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2022, Vol. 26 ›› Issue (6): 934-937Stability of patellar claw versus loop plate combined with patellar claw for the treatment of comminuted fractures of the lower pole of the patellaDuan Chao1, Shang Xiaoqiang1, Duan Xianglin1, Yang Ping1, Tao Shengxiang2
Abstract: BACKGROUND: After the comminuted fracture of the lower pole of the patella is sutured with the patellar ligament, the patellar concentrator can also increase the holding power of the lower pole. Some scholars report that the internal fixation method is firmly fixed without loosening, and early rehabilitation can be performed, but it is irritating risk of soft tissue and damage to cartilage. OBJECTIVE: To study the mechanical stability of loop plate combined with patellar claw technique in the treatment of the comminuted fracture of the inferior patella through the cadaver biomechanical experiment. METHODS: Totally six fresh adult cadavers were selected, including 12 knee joints, which were made into the model of comminuted fracture of the lower pole of patella by swing saw. One side of patella was fixed by loop plate combined with poly patella claw to form the experimental mechanical model. The other side was fixed by poly patella claw to form the experimental mechanical model. The loading test was carried out on the patella ligament. The maximum tension of 1 mm and 2 mm of fracture end separation was recorded respectively by loading load, and statistical analysis was performed. The experimental study was approved by the Plenary Meeting of the Ethics Committee of Wuhan Red Cross Hospital (approval No. 20161201). RESULTS AND CONCLUSION: (1) The maximum tension of 1 mm and 2 mm was (254.35±9.14) N and (274.23±15.06) N in the loop plate combined with patellar claw fixation group, respectively. The maximum tension of 1 mm and 2 mm was (106.00±4.79) N and (120.62±5.73) N in the patellar claw fixation group, respectively. The maximum tension of the loop plate combined with patellar claw fixation group was significantly higher than that of the patellar claw fixation group (P < 0.001). (2) The findings indicate that the treatment of comminuted fracture of the lower patella with loop plate combined with patellar claw is stable, safe and reliable in biomechanics, and can be used for passive rehabilitation exercise in the early stage. Key words:patella, biomechanics, poly patellar claw |