Preoperative clinical, functional, and psychological factors associated with kinesiophobia at 6 months after anterior cruciate ligament reconstruction: a prospective cohort study
This prospective cohort study of 177 patients found that preoperative kinesiophobia and lower psychological readiness to return to sport were the strongest predictors of kinesiophobia six months after ACL reconstruction, whereas preoperative objective clinical and functional measures did not provide stable incremental explanatory value.
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
When a person tears the ligament that stabilizes the knee, the path to recovery often feels like a journey with two distinct maps. One map charts the physical repair: the surgeon mends the torn tissue, and months of rehabilitation rebuild strength and balance. The other map charts the mind: the patient must overcome a deep-seated fear that moving the knee will cause it to break again. This fear, known as kinesiophobia, is a powerful force. It can cause a person to avoid activity even when their knee is physically strong enough to handle it, potentially stalling their return to sports or daily life. While doctors have long known that physical strength matters, it has remained unclear whether the body's objective performance—how well a person actually balances or walks—can predict this lingering fear, or if the fear is rooted more deeply in the patient's pre-existing mindset before surgery even begins.
A team of researchers at Sichuan Provincial Orthopedics Hospital set out to untangle these threads by following 176 adults who were about to undergo surgery to reconstruct their anterior cruciate ligament. Before the operation, the team measured everything they could think of: the patients' age, weight, and the time since their injury; their physical strength and balance; and their psychological state. To gauge the mind, they asked patients to fill out questionnaires about their fear of movement, their confidence in returning to sports, and their levels of anxiety. They also put patients through rigorous physical tests, having them stand on one leg to measure sway, walk across a pressure-sensitive floor to analyze their steps, and use a machine to measure the exact force their hip and knee muscles could generate. The goal was to see which of these pre-surgery factors could best predict how afraid the patients would still be of their knee six months after the operation.
The results offered a clear, if somewhat surprising, hierarchy of influence. The strongest predictor of fear six months later was simply how afraid the patient was before the surgery began. Those who started with high levels of fear tended to still have high levels of fear half a year later. Equally important was a patient's psychological readiness to return to sport; those who felt confident and emotionally prepared to get back to their activities before the surgery were significantly less likely to be paralyzed by fear afterward. Interestingly, the researchers found that general anxiety and specific beliefs about one's ability to perform knee tasks were less reliable predictors when viewed alongside these two main factors. The study suggests that the fear of reinjury is a persistent trait that travels with the patient from the waiting room into the recovery phase, rather than something that fluctuates wildly based on minor physical changes.
Perhaps the most significant finding was what the physical tests failed to reveal. Despite the researchers' hope that objective data might offer new insights, the detailed measurements of balance, walking patterns, and muscle strength did not add any stable, extra value to the prediction. Even when the team combined all ten different physical metrics, they could not improve the accuracy of their forecast beyond what the psychological questionnaires already told them. The data showed that a patient's ability to stand perfectly still or generate maximum force did not reliably indicate whether they would be afraid to move six months down the line. The physical tests provided a snapshot of the body's current capability, but they did not illuminate the mind's future hesitation.
This distinction matters because it shifts the focus of care. If a patient's fear is not easily predicted by how well they can hop or balance, then relying solely on physical rehabilitation to cure that fear may be insufficient. The study indicates that the mental landscape of the patient before surgery is a critical window for intervention. By identifying those with high preoperative fear or low psychological readiness, doctors and therapists might be able to target these individuals for specific mental support or counseling early in the process. While the physical repair of the knee is essential, the research suggests that the emotional recovery is a separate, parallel track that is largely set in motion before the first incision is made. The body can be healed, but the fear of using it requires a different kind of attention, one that begins long before the physical tests are ever performed.
Drowning in papers in your field?
Get daily digests of the most novel papers matching your research keywords — with technical summaries, in your language.