Thromboembolic Events During Weightbearing vs Nonweightbearing Accelerated Rehabilitation Protocols for Complete Achilles Tendon Ruptures

BACKGROUND: Achilles tendon rupture can be treated nonoperatively with functional rehabilitation. However, prolonged immobilization has associated risk of venous thromboembolism (VTE). Early weightbearing may reduce VTE risk, and this was introduced to our rehabilitation protocol. We investigated the prevalence of symptomatic VTE events before and after the introduction of the early weightbearing protocol. METHODS: Adults with ultrasonography-confirmed complete tendo-Achilles ruptures between January 2017 and June 2020 were included. Preprotocol, patients were instructed to not weightbear for 4 weeks. In 2018, immediate weightbearing was introduced to the treatment protocol. All patients in both cohorts were given low-molecular-weight heparin for 4 weeks. Patients with symptomatic VTE events were investigated with duplex ultrasonographic scan or chest computed tomography. Two independent anonymized examiners collected data from electronic records. Rates of symptomatic VTEs were compared. RESULTS: A total of 296 patients were included. Sixty-nine patients were managed with the nonweightbearing protocol, and 227 patients were managed with the early-weightbearing protocol. Two patients in each group developed deep vein thrombosis and 1 developed pulmonary embolism in the early-weightbearing group. Rates of VTEs were lower in the early-weightbearing group (1.3% vs 2.9%) but did not reach statistical significance (P = .33). CONCLUSION: In this cohort we found that symptomatic VTE after nonoperatively treated Achilles tendon rupture was uncommon. We did not demonstrate a reduction in symptomatic VTE between our early weightbearing and nonweightbearing rehabilitation protocols. We believe a larger study may help clarify whether early weightbearing is beneficial in VTE reduction. LEVEL OF EVIDENCE: Level III, retrospective cohort study.