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Scientific Articles   |    
A Novel Patellofemoral Scoring System for Patellofemoral Joint Status
Choong-Hee Lee, MD1; Chul-Won Ha, MD1; Seonwoo Kim, PhD2; Minji Kim, MS2; Young-Joon Song, MD1
1 Department of Orthopaedic Surgery, Samsung Medical Center, SungKyunKwan University School of Medicine, Gangnam-gu, Irwon-dong 50, Seoul 135-710, Republic of Korea. E-mail address for C.-W. Ha: hacw@skku.edu
2 Biostatistics Team, Samsung Biomedical Research Institute, Gangnam-gu, Irwon-dong 50, Seoul 135-710, Republic of Korea
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Investigation performed at the Department of Orthopaedic Surgery, Samsung Medical Center, SungKyunKwan University School of Medicine, and the Biostatistics Team, Samsung Biomedical Research Institute, Seoul, Republic of Korea



Disclosure: None of the authors received payments or services, either directly or indirectly (i.e., via his or her institution), from a third party in support of any aspect of this work. None of the authors, or their institution(s), have had any financial relationship, in the thirty-six months prior to submission of this work, with any entity in the biomedical arena that could be perceived to influence or have the potential to influence what is written in this work. Also, no author has had any other relationships, or has engaged in any other activities, that could be perceived to influence or have the potential to influence what is written in this work. The complete Disclosures of Potential Conflicts of Interest submitted by authors are always provided with the online version of the article.

Copyright © 2013 by The Journal of Bone and Joint Surgery, Inc.
J Bone Joint Surg Am, 2013 Apr 03;95(7):620-626. doi: 10.2106/JBJS.K.01606
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Abstract

Background: 

We were not aware of a well-validated patellofemoral joint-specific scoring system. We performed this study to develop and validate a scoring system (Samsung Medical Center [SMC] patellofemoral scoring system) suitable for the evaluation of patellofemoral joint status.

Methods: 

We recruited 179 individuals consisting of a study group of 123 patients with anterior knee pain but without pain in another part of the knee, twenty-eight patients with knee pain other than anterior knee pain (group A), and twenty-eight healthy volunteers without knee pain (group B). Items in the development of the scoring system that showed a significant difference between the study group and group A and between the study group and the group B were selected. Test-retest reliability was measured by intraclass correlation coefficient, internal consistency was measured by the Cronbach alpha, content validity was assessed by ceiling and floor effects, and construct validity was determined by the association of the Feller scores and the SMC patellofemoral scores.

Results: 

After the item verification process, seventeen items (eight items for patellofemoral pain and nine items for patellofemoral function) were selected. Test-retest reliability for overall SMC patellofemoral scores showed excellent reliability (intraclass correlation coefficient, 0.85), and internal consistency was excellent (Cronbach alpha, 0.97). Floor and ceiling effects were acceptable (<30%) for all the items of the SMC patellofemoral scoring system, except one: sitting down on a chair, in the patellofemoral function score. The SMC patellofemoral scores showed moderate correlation with the Feller scores (ρ = –0.45).

Conclusions and Clinical Relevance: 

The SMC patellofemoral score is a novel scoring system that distinguishes patients with anterior knee pain or patellofemoral dysfunction from patients with knee pain or dysfunction arising from other knee problems, and from those without knee pain. The reliability and validity of the SMC patellofemoral scoring system were verified in the present study.

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    References

    Accreditation Statement
    These activities have been planned and implemented in accordance with the Essential Areas and policies of the Accreditation Council for Continuing Medical Education (ACCME) through the joint sponsorship of the American Academy of Orthopaedic Surgeons and The Journal of Bone and Joint Surgery, Inc. The American Academy of Orthopaedic Surgeons is accredited by the ACCME to provide continuing medical education for physicians.
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