Interpreting Contemporary Outcomes in Popliteal Artery Entrapment Syndrome: The Importance of Long-term Surgical Experience

Dear Editor,

We read with great interest the systematic review by Cui and Wu on contemporary management and outcome reporting in popliteal artery entrapment syndrome (PAES). ¹ The authors should be congratulated for addressing a rare and heterogeneous vascular condition in which available evidence remains largely derived from retrospective series, narrative reviews, and multicenter observational experiences.^2,3

We particularly appreciated the inclusion of the recently published long-term institutional experience from our group on surgical treatment for PAES. ⁴ In that series, 47 patients and 78 limbs were treated over a long observational period, with systematic use of duplex ultrasound with provocative maneuvers and a mean follow-up of 181 months. Surgical decompression was performed in most limbs, whereas autologous venous bypass was reserved for cases with established arterial damage. Freedom from target lesion revascularization was 92.4%, and long-term patency was highly satisfactory, although outcomes differed between isolated musculotendinous section and arterial reconstruction. This difference likely reflects the more advanced disease stage of patients requiring bypass rather than the inferiority of reconstruction itself.

An additional issue deserves emphasis. Current major vascular guidelines do not provide dedicated PAES-specific recommendations for diagnosis, treatment, and surveillance. The 2024 ESVS (European Society for Vascular Surgery) guideline on asymptomatic lower-limb peripheral arterial disease and intermittent claudication explicitly lists popliteal entrapment among rare non-atherosclerotic causes of lower-limb arterial obstruction not covered by the document. ⁵ Similarly, the ESVS guideline on acute limb ischemia mentions PAES only among uncommon causes to be considered in the differential diagnosis, particularly in young active patients without atherosclerotic risk factors and with a history of claudication. ⁶ The 2024 multisocietary lower-extremity PAD (Peripheral Artery Disease) guideline, developed with the participation of the SVS (Society for Vascular Surgery), also does not provide a PAES-specific diagnostic, therapeutic, or follow-up algorithm. ⁷

This absence of dedicated guidance makes careful interpretation of the available observational evidence even more important. In PAES, the need for arterial reconstruction should not be considered merely as an alternative therapeutic strategy but also as a marker of delayed diagnosis, chronic arterial injury, impaired runoff, or post-stenotic degeneration. Therefore, combining anatomic PAES, functional PAES, decompression-only procedures, arterial reconstruction, endovascular adjuncts, and conservative management within descriptive pooled estimates may be useful for overview purposes, but it should not be translated into comparative therapeutic conclusions.

The PAES management should remain anatomy- and stage-driven. Functional PAES, anatomic PAES with preserved arterial integrity, and anatomic PAES complicated by stenosis, occlusion, or aneurysmal degeneration represent different clinical scenarios. Their outcomes should ideally be reported separately, particularly with respect to symptom relief, objective arterial patency, reintervention, return to activity, and duration of follow-up. Without this level of stratification, there is a risk of underestimating the prognostic importance of early diagnosis and overinterpreting results derived from heterogeneous single-arm data.

This message is consistent with previous clinical experience showing that timely recognition, dynamic imaging, and surgical decompression before irreversible arterial injury are key determinants of durable outcomes.^3,4,8 In this context, duplex ultrasound with provocative maneuvers remains a simple but essential diagnostic tool, particularly in young active patients with exertional symptoms and no clear atherosclerotic explanation. ⁸

Future studies and reviews should therefore prioritize standardized reporting of PAES subtype, baseline arterial status, dynamic imaging protocol, operative strategy, conduit type when reconstruction is required, runoff quality, and long-term surveillance. Such granularity would allow more meaningful comparisons across centers and would better inform treatment selection in this uncommon but clinically important condition.

In conclusion, Cui and Wu provide a valuable synthesis of the available literature. However, long-term surgical experience reinforces that the central objective in PAES remains prompt diagnosis and timely decompression before irreversible arterial damage occurs. ⁴ This message should remain central when interpreting contemporary outcome reporting and when proposing management algorithms for PAES.