomes Measurement Information System (PROMIS)Medical Care, 2007
- Outcome-Messung in der Knieendoprothetik: Ist die klinische Bestimmung der Gelenkbeweglichkeit eine zuverlässig messbare Ergebnisgröße?Zeitschrift Fur Orthopadie Und Ihre Grenzgebiete, 2005
- Patient- versus physician-reported outcomes in rheumatoid arthritis patients treated with recombinant interleukin-1 receptor antagonist (anakinra) therapyRheumatology, 2004
- Scoring Systems in Total Knee ArthroplastyClinical Orthopaedics and Related Research, 2002
- The reliability of the American Knee Society ScoreActa Orthopaedica, 2000
- Methods for Assessing Condition-Specific and Generic Functional Status Outcomes After Total Knee ReplacementMedical Care, 1992
- Variability and reliability of joint measurementsThe American Journal of Sports Medicine, 1990
- Rationale, of The Knee Society Clinical Rating SystemClinical Orthopaedics and Related Research, 1989
- The Knee Society Total Knee Arthroplasty Roentgenographic Evaluation and Scoring SystemClinical Orthopaedics and Related Research, 1989
- The MOS Short-form General Health SurveyMedical Care, 1988