MRI in patients with chronic pubalgia: Is precise useful information provided to the surgeon? A case-control study.

BACKGROUND: Recent studies described that MRI is a good examination to assess damage in chronic athletic pubalgia (AP). However, to our knowledge, no studies focus on systematic correlation of precise tendon or parietal lesion in MRI with surgery and histological assessment. Therefore, we performed a case-control study to determine if MRI can precisely assess Adductor longus (AL) tendinopathy and parietal lesion, compared with surgery and histology.

HYPOTHESIS: MRI can determine if AP comes from pubis symphysis, musculotendinous or inguinal orifice structures.

MATERIALS/METHODS: Eighteen consecutive patients were enrolled from November 2011 to April 2013 for chronic AP. To constitute a control group, we also enrolled 18 asymptomatic men. All MRI were reviewed in consensus by 2 skeletal radiologists for pubic symphysis, musculotendinous, abdominal wall assessment and compared to surgery and histology findings.

RESULTS: Regarding pubis symphysis, we found 4 symmetric bone marrow oedema (14%), 2 secondary cleft (7%) and 2 superior ligaments lesions (7%). For AL tendon, we mainly found 13 asymmetric bone marrow oedema (46%), 15 hyperaemia (54%). Regarding abdominal wall, the deep inguinal orifice size in the group of symptomatic athletes and the control group was respectively 27.3±6.4mm and 23.8±6.3mm. The correlation between MRI and surgery/histology was low: 20% for the AL tendon and 9% for the abdominal wall. If we chose the criteria "affected versus unaffected", this correlation became higher: 100% for AL tendon and 73% for the abdominal wall.

CONCLUSION: MRI chronic athletic pubalgia concerns preferentially AL tendinopathy and deep inguinal canal dehiscence with high correlation to surgery/histology when only considering the item "affected versus unaffected" despite low correlation when we try to precisely grade these lesions.

LEVEL OF EVIDENCE: III: case-control study.