Association between body mass index and 90-day postoperative complications after insertional Achilles debridement and suture-anchor reattachment: a retrospective cohort study
This retrospective cohort study of 217 insertional Achilles tendon surgeries found that higher body mass index is significantly associated with an increased risk of 90-day postoperative complications, particularly for patients with a BMI ≥ 35 kg/m², though this relationship is nonlinear and BMI did not affect the time to return to usual activity.
Original paper licensed under CC BY 4.0 (https://creativecommons.org/licenses/by/4.0/). This is an AI-generated explanation of the paper below. It is not written or endorsed by the authors. For technical accuracy, refer to the original paper. Read full disclaimer
The back of the heel is a place of constant, heavy labor. Every step a person takes sends a massive force through the Achilles tendon, the thick band of tissue that connects the calf muscles to the heel bone. For some, this relentless stress leads to a painful condition called insertional Achilles tendinopathy. Unlike a sudden tear, this is a slow, grinding degeneration where the tendon wears down right where it attaches to the bone. Often, a bony bump on the heel, known as a Haglund deformity, rubs against the tendon and the skin, creating a cycle of inflammation, pain, and difficulty walking. When rest, special shoes, and physical therapy fail to stop the pain, surgeons may step in. The operation involves cleaning away the damaged tissue, shaving down the bony bump, and reattaching the tendon securely to the bone using small anchors. While this surgery often restores function, the skin on the back of the heel is thin and delicate, making the area prone to healing problems after the cut is made.
For years, doctors have wondered if a patient's body weight plays a major role in how well this surgery goes. Obesity is known to strain the body and can sometimes slow down wound healing, but the evidence for this specific heel surgery has been mixed and unclear. Some studies suggested weight mattered, while others found no clear link. To settle this question, a team of researchers at the Mayo Clinic looked back at nearly two hundred operations performed over more than a decade. They focused on a specific group of patients who underwent the same standardized procedure: cleaning the damaged tendon, removing the bony spur, and reattaching the tendon with anchors. The team wanted to see if the body mass index, a common measure of body size based on height and weight, could predict whether a patient would face complications within the first three months after surgery.
The researchers examined the medical records of 194 patients who had 217 of these procedures. They paid close attention to every patient's weight and height to calculate their body mass index, and they tracked every complication that occurred within ninety days of the operation. These complications included anything from minor wound issues like drainage or redness to more serious problems like deep infections, blood clots, or the tendon failing to heal. To ensure accuracy, two independent reviewers checked every chart, and if there was any doubt about whether an event counted as a complication, two surgeons who did not know the patients' weights made the final decision. This careful process helped remove bias and ensured that the results reflected the true outcomes of the surgery.
The study found a clear connection between higher body mass index and a greater risk of complications. As the body mass index increased, the likelihood of facing a problem within ninety days also rose. The relationship was not a simple straight line; the risk climbed most noticeably as patients moved from a normal weight into the overweight and obese ranges. When the researchers looked specifically at patients with a body mass index of 35 or higher, they found a stark difference. In this group, about one in four procedures resulted in a complication. In contrast, among patients with a body mass index below 35, only about one in twelve procedures had a complication. This means that for the heavier group, the risk of a postoperative problem was nearly four times higher than for the lighter group. The most common issues were wound-related, such as the incision taking too long to heal or developing an infection, which makes sense given the thin skin and heavy mechanical stress in that area.
Interestingly, while a higher body mass index made complications more likely, it did not seem to change how long it took for patients to return to their normal activities once they had healed. The study found no link between body weight and the speed of recovery for those who did not have complications. This suggests that while extra weight might make the immediate healing phase more difficult, it does not necessarily slow down the overall journey back to work or sports for everyone. The researchers noted that the data showed a complex pattern where the risk increased sharply in the middle ranges of body mass index and then appeared to level off at the very highest weights, though there were fewer patients at those extreme levels to confirm this trend with absolute certainty.
The authors emphasize that these findings should be used as a guide for conversation, not as a rule to deny surgery. A body mass index of 35 or higher serves as a useful marker to identify patients who might need extra attention before and after the operation. It suggests that for these individuals, the surgeon should have a detailed discussion about the higher risk of wound problems, perhaps focusing on optimizing health factors like blood sugar control or smoking cessation before the procedure. The study does not prove that weight is the sole cause of these issues, as other factors like diabetes and smoking also play a role, but it confirms that body size is a significant piece of the puzzle. By understanding this risk, doctors and patients can make more informed decisions, preparing for a recovery that acknowledges the extra challenges a heavier body might face while still aiming for the successful restoration of a pain-free heel.
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