Hip Outcome Score
Introduction[edit | edit source]
Hip Outcome Score (HOS) is a patient-reported outcome measure designed to assess the outcome of treatment intervention (arthroscopic hip surgery) for individuals with acetabular labral tears.  The Hip Outcome Score (HOS) was developed as an evaluative self-report instrument to assess the outcomes of arthroscopic hip surgery.
Objective[edit | edit source]
The purpose of this instrument was used to assess self-reported functional status of patient with labral tear. Therefore, according to the terms defined by the International Classification of Functioning, Disability and Health model items that related to activity and participation were included whereas items relating to body structure and function (i.e., symptoms) were not considered. full spectrum of functional activities and sports-related activities was included.
Methods of Use[edit | edit source]
Patients are asked about their functional ability and how much difficulty do they have with their hip over the past weeks. The ADL subscale contained 19 items pertaining to basic daily activities, and the sports subscale contained 9 items pertaining to higher-level activities. HOS consist of 5 potential responses, ranging from “unable to do” to “no difficulty.” In the scoring responses were from 0 =“unable to do” to 5= “no difficulty”.
In addition, a response of “nonapplicable” was also added. This allows subjects to designate that something other than their hip problem limits their activity. This means that both missing responses and nonapplicable responses could not be scored.
Score Interpretation[edit | edit source]
A score is generated separately for the ADL and sports subscales. The item related to sitting and the item related to putting on socks and shoes are not scored. The response to each of the other 17 items on the ADL subscale is scored from 4 to 0, with 4 being “no difficulty” and 0 being “unable to do.” A response of not applicable (N/A) is also an option when the item in question is limited by something other than the individual’s hip pathology. Responses of “N/A” are not figured into the scoring.
The scores for each of the items are added together to get the item score total. The total number of items with a response is multiplied by 4 to get the highest potential score. If the subject answers all 17 items, the highest potential score is 68. If 1 item is not answered, the highest score is 64; if 2 are not answered, the total highest score is 60; and so on. The item score total is divided by the highest potential score. This value is then multiplied by 100 to get a percentage. The 9-item sports subscale is scored in a similar manner. A higher score represents a higher level of physical function for both the ADL and sports subscales.
Psychometric properties[edit | edit source]
The HOS-ADL have high ceiling effects of 36.02%, and the HOS-sports have no ceiling effects. HOS have no any floor effects. 
Reliability and Responsiveness[edit | edit source]
Reliabilities for HOS-ADL and HOS-sports were good in some studies. However, the HOS is reliable and responsive when describing outcomes of hip arthroscopy for labral pathology, femoroacetabular impingement, chondral lesions, or capsular laxity. Specifically, the test-retest reliability of the HOS ADL and sports subscales was found to be excellent (ICC ⟩ 0.90).
The ICC values were 0.98 and 0.92 for the ADL and sports subscales, respectively. The MDC values based on 95% confidence intervals were ±3 points for both the ADL and sports subscales.
Validity[edit | edit source]
Different study support the use of the HOS ADL and sports subscales as a self report outcome instrument for hip arthroscopy.
The HOS have relatively high correlations with concurrent measures of physical function and relatively low correlations with concurrent measures of mental health.
Resources[edit | edit source]
References[edit | edit source]
- Martin RL, Kelly BT, Philippon MJ. Evidence of validity for the hip outcome score. Arthroscopy: the journal of arthroscopic & related surgery. 2006 Dec 1;22(12):1304-11.
- Martin RL, Philippon MJ. Evidence of reliability and responsiveness for the hip outcome score. Arthroscopy: the journal of arthroscopic & related surgery. 2008 Jun 1;24(6):676-82.
- Hung M, Hon SD, Cheng C, Franklin JD, Aoki SK, Anderson MB, Kapron AL, Peters CL, Pelt CE. Psychometric evaluation of the lower extremity computerized adaptive test, the modified Harris hip score, and the hip outcome score. Orthopaedic Journal of Sports Medicine. 2014 Dec 19;2(12):2325967114562191.
- Martin RL, Philippon MJ. Evidence of validity for the hip outcome score in hip arthroscopy. Arthroscopy: The Journal of Arthroscopic & Related Surgery. 2007 Aug 1;23(8):822-6.