Shoulder Surgery Readmissions: Risk Factors & Improving Outcomes

Shoulder replacement surgery is increasingly common in the United States, particularly as the population ages. While generally successful, a new study from Penn State University highlights factors that can increase the risk of hospital readmission within 30 days of the procedure, specifically for patients undergoing inpatient shoulder replacement surgeries in Pennsylvania. Understanding these risk indicators is crucial for improving patient outcomes and optimizing healthcare resource allocation.

Identifying Readmission Risks

Published in JBJS Open Access, the research, led by Christopher Hollenbeak, professor and head of the Department of Health Policy and Administration at Penn State, analyzed data from over 14,000 inpatient shoulder replacement surgeries performed between 2010 and 2018. The study identified several key factors associated with a higher likelihood of readmission. These included the urgency of the initial hospital admission, the number of pre-existing health conditions a patient had, the type of post-discharge care received, and the patient’s insurance type.

Researchers utilized data from the Pennsylvania Health Care Cost Containment Council, allowing them to track patients who underwent surgery at one hospital but were readmitted to a different facility within the state. This comprehensive approach provides a broader picture of readmission patterns than studies limited to single institutions.

Insurance and Post-Discharge Care

The study revealed a significant disparity in readmission rates based on insurance coverage. Patients insured by Medicare were 96% more likely to be readmitted within 30 days compared to those with private insurance. This difference doesn’t necessarily indicate a difference in the quality of care received, but rather highlights potential disparities in access to resources and follow-up care.

the type of post-discharge care played a role. Patients discharged to a skilled nursing facility had a 61% higher risk of readmission, while those receiving home health care were 28% more likely to return to the hospital within the month. These findings suggest that the level of support and monitoring provided after surgery can significantly impact recovery and prevent complications.

Urgency and Surgical Approach

The urgency of the initial surgery similarly emerged as a significant risk factor. Patients admitted for urgent shoulder replacement – often due to a fracture or acute injury – were 65% more likely to be readmitted compared to those undergoing scheduled procedures. This is likely due to the more complex nature of urgent cases and the potential for underlying health issues that contribute to slower recovery.

The type of shoulder replacement performed also influenced readmission rates. Patients who received a reverse shoulder replacement, a procedure often used for individuals with severe rotator cuff damage, were 36% more likely to be readmitted. Reverse shoulder replacements are frequently performed in cases involving a fractured humerus, which inherently carries a higher risk profile.

Comorbidities and Complex Health Profiles

The presence of other medical conditions, known as comorbidities, significantly increased the risk of readmission. Patients with one or two pre-existing conditions, such as heart disease or diabetes, were 52% more likely to be readmitted. This risk escalated dramatically for those with three or more conditions, with a 148% increase in readmission rates. This underscores the importance of comprehensive pre-operative assessment and management of existing health issues.

Understanding the Nuances of Readmission Risk

It’s significant to note that the identified risk factors are not necessarily direct causes of readmission. As April Armstrong, co-author of the study and Chair in the Department of Orthopaedics and Therapy Services at Penn State College of Medicine, explains, these factors often correlate with more complex health profiles and potentially slower recovery times. For example, patients with multiple comorbidities may experience more complications post-surgery, increasing their demand for additional hospitalization.

Implications for Patient Care and Healthcare Systems

The findings of this study have important implications for both patient care and healthcare systems. A multidisciplinary approach to discharge planning is essential, involving collaboration between surgeons, nurses, physical therapists, and other healthcare professionals. Clear communication with patients and their families regarding medication management, postoperative follow-up care, and potential complications is also crucial.

The researchers suggest that healthcare systems could benefit from providing additional training for home health workers and staff at skilled nursing facilities. Enhanced training could focus on recognizing early signs of infection or bleeding, allowing for prompt intervention and potentially preventing readmission. Hospitals also have a financial incentive to reduce readmission rates for Medicare patients, as high rates can lead to reduced payments.

Investing in robust discharge planning and staff training could not only improve patient outcomes but also lead to significant cost savings for healthcare systems. “Each readmission is very expensive, so training would be financially worthwhile. More importantly, it’s a better outcome for patients,” says Hollenbeak.

Further research is needed to explore the underlying mechanisms driving these readmission disparities and to develop targeted interventions to address them.

Looking Ahead: Ongoing surveillance of readmission rates and continuous quality improvement initiatives are essential for optimizing shoulder replacement care and ensuring the best possible outcomes for patients. The Pennsylvania Health Care Cost Containment Council continues to collect and analyze data on surgical procedures, providing valuable insights for healthcare providers and policymakers.

Brian J. Johnson et al, 30-Day Readmission Following Inpatient Total Shoulder Arthroplasty in Pennsylvania, JBJS Open Access (2026). DOI: 10.2106/jbjs.oa.25.00206