Comparison of X-ray film and MRI in the diagnosis of posterior ankle impingement syndrome / 实用放射学杂志

ABSTRACT

Objective To compare the diagnostic value of X-ray film and MRI in the posterior ankle impingement syndrome (PAIS).Methods X-ray film and MRI data of 72 cases with posterior ankle pain were analyzed retrospectively.Passive plantar flexion test and diagnostic blocking were used as the diagnostic criteria.72 patients with posterior ankle pain were divided into PAIS group and non PAIS group.X-ray film and MRI findings in the PAIS group and non PAIS group were compared,and features which had differential diagnostic value were selected for calculating and comparing the efficacy of X-ray film and MRI in diagnosing or excluding PAIS.Results There was no significant difference for X-ray film findings such as os trigonum osteosclerosis(χ2 =2.947,P =0.086),os trigonum cystic changes(χ2 = 3.031,P =0.082)and posterior ankle soft tissue swelling(χ2 = 1.610,P =0.205 )between the PAIS group and the non PAIS group.There was significant difference for MRI features such as os trigonum or posterior talus bone marrow edema(χ2 =38.868,P =0.000 ),edema around os trigonum(χ2 =39.919,P =0.000 )and tenosynovitis of the flexor hallucis longus (χ2 =8.854,P =0.003)between the PAIS group and the non PAIS group.There was no significant difference for MRI features such as posterior ankle synovitis(χ2 =2.534,P =0.119)and posterior ankle ligament thickening(χ2 =1.515,P =0.218)between the PAIS group and the non PAIS group.Conclusion Using passive plantar flexion test and diagnostic blocking as the gold standard,the diagnostic efficacy of MRI on PAIS is obviously higher than that of X-ray film.MRI can significantly improve the diagnostic accuracy of PAIS,and avoid unnecessary diagnostic blocking.