Clinical Orthopaedics and Related Research®

, Volume 473, Issue 1, pp 372–379 | Cite as

Can Therapy Dogs Improve Pain and Satisfaction After Total Joint Arthroplasty? A Randomized Controlled Trial

  • Carl M. Harper
  • Yan Dong
  • Thomas S. Thornhill
  • John Wright
  • John Ready
  • Gregory W. Brick
  • George Dyer
Clinical Research



The use of animals to augment traditional medical therapies was reported as early as the 9th century but to our knowledge has not been studied in an orthopaedic patient population. The purpose of this study was to evaluate the role of animal-assisted therapy using therapy dogs in the postoperative recovery of patients after THA and TKA.


We asked: (1) Do therapy dogs have an effect on patients’ perception of pain after total joint arthroplasty as measured by the VAS? (3) Do therapy dogs have an effect on patients’ satisfaction with their hospital stay after total joint arthroplasty as measured by the Hospital Consumer Assessment of Healthcare Providers and Systems (HCAHPS)?


A randomized controlled trial of 72 patients undergoing primary unilateral THA or TKA was conducted. Patients were randomized to a 15-minute visitation with a therapy dog before physical therapy or standard postoperative physical therapy regimens. Both groups had similar demographic characteristics. Reduction in pain was assessed using the VAS after each physical therapy session, beginning on postoperative Day 1 and continuing for three consecutive sessions. To ascertain patient satisfaction, the proportion of patients selecting top-category ratings in each subsection of the HCAHPS was compared.


Patients in the treatment group had lower VAS scores after each physical therapy session with a final VAS score difference of 2.4 units (animal-assisted therapy VAS, 1.7; SD, 0.97 [95% CI, 1.4–2.0] versus control VAS, 4.1; SD, 0.97 [95% CI, 3.8–4.4], p < 0.001) after the third physical therapy session. Patients in the treatment group had a higher proportion of top-box HCAHPS scores in the following fields: nursing communication (33 of 36, 92% [95% CI, 78%–98%] versus 69%, 25 of 36 [95% CI, 52%–84%], p = 0.035; risk ratio, 1.3 [95% CI of risk ratio, 1.0–1.7]; risk difference, 23% [95% CI of risk difference, 5%–40%]), pain management (34 of 36, 94% [95% CI, 81%–99%], versus 26 of 36, 72% [95% CI, 55%–86%], p = 0.024; risk ratio, 1.3 [95% CI of risk ratio, 1.1–1.6]; risk difference, 18% [95% CI of risk difference, 5%–39%]). The overall hospital rating also was greater in the treatment group (0–10 scale) (9.6; SD, 0.7 [95% CI, 9.3–9.8] versus 8.6, SD, 0.9 [95% CI, 8.3–8.9], p < 0.001).


The use of therapy dogs has a positive effect on patients’ pain level and satisfaction with hospital stay after total joint replacement. Surgeons are encouraged to inquire about the status of volunteer-based animal-assisted therapy programs in their hospital as this may provide a means to improve the immediate postoperative recovery for a select group of patients having total joint arthroplasty.

Level of Evidence

Level II, randomized controlled study. See Instructions for Authors for a complete description of levels of evidence.


Total Joint Arthroplasty Physical Therapy Session Postoperative Physical Therapy Sickle Cell Crisis Hospital Consumer Assessment 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.



We acknowledge and thank the orthopaedic physical therapy and orthopaedic nursing teams for their assistance in coordinating visits and administering surveys. We also thank Beth D. Harper MD (Department of Medicine, Boston Children’s Hospital, Harvard Medical School), for training the therapy dog and guidance and support during the design and implementation of this study.


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Copyright information

© The Association of Bone and Joint Surgeons® 2014

Authors and Affiliations

  • Carl M. Harper
    • 1
  • Yan Dong
    • 2
  • Thomas S. Thornhill
    • 2
  • John Wright
    • 2
  • John Ready
    • 2
  • Gregory W. Brick
    • 2
  • George Dyer
    • 2
  1. 1.Department of Orthopaedic SurgeryHarvard Medical SchoolBostonUSA
  2. 2.Department of Orthopaedic SurgeryBostonUSA

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