Abstract:Objective To investigate the effect of the arthroscopy combined with C-arm X-ray to treat recurrent dislocation of the patella.Methods From October 2013 to May 2017,58 cases(63 knees)with recurrent dislocation of the patella were admitted in our center,including 26 males(28 knees)and 32 females(35 knees)with an average age of 21.81 years old(range,16~47 years).We tried to explore and repair patellofemoral articular surface injury under arthroscopy,released the lateral patellofemoral,tibia tubercles transposition,with dual-bundle free autogenously semitendinosus using two anchors( Smith & Nephew 3.5mm )to fix on the patella medial edge,with C-arm X-ray to reconstruct the Isometric point of the medial patellofemoral ligament and the 7 mm interference screw to fix on the femur.All patients were followed up for an average of 21 months(ranging 1~40).The imaging evaluation included Q angle,TT-TG,Insall-Salvati ratio,congruence angle,lateral patellofemoral angle and lateral shift.The clinical therapeutic effect was evaluated with International Knee Documentation Committee(IKDC),Lysholm.Results The fear test was negative after operation,There was no redislocation and fracture of the patella during follow-up.The congruence angle,lateral patellofemoral angle and lateral shift were(0.20±4.19)°,(3.52±1.33)° and(0.35±0.14)respectively at the final follow-up.The mean IKDC and Lysholm were(87.46±4.04)and(87.28±3.33)respectively at the final follow-up.And they were statistically different between the value before and after operation(P<0.05).Conclusion There is a reliable short-term effect to treat recurrent patella dislocation by the arthroscopy combined with C-arm X-ray to reconstruct the Isometric point of the medial patellofemoral ligament.
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