Objective To analyze differences in patellar height changes based on X-ray imaging measurements on patients who received preoperative and postoperative follow-up with either fixed-bearing or mobile-bearing prosthesis implanted during unicompartmental knee arthroplasty.Methods Imaging data from patients with unilateral knee osteoarthritis who received uni-compartmental knee arthroplasty from September 2021 to September 2022 were selected for measurement and analysis.A total of 100 cases were included,with patients categorized into two groups based on the type of implanted prosthesis:fixed-bearing group(51 cases)and mobile-bearing group(49 cases).Patients undergoing bilateral unicompartmental knee arthroplasty were all implanted with the same type of prosthesis.Patellar height was measured using the Insall-Salvati(IS)and Caton-Deschamps(CD)ratios before and after surgery,and inter-group and intra-group comparisons were conducted.Results According to the results of the inter-subgroup analysis within the fixed-bearing group and the mobile-bearing group,there was a significant dif-ference in postoperative IS between the body mass index subgroups in the fixed-bearing group(P＜0.05),and IS was higher in the subgroups with a body mass index of ≥28 kg/m2,while there was no significant difference in the remaining subgroups(P＞0.05).There was a significant difference between preoperative and postoperative IS in the gender subgroup of the mobile-bearing group(P＜0.05),with preoperative and postoperative IS in the female subgroup higher than that in the male subgroup;there was a significant difference in preoperative CD in the age subgroup(P＜0.05),with preoperative CD being higher in the age＜65 subgroup;and there was a significant difference in postoperative CD in the body mass index subgroup(P＜0.05),with the subgroup with a body mass index ≥28 kg/m2 had higher postoperative CD.Based on the results of the inter-subgroup analy-sis between the fixed-bearing subgroup and the mobile-bearing subgroup,the preoperative IS was higher in the fixed-bearing subgroup for males and the subgroup with a body mass index of＜28 kg/m2 than in the mobile-bearing subgroup(P＜0.05),and the preoperative CD was higher in the mobile-bearing subgroup for those＜65 years of age than in the fixed-bearing subgroup(P＜0.05);there were no significant differences in postoperative period(P＞0.05);there was no significant difference in the compari-son of the rest of the measured parameters(P＞0.05).Conclusion The results of this study did not show any significant differ-ences between the two groups in age,gender,body mass index,and surgery procedure,except that in the fixed-bearing group,the preoperative IS was significantly higher in males and in the subgroup with a body mass index of＜28 kg/m2 compared with the subgroup in the mobile-bearing group.
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