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Advisors

Jennifer Baima

Publication Date

2020-02-14

Department of Advisors

Orthopedics and Physical Rehabilitation

Document Type

Poster

Abstract

Prehabilitation to improve patient positioning: pelvic exercises assist in reducing sacral slope variability during radiation therapy

Purpose/Objective(s):

Reproducible patient positioning is essential for precision in radiation therapy (RT) delivery. However, a retrospective review of pre-treatment imaging demonstrated variability in daily patient set-up. We tested the hypothesis that a structured daily pre-treatment stretching regimen is both feasible and effective for minimizing variability in positioning, as measured by sacral slope angles (SSA).

Materials/Methods:

After obtaining IRB approval, we had 8 female patients undergoing pelvic radiotherapy perform a structured daily hip exercise regimen (extension and external rotation) immediately prior to both simulation and daily treatment, throughout the RT course. The control group of 20 patients (17 female and 3 male) had usual care. SSA measurements on daily pre-treatment imaging were compared to SSA measurements from the simulation CT for 5 weeks. The extent of SSA variability between two groups and over time was analyzed using a linear mixed model. The same two readers independently measured SSA of all subjects, comparing SSA on the day of simulation to SSA measured on each day of RT.

Results:

The average variation in SSA among the intervention subjects was 0.913° (±0.582°), with a range among subjects of 0.57°-1.3°. The average variation for the control subjects was 2.27° (±1.43°), with range among subjects of 1.22° - 5.09°. The difference between the two groups was statistically significant (p=0.002). There was a statistically significant SSA variation between groups at each week of treatment (Week (wk) 1: p = 0.007, wk 2: p = 0.008, wk 3: p = 0.01, wk 4: p = 0.005, wk 5: p = 0.008). There was no significant variation among the intervention subjects between week 1 and later weeks (wk 2: p = 0.88, wk 3: p = 0.74, wk 4: p = 0.97, wk 5: p = 0.40), whereas subjects in the control group demonstrated significant SSA variation between week 1 and the fourth week of therapy (wk 2: p = 0.87, wk 3: p = 0.92, wk 4: p = 0.02, wk 5: p = 0.22). There were no reported adverse effects of the stretching regimen.

Conclusion:

We demonstrated a significant decrease in the variability of SSA by implementing a simple pre-treatment stretching program, whereas control subjects exhibited an increasing variability of SSA over the course of treatment. We conclude that there is a potential benefit for prehabilitation during pelvic RT. A larger clinical trial is required to determine whether a pre-treatment stretching program would result in clinical benefit.

Keywords

Exercise therapy, Inter-fraction reproducibility, Patient Setup, Pelvic cancer radiotherapy, Prehabilitation

DOI

10.13028/gpwx-wd93

Subject Categories

Medical Education | Orthopedics | Radiation Medicine | Rehabilitation and Therapy

Rights and Permissions

Copyright is held by the author(s), with all rights reserved.

Prehabilitation to Improve Positioning Reproducibility in Patients Undergoing Pelvic Radiation Therapy

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