Acute popliteal artery thrombosis after simultaneous bilateral total knee arthroplasty: a case report with long-term follow-up
This case report describes a 66-year-old woman who successfully achieved limb salvage and maintained long-term vascular patency following acute popliteal artery thrombosis after simultaneous bilateral total knee arthroplasty through early recognition, multidisciplinary assessment, and non-invasive medical management rather than surgical revascularization.
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
Knee replacement surgery is a routine procedure that restores mobility to millions of people suffering from severe arthritis. It involves removing damaged bone and cartilage and replacing them with metal and plastic components. While generally safe, the surgery carries a small but serious risk: the blood vessels behind the knee can become blocked by a clot. This blockage, known as a thrombosis, cuts off the blood supply to the lower leg. If not fixed quickly, the lack of blood can cause permanent nerve damage, tissue death, and even the loss of the limb. Doctors have long known that the standard response to such a crisis is immediate surgery to physically remove the clot or create a new path for blood flow. However, the precise moment when a limb is still safe enough to try a different approach, and how well that approach holds up over many years, has remained unclear.
A team of surgeons and researchers at The First Affiliated Hospital of Baotou Medical College recently shared the story of a 66-year-old woman who faced this exact danger. She had undergone a simultaneous double knee replacement, a procedure where both knees are operated on in a single session. About ten hours after the surgery, while she was resting in the hospital, her left leg began to feel wrong. She experienced sharp pain, numbness, and a distinct drop in temperature below the knee. Her skin turned pale, and the pulse in her foot, which had been strong before the operation, became very faint. These were the classic warning signs of a blocked artery.
When doctors examined her, they found that while her foot was cold and painful, she could still wiggle her toes. This small but critical detail meant that the nerves and muscles in her foot were still alive and receiving some oxygen, placing her in a category where the limb was threatened but not yet lost. Imaging scans confirmed that a large clot had formed in the main artery behind her left knee, stopping blood from flowing down to her foot. In the past, a patient in this situation would almost certainly have been rushed to an operating room for an invasive procedure to cut out the clot or bypass the blockage.
Instead, the medical team decided to try a different path. Because the woman's symptoms had appeared relatively quickly and her foot still had movement, the surgeons consulted with vascular specialists and chose to treat her with medication rather than immediate surgery. They administered drugs to thin the blood, relax the blood vessels, and dissolve the clot. For the next several days, the team watched her leg closely, checking her skin color, temperature, and pulse every few hours. They were prepared to switch to surgery instantly if her condition worsened, but it did not. Within six hours of starting the treatment, the color returned to her foot, the pulse became strong again, and the pain subsided. Over the following days, the blood flow continued to improve, and she was eventually discharged with a plan to take blood-thinning medication for three months.
What makes this case particularly valuable is what happened next. The researchers followed this woman for more than three years. During this time, she walked about 10,000 steps a day and regained full strength in her leg. Scans taken at the end of this period showed that the artery behind her knee remained open, with no sign of the clot returning or the vessel narrowing again. Her knee function was excellent, and she had no lingering pain or numbness. This long-term success in a single patient suggests that for patients who show up early with a blocked artery but still have movement in their toes, a careful, drug-based approach can be a viable option for saving the limb and preserving its function, though it does not prove this method is superior to surgery.
The study does not claim that medication should replace surgery for every patient. The doctors were very clear that if a patient had lost the ability to move their toes or if the tissue had begun to die, surgery would have been the only option. The key finding is that the decision must be made based on a careful, real-time assessment of the limb's condition. In this specific case, the combination of early detection, the preservation of toe movement, and a team of specialists working together allowed them to avoid a major operation. The patient's recovery over three years provides a detailed example of a stable, healthy outcome without the risks of a second major procedure, though the authors note that high-quality evidence regarding the indications and long-term outcomes of non-surgical management remains lacking and requires further study.
This report highlights the importance of watching for subtle changes after knee surgery. A sudden drop in temperature, a change in skin color, or a weakening pulse are not just normal post-surgery discomfort; they are signals that the blood supply is failing. By recognizing these signs immediately and assessing whether the limb is still salvageable, doctors can tailor their treatment to the individual. For some, that means a scalpel; for others, it might mean a carefully monitored course of medication. In this woman's case, the latter choice saved her leg and allowed her to return to an active life, proving that sometimes the most powerful tool in a medical crisis is the decision to wait, watch, and treat with precision rather than force.
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