| ObjectiveTo explore compression position of fibular myotube syndro- me and the necessity of early treatment.Methods24 dead body were were enrolled in this study.the S-shape incision starts from popliteal fossa to the lateral lower leg. The skin and subcutaneous tissue was cut and carefully separated.Observe how long the Common Peroneal Nerve next to the periosteum was in the fibular myotube, the property of peroneus longus fibrous arch, the distance from entrance and exit to fibular head, the Transverse diameter of Common Peroneal Nerve in the beginning of lateral groove and fibular myotube part and relative data of bifurcate of Superficial Peroneal Nerve and The deep peraoneal nerve.According to the clinicl manifestation , relative examinations, surgical findings and one to nine year follow-up for 45 patients, explore compression position of fibular myotube syndrome and the necessity of early treatment.ResultsCommon Peroneal Nerve in fibular myotube is in arc shape, closely adhered to fibular periosteum and has a length of 26.8±2.5 (20.5~33.6) mm. the distance between entrance to fibular myotub- e(which is Synovial fascia and the beginning of fibular muscle) and fibular head is 14.1±1.7(9.3~17.9)mm. Different types of the exit are as follows :Tendinous fibrous tissues occupies 13.1%; the muscle was of muscular origin in 63.6 % and the mixed type 78.2%.it has a distance of 34.6±3.1(30.0~49.3) mm from fibular head. lengths of common peroneal nerve travelling closely with the periosteum of the neck of fibula are 26.8±2.5(20.5~33.6) mm. The arc of muscle peroneuslongus constructed the vault of peroneal tunnel,and 7.4% of them are tendonous,3.1% are muscle,and 89.5% are a mixture of the two. The diameter of th former is 4.3±0.7(2.8~ 6.5)mm, and the later 6.2±0.3(4.7~6.2)mm. The diameter in bifurc- ate of Superficial Peroneal Nerve and the deep peraoneal nerve is 6.3±0.6(4.8~7.9)mm. clinical Materials show that 38 of 58 patients are male,20 female. fibular myotube syndrome has a direct relationship with trauma according to the operation findings. The causes are confirmed by operation as follows: encrust in the beginning of Peroneus Longus fiber(49), ganglion of Peroneus Longus(5), old blood stasis(2) and Ecchondroma of fibular neck(2). 45 patients were followed up after operation with s Follow-up rate 74.6%. The excellent and good rate of function recovery is up to 91.2%.ConclusionThe anatomy basis for easy compression of Common Peroneal Nerve, according to our study, is: anatomy of dense of fibular myotube, early bifurcation of the Common Peroneal Nerve, its bad mobility and its closely adherence to the periosteum that results relative fixed position.the Disease Inducement of compression is abnormal posture or long time repeated movement of knee joint. Further study of fibular myotube revealed that Common Peroneal Nerve is wider before into it. Peripheral connective tissues is more rich especially in the bifurcate of Superficial Peroneal Nerve and The deep peraoneal nerve. So we conclude it is the place fibular myotube syndrome happened easily. This is a guidance to the futher operation path.The main conclusion: 1. the main reason of Fibular myotube syndrome is repeated mechanical activity that results in the thickening of the beginning of Peroneus Longus fiber. Trauma is a direct reason that can not be neglect.2. early diagnosis and early treatment to Fibular myotube syndrome is a main factor to improve the living quality. The reco- very stage of nerve function is difference according to individual variation. Some may recovery fast, while someone needs years to recover.
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