The Hip disability and Osteoarthritis Outcome Score, Junior (HOOS JR.) is an outcome reporting tool that was validated in 2015. It’s been receiving interest from the orthopedic community as an efficient and reliable alternative to the longer Hip disability and Osteoarthritis Outcome Score (HOOS) reporting tool.

The widely used HOOS questionnaire measures joint-specific pain and physical function, and contains 42 questions. By contrast, the HOOS JR. has six questions.

Questions in HOOS JR. are taken directly from the parent questionnaire and focus on the three categories: joint pain, stiffness and function in daily living instead of the five categories in the HOOS survey: pain, function in daily living, function in sport and recreation, other symptoms, and knee-related quality of life.

In the HOOS JR questionnaire, patients rate each activity by indicating the amount of pain or disability they experience while carrying them out. Raw scores are added up and then converted to an interval score (0-100) using an interval table. The final interval score represents a patients total joint disability where 0 corresponds to total joint disability and 100 is perfect joint health.

The brevity of the HOOS JR. survey allows for faster completion and greater patient engagement.

What’s the difference between HOS, HOOS, and HOOS Jr?

Find out with our Hip PRO Tools Guide. Download Now.


The main advantage of the HOOS JR. is its significantly shortened length. With a completion time of under 3 minutes, it’s an attractive alternative to the longer HOOS tool. Scoring of HOOS JR. is also faster and easier to apply than HOOS.

Additionally, HOOS JR. has also been validated by the Hunger Sensitivity Score (HSS) validation cohort and the FORCE-TJR registry.



As a newly validated outcome tool there is very little literature at present about the HOOS JR. Over time further studies and research should help provide a more complete picture about the robustness and reliability of the HOOS JR. as an outcome reporting tool.



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CODE Technology is a PRO vendor singularly focused on collecting, reporting, and benchmarking PRO data as a service. Our real life humans – not robots – will administer surveys and handle all data collection, 100% outside of the office, you won’t even know we’re there. Better yet, with CODE as your outcomes vendor, additional employees to help with all the data won’t be necessary. Just ask our client, Joe Holmbo, Clinical Director for ORA Orthopedics. “For us to be able to collect PROs without adding any additional staff, it’s well worth the investment that we’ve made with CODE.”

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The joint commission: Candidate Performance Measure Profile –
Patient Reported Outcomes Summit for Total Joint Arthroplasty Report. August 2015 –
Joint Communication from the American Association of Orthopaedic Surgeons, the American joint replacement registry, The Hip Society, The Knee Society, and the American Association of Hip and Knee Surgeons. Issued 8 September 2015. –
Roos, E. M., & Lohmander, L. S. (2003). The Knee injury and Osteoarthritis Outcome Score (KOOS): from joint injury to osteoarthritis. Health and Quality of Life Outcomes, 1, 64.
Peer MA, Lane J. J Orthop Sports Phys Ther. 2013 Jan;43(1):20-8. doi: 10.2519/jospt.2013.4057. Epub 2012 Dec 7. Review. –
Davis, A. M., Perruccio, A. V., Canizares, M., Hawker, G. A., Roos, E. M., Maillefert, J. F., & Lohmander, L. S. (2009). Comparative, validity and responsiveness of the HOOS-PS and KOOS-PS to the WOMAC physical function subscale in total joint replacement for osteoarthritis. Osteoarthritis and Cartilage, 17(7), 843-847. –