| Objective: The triangular fibrocartilege complex(TFCC) markedlycontributes to the stabilization of the distal radioulnar joint(DRUJ) and theulnar carpus via the ulnar carpal ligament complex.Recent biomechanicalstudies have evaluated that the DRUJ stability after traumatic TFCClesions. But biomechanical studies of wrist stability after TFCC lesions wereseldom.The present study to evaluate changes in stability of the wrist afterexperimental traumatic TFCC, and to provide basic theoretical criteria forclinic treatment.Methods and Material: Twelve adult cadaver wrist specimens wereincluded. The specimens were tested in a INSTRON 8874 biomechanicsmeasuring instrument. First the intact specimen was tested,second a dorsalarthrotomy was performed,and the third test was with 1 of 4 differentexperimental lesions according to Palmer' s classification of traumaticTFCC(1A-1D). Forced internal/external rotation torque were recorded in theinterval-60°+60°of flexion.Results: The dorsal arthrotomy were found to be significantly related to wrist stability.The 1C lesion were found to be highly significantly related to wriststability.Forced internal/external rotation torque were altered signigicantly inabout 30°～60°of wrist extention/flexion. The 1B lesion of ulnar avulsionwith fracture of the ulnar styloid alters significantly the stability of thewrist.The 1A and 1D lesions did not alter the stability of wrist significantly.Conclusions: The 1A lesions did not alter significantly wrist stability andhence the common treatment by a two-third excision of the central part of thedisk will not affect wrist stability.The 1B lesion of ulnar avulsion withfracture of the ulnar styloid were noticed because it alters the stability of thewrist.The 1C lesion alters significantly the stability of the wrist,this might beused in a clinical test for a 1C lesion. |
