The Development and Validation of a More Discriminating Functional Hip Score for Research

Sujith Konan, MRCS
Trauma and Orthopaedics, University College London Hospital, London, UK

Jenni Tahmessabi, BSc
Trauma and Orthopaedics, University College London Hospital, London, UK

Fares S. Haddad, MCh (Orth), FRCS(Orth)
Trauma and Orthopaedics, University College London Hospital, London, UK


Abstract

Background 
Total hip arthroplasty (THA) is a commonly performed procedure with increasing frequency in the young adult. While most available outcome measures can document postoperative improvement in pain and function, they do not measure the ability to perform high-demand activities.

Questions/Purposes 
We present and validate a user-friendly discriminating hip scoring system (the functional hip score) for use in younger, “high-demand” patients undergoing hip arthroplasty surgery.

Methods 
We studied 38 subjects without any hip symptoms and 72 patients undergoing THA for osteoarthritis of the hip. Preprocedure and postprocedure scores were collected in the latter cohort of patients. SF-36 and WOMAC scores were used to validate our functional scoring system. The functional hip score was tested for internal consistency, reliability, and criterion validity.

Results 
The functional hip score had high test–retest reliability, internal consistency, and criterion validity. This can be used to measure functional outcome in the younger high-demand adult patient undergoing THA.

Conclusion 
Our discriminating functional hip score can reliably measure improvement in hip function in the younger high-demand adult. Current scoring systems have ceiling effects and are unable to differentiate a high performing hip replacement from the routine hip replacement. The use of functional tasks that are measured objectively allows better documentation of improvement in hip function.

This article appears in HSS Journal: Volume 8, Number 3.
View the full article at springerlink.com.

About the HSS Journal

HSS Journal, an academic peer-reviewed journal published three times a year, February, July and October. The Journal accepts and publishes peer reviewed articles from around the world that contribute to the advancement of the knowledge of musculoskeletal diseases and disorders.


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