Abstract
To the Editor,
We read with great interest the randomized controlled trial by Limthongkul et al. 1 investigating the effects of postoperative limaprost on patient-reported outcomes following decompressive and fusion lumbar spine surgery. The authors reported that limaprost did not significantly improve postoperative leg numbness, tingling, or leg pain compared with placebo, while an unexpected yet notable benefit was observed in reducing back pain. Nevertheless, several methodological considerations warrant further discussion to better contextualize these findings and guide future research.
One important area for future investigation is the qualitative assessment of postoperative sensory symptoms. 2 The current study primarily relied on VAS scores, which quantify the severity of numbness but do not capture its sensory characteristics, distribution, or neuropathic features. Different qualities of numbness, such as burning, tingling, or electric shock sensations, may reflect distinct underlying mechanisms and could respond differently to treatments like limaprost. Incorporating validated neuropathic pain questionnaires, sensory descriptors, and detailed mapping of numbness distribution in future studies could provide a more comprehensive understanding of postoperative sensory recovery and help identify patient subgroups more likely to benefit from targeted therapies.
A key limitation of this study is the lack of stratification based on the severity or chronicity of preoperative nerve compression. Patients with varying degrees of nerve injury may recover at different rates, 3 and pooling them together could obscure potential benefits of limaprost. Those with more chronic or severe nerve damage may be less responsive to therapies targeting microcirculation. Future studies should consider using objective measures of nerve injury, such as electrodiagnostic tests or advanced imaging, to identify patients most likely to benefit from limaprost.
Another important limitation is the absence of psychological assessment. Factors such as anxiety, depression, and pain catastrophizing are known to influence the perception of pain and sensory disturbances and may affect postoperative symptom reporting. 4 Without evaluating these variables, it is difficult to determine whether differences in numbness or pain scores reflect true neurophysiological recovery or variations in emotional and cognitive responses to surgery. Incorporating validated psychological instruments, such as the Pain Catastrophizing Scale or the Hospital Anxiety and Depression Scale, in future studies would enable a more comprehensive understanding of how psychological status interacts with postoperative recovery and could help identify patient subgroups who respond differently to interventions like limaprost.
The authors should be commended for conducting a well-designed, double-blind, placebo-controlled trial addressing an important clinical problem—persistent postoperative leg numbness, which often persists despite technically adequate decompression. Their work provides valuable insight into postoperative recovery and highlights the need for further mechanistic and long-term studies to clarify the role of limaprost in postoperative spine care.
