Abstract:  Objective   To explore the application effect of NiTi shape memory ally four-corner arthrodesis concentrator (NT-FCAC) in the treatment of wrist collapse, and to report the efficacy of 9-10 years follow-up.    Methods    Thirty-two patients with four-corner arthrodesis and navicular osteotomy with NT-FCAC were selected for treatment of wrist collapse due to navicular osteogenesis imperfecta and navicular-moon-progressive wrist collapse. Goniometer was used to measure the wrist joint mobility. Jammar dynamometer was used to measure the grip strength. Quick DASH (Quick Arm, Shoulder, Hand Dysfunction Score) was used to observe the recovery of the limb function before and after the operation, and Visual Analogue Score (VAS) was used to assess the degree of the patients' wrist pain. Anteroposterior and lateral radiographs of the wrist joint were taken to observe the rate of carpal arthrodesis.    Results   Bone healing was obtained in all 32 carpal bones at 3 months postoperatively. At 9-10 years of follow-up, all patients had no serious surgical complications, the range of motion of the wrist joint reached more than 60% of the healthy side, and the grip strength of the affected hand was restored to 80.78% of that of the healthy side. The VAS score was reduced from the preoperative score (5.97±0.86) to the final follow-up (0.16±0.37), the Quick DASH score was reduced from the preoperative score (70.00±4.76) to the final follow-up (6.16±0.37). There were statistical differences in the preoperative  VAS and Quick DASH scores and  the VAS and Quick DASH scores at each follow-up.    Conclusions    The application of NT-FCAC for four-corner arthrodesis of the carpal bones has a high rate of carpal fusion, preserves most of the functions of the carpal joints, and has a good long-term efficacy, which is suitable for carpal collapse that requires four-corner arthrodesis.

Key words: Wrist; ,  , Carpal collapse; ,  , Four-corner arthrodesis