Analysis Of The Influence Of Load Exercise On Ankle Cartilage Based On T2 Mapping Technique

Objective The purpose of this study is to evaluate the difference of T2 value of ankle talar cartilage between weightlifters and healthy volunteers through quantitative magnetic resonance imaging technology T2 mapping.Materials and Methods The participants of this study were 50 weightlifters(athletes group)recruited from the sports center from October 2021 to January 2022,and 100 healthy volunteers(volunteer group)recruited from October 2021 to May 2022.Siemens 3.0T MRI and8-channel special ankle imaging ring are used.Perform magnetic resonance scanning on all subjects,using conventional T2 WI,PDWI sequence and T2 mapping sequence.During the scanning,the participant was in supine position,and the foot and lower limb were scanned at an angle of 90 °.According to the T2 pseudo-color image obtained by each subject,the talar cartilage was manually divided into six parts: medial anterior(MA),medial center(MC),medial posterior(MP),lateral anterior(LA),lateral center(LC),and lateral posterior(LP).The average T2 value of each cartilage area was measured and calculated.the T2 value of total talar cartilage(TLC)was obtained from the average T2 value of six cartilage.The change value and growth rate of T2 value of each cartilage area in the weightlifter group compared with the corresponding T2 value in the volunteer group were calculated.Mann-Whitney U test was used to compare the difference of T2 value of each cartilage region between the weightlifter group and the volunteer group.Intragroup correlation coefficient was used to evaluate inter-observer reliability and intra-observer reliability.Results1.Enrollment of two groupsThis study included 50 athletes and 100 volunteers.Athletes and healthy volunteers met the good inclusion criteria.Finally,the cost study was completed with50 athletes and 100 volunteers.2.Images analysis of two groupsThe T2 values of each area of interest and the talar cartilage in 50 athletes’ groups were tested for normality,and it was found that the six areas of interest and the talar cartilage were all in accordance with the normal distribution(P>0.05),namely,the medial anterior area of the talar(P=0.416),the medial center area of the talar(P=0.165),the medial posterior area of the talar(P=0.273),the lateral anterior area of the talar(P=0.053),the lateral center area of the talar(P=0.244),the lateral posterior area of the talar(P=0.969)and the talar cartilage(P=0.172).The normal distribution of T2 values and talar cartilage in 100 volunteer groups was tested.It was found that three regions of interest were in accordance with the normal distribution(P>0.05),namely,the medial anterior region of the talar(P=0.350),the lateral anterior region of the talar(P=0.216),and the lateral center region of the talar(P=0.666);the three regions of interest and the cartilage of the talar did not conform to the normal distribution(P<0.05),which were the medial center region of the talar(P=0.040),the medial posterior region of the talar(P<0.001),the lateral posterior region of the talar(P<0.001)and the cartilage of the talar(P=0.038).Compare the T2 value of each area of interest and talar cartilage between the athlete group and the volunteer group,the T2 values of the six regions of interest and the talar cartilage in the athlete group were significantly higher than those in the volunteer group(P<0.05),which were the medial anterior region of the talar(P=0.001),the medial center region of the talar(P<0.001),the medial posterior region of the talar(P<0.001),the lateral anterior region of the talar(P<0.001),and the lateral center region of the talar(P<0.001)the lateral posterior area of the talar(P<0.001)and the cartilage of the talar(P<0.001).Compare the T2 value of each area of interest and talar cartilage between adult athletes and adult volunteers,the T2 values of the six regions of interest and the cartilage of the talar in the athletes group were significantly higher than those in the volunteers group(P<0.05),which were the medial anterior region of the talar(P=0.002),the medial center region of the talar(P<0.001),the medial posterior region of the talar(P=0.001),the lateral anterior region of the talar(P=0.005),the lateral center region of the talar(P<0.001)the lateral posterior area of the talar(P<0.001)and the cartilage of the talar(P<0.001).Compare the T2 value of each area of interest and talar cartilage between juvenile athletes and juvenile volunteers,the T2 values of the six regions of interest and the talar cartilage in the athletes group were significantly higher than those in the volunteers group(P<0.05),which were the medial anterior region of the talar(P<0.001),the medial center region of the talar(P<0.001),the medial posterior region of the talar(P<0.001),the lateral anterior region of the talar(P<0.001),the lateral center region of the talar(P<0.001)the lateral posterior area of the talar(P<0.001)and the cartilage of the talar(P<0.001).Compare the T2 value of each area of interest and talar cartilage between adult volunteers and juvenile volunteers,the T2 values of the six regions of interest and the talar cartilage of the athletes group were significantly higher than those of the volunteers group(P<0.05),which were the medial anterior region of the talar(P=0.001),the medial center region of the talar(P<0.001),the medial posterior region of the talar(P<0.001),the lateral anterior region of the talar(P<0.001),and the lateral center region of the talar(P<0.001)the lateral posterior area of the talar(P<0.001)and the cartilage of the talar(P<0.001).Compare the T2 value of each area of interest and talar cartilage between adult athletes and juvenile athletes,the T2 values of the six regions of interest and talar cartilage in the adult group were all higher than those in the juvenile group.However,four regions of interest showed significant differences(P<0.05),while the other two regions were not statistically significant,which were the medial anterior region of the talar(P<0.001),the medial center region of the talar(P=0.017),and the medial posterior region of the talar(P=0.028),the lateral anterior region of the talar(P=0.131),lateral center region of the talar(P=0.142),lateral posterior region of the talar(P=0.015),and talar cartilage(P<0.001).In the comparison between athletes and volunteers,the difference in the lateral posterior region of the talar is the largest and the growth rate is the highest;In the comparison between adult athletes and adult volunteers,the difference in the lateral posterior of the talar is the largest and the growth rate is the highest;In the comparison between juvenile athletes and juvenile volunteers,the difference between the medial posterior region of the talar is the largest,but the growth rate is the highest in the lateral center region of the talar;In the comparison between adult volunteers and juvenile volunteers,the difference between the medial posterior region of the talar is the largest,with the highest growth rate;In the comparison between adult athletes and juvenile athletes,the difference in the medial anterior region of the talar is the largest and the growth rate is the highest.There was significant inter-observer consistency between physicians W,K,and M(ICC=0.952).In addition,high reproducibility was observed for W,K,and M(ICCW =0.983,ICCK =0.977,ICCM =0.980).Conclusions1.Compared with volunteers,the T2 value of the ankle joint talar cartilage in athletes is significantly higher,and there is a tendency for degenerative lesions in the ankle joint cartilage of athletes.2.Compared with adult volunteers,the T2 value of ankle joint talar cartilage in adult athletes is significantly higher,and there is a tendency for degenerative lesions in the ankle joint cartilage of athletes.3.Compared with juvenile volunteers,the T2 value of ankle joint talar cartilage in juvenile athletes is significantly higher,and there is a tendency for degenerative lesions in the ankle joint cartilage of athletes.4.Compared with juvenile volunteers,the T2 value of ankle joint talar cartilage in adult volunteers is significantly higher.5.Compared with juvenile athletes,the T2 value of ankle joint talar cartilage in adult athletes is significantly higher.6.In the comparison group of juveniles,there was a more significant increase in the T2 value of ankle and talar cartilage compared to the adult comparison group,which may indicate that the talar cartilage of juveniles is more susceptible to overuse damage.