Cutoff Value for the Patient Acceptable Symptom State of the Thai IKDC Subjective Knee Form in Patients After Primary ACL Reconstruction

Overview

Journal Orthop J Sports Med

Specialty Orthopedics

Date 2022 Aug 25

PMID 36003967

Authors

Tananthorn Piamthipmanas

Pisit Lertwanich

Phob Ganokroj

Bavornrat Vanadurongwan

Ekavit Keyurapan

Chanin Lamsam

Affiliations

Soon will be listed here.

Abstract

Background: The Patient Acceptable Symptom State (PASS) cutoff is the value on a patient-reported outcome measure beyond which patients consider themselves to be "feeling well." There are limited data regarding the PASS threshold for non-English versions of the International Knee Documentation Committee-Subjective Knee Form (IKDC-SKF).

Purpose: To establish the PASS cutoff for the Thai version of the IKDC-SKF for patients undergoing primary anterior cruciate ligament reconstruction (ACLR) and to identify factors to achieve PASS after surgery.

Study Design: Cohort study (diagnosis); Level of evidence, 3.

Methods: Included in this study were patients aged 18 to 50 years who had undergone primary unilateral ACLR between January 2016 and February 2020. After enrollment, patients completed the Thai IKDC-SKF and answered the anchor question for determining the PASS.

Results: Questionnaires were sent to 321 patients, of whom 173 (53.9%) responded. The vast majority (156 patients; 90.2%) considered themselves to have achieved the PASS. This group of patients had significantly higher IKDC scores than did those who did not have an acceptable symptom state (79.6 ± 14.2 vs 60.7 ± 16.5; < .001). The receiver operating characteristic curve of the IKDC score for predicting the PASS had an area under the curve of 0.82 (95% CI, 0.72-0.91). The optimum PASS cutoff of the Thai IKDC-SKF was a score of 74.2 (sensitivity, 0.72; specificity, 0.82). Factors that provided favorable odds for achieving the PASS were the use of a hamstring tendon autograft (odds ratio, 4.1; 95% CI, 1.5-20.6) and the absence of a patellofemoral chondral lesion (odds ratio, 3.8; 95% CI, 1.03-14.1).

Conclusion: For patients undergoing ACLR, the cutoff for the PASS of the Thai version of the IKDC-SKF was a score of 74.2. Two surgery-related factors provided favorable odds for achieving the PASS: the use of a hamstring tendon autograft and the absence of a patellofemoral chondral lesion.

Citing Articles

Relationship Between Quadriceps Strength at 6 Months Postoperatively and Improvement in Patient-Reported Knee Function After Anterior Cruciate Ligament Reconstruction.

Ishida T, Suzuki M, Matsumoto H, Samukawa M, Kaneko S, Inoue C Orthop J Sports Med. 2025; 13(1):23259671241305623.

PMID: 39866956 PMC: 11760129. DOI: 10.1177/23259671241305623.

Responsiveness and Minimal Clinically Important Difference of the Thai Version of the International Knee Documentation Committee Subjective Knee Form in Patients With Anterior Cruciate Ligament Injury.

Kerdtho T, Lertwanich P Orthop J Sports Med. 2023; 11(11):23259671231210321.

PMID: 38021306 PMC: 10664449. DOI: 10.1177/23259671231210321.

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