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Can a Made-for-Consumer Activity Monitor Assess Physical Activity in Adolescents and Young Adults After Lower Extremity Limb Salvage for Osseous Tumors?

Gundle, Kenneth R. MD; Punt, Stephanie E. BS; Mattioli-Lewis, Tressa MPH; Conrad, Ernest U. III MD

Journal of Pediatric Orthopaedics: April/May 2017 - Volume 37 - Issue 3 - p e192–e196
doi: 10.1097/BPO.0000000000000857
Lower Extremity

Background: The purpose of this study was to test the validity of a consumer-oriented activity monitor in adolescents and young adults undergoing limb salvage for primary bone malignancies.

Methods: A cross-sectional population of participants with an average age of 16 (range 12 to 22) years produced 472 days of activity monitoring during 25 evaluations periods alongside patient-reported outcome measures.

Results: Average daily steps ranged from 557 to 12,756 (mean=4711) and was moderately associated with the short-form (SF) 36 physical component subscale (r=0.46, P=0.04) as well as the SF6D health state utility measure (r=0.48, P=0.04), but not the SF36 mental component subscale (P=0.66) or Toronto extremity salvage score (P=0.07). Time from surgery was strongly correlated with average daily steps (r=0.7, P<0.001).

Conclusions: A made-for-consumer activity monitor provided real-world data regarding the outcome of adolescent and young adult limb salvage, and evidence of validity in this population. Such lower cost, user-friendly devices may facilitate assessment of free-living activity and allow novel comparisons of treatment strategies.

Level of Evidence: Level II—diagnostic.

*Department of Orthopaedics & Rehabilitation, Oregon Health & Science University, Portland, OR

Department of Orthopaedics & Sports Medicine, University of Washington

Department of Orthopedics & Sports Medicine, Seattle Children’s Hospital, Seattle, WA

Supported by University of Washington Department of Orthopaedics & Sports Medicine Resident Research Fund.

The authors declare no conflicts of interest.

Reprints: Kenneth R. Gundle, MD, Department of Orthopaedics & Rehabilitation, Oregon Health & Science University, 3183 SW Sam Jackson Park Road, OP31, Portland, OR 97239. E-mail:

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