Prevalence of the variations in the tendons of the extensor digitorum communis among the Burmese population

Introduction: The extensor digitorum communis (EDC) is essential in finger extension. Its tendons vary in distribution among and between different populations. These variations in anatomy can be very important for the diagnosis and management of hand injuries among hand surgeons, anatomists, and clinicians. This study is done to assess the variation of EDC tendons among the Burmese population and assess their distribution patterns on both hands. Methods: This is a cross-sectional anatomical study involving 32 cadavers (16 formalin-preserved and 16 fresh-frozen-acquired) from various medical institutions in Myanmar. A total of 64 dissected hands were observed for the number, pattern, and distribution of EDC tendons to the index (IF), middle (MF), ring (RF), and little fingers (LF). The Chi-square test was used to determine the statistical significance of tendon variations among the hands. Results: All IF had a single EDC tendon (100 %). The MF had single (50 %), double (37.5 %), and triple (10.9 %) tendons. The ring finger displayed single (9.4 %), double (50 %), triple (35.9 %), and quadruple (4.7 %) tendons. The LF showed an absent EDC tendon (60.9 %), a single tendon (34.4 %), and a double tendon (4.7 %). Asymmetrical tendon distribution was observed in 62 % of cadavers. Statistical analysis confirmed significant variations in EDC tendon distribution (p < 0.001). Conclusion: This study represents valuable data on anatomical variations in EDC tendons among a Burmese population and emphasises an individualised approach to surgery when dealing with tendon repair or hand reconstruction. The high incidence of asymmetrical patterns may alter functional and biomechanical results. Further investigation with advanced imaging techniques and samples of larger sizes is recommended regarding clinical implications.