Associated Joint Pain with Controlled Ankle Movement (CAM) Walker Boot Wear

Abstract

Category: Ankle Introduction/Purpose: A controlled ankle movement (CAM) walker boot is often prescribed for patients with a lower extremity injury or disorder. CAM boot wear, however, may cause gait alterations and leg-length discrepancy, which are commonly associated with joint pain. This study evaluates the location, frequency and duration of secondary site pain relating to immobilization in a CAM walker boot. Methods: Patients wearing a CAM walker boot for treatment of a foot or ankle injury were prospectively enrolled and evaluated for new or worsened secondary site pain. Surveys at four time points were completed to evaluate the presence of secondary site pain, its severity, and its impact on overall function. Results: The final study population included 46 patients (mean age 49 years). At transition out of the boot (mean, 4.2 weeks), 31 patients (67%) reported secondary site pain either new or worse than baseline with an average of 1.6 secondary pain sites. The secondary sites most susceptible to pain were the lower back, contralateral hip, and ipsilateral knee. A majority (84%) of these pains began within the first two weeks of boot wear. Secondary site pain was less common after transition out of the boot: 18 patients (39%) at 1 month, 15 patients (33%) at 3 months. The mean VAS for secondary site pains at transition out of boot was 51.2. Statistical significance was found correlating secondary site pain and a history of chronic pain (P=.04). Conclusion: Secondary site pain after CAM walker boot wear was common. The frequency and severity of pain lessened with time after transition out of the boot. Yet, one-third of patients still had new or worsened secondary site pain three months after cessation of boot wear.