Reliability of MRI findings of peroneal tendinopathy in patients with lateral chronic ankle instability.
BACKGROUND
Patients with chronic lateral ankle instability also have peroneal tendinopathy often. However, preoperative MRIs of these patients are vague in many cases. Our study was performed to see the reliability of MRI findings of peroneal tendinopathy in patients with chronic lateral ankle instability.


METHODS
MRI images for 82 patients who had chronic lateral ankle instability, and had received surgical treatment between March 2006 and November 2009 were compared with impressions from operating rooms. The mean age of patients was 36.4 years (range, 15 to 64 years), 82 ankles were studied, and patients with rheumatoid diseases were excluded from the study.


RESULTS
Of the 82 cases, 26 were true positives, 38 true negatives, 13 false positives and 5 false negatives. Of 39 cases of peroneal tendinopathy diagnosed from MRI, 14 had peroneal tendon partial tears, 15 tenosynovitis, 3 dislocations, 17 low-lying muscle bellies, and 6 peroneus quartus muscles. Of 31 cases of peroneal tendinopathy observed in surgery 11 had peroneal tendon partial tears, 4 tenosynovitis, 5 dislocations, 12 low-lying muscle belliess, and 1 peroneus quartus muscle. Sensitivity and specificity of peroneal tendinopathy were 83.9% and 74.5%, respectively. Positive predictive value was 66.7%. Negative predictive value was 88.4%. Accuracy rate was 78.0%.


CONCLUSIONS
MRI is a useful diagnostic tool for detecting peroneal tendinopathy in patients with chronic lateral ankle instability. However, MRI is vague in many cases. Therefore, a thorough delicate physical examination and careful observation is needed.
Department of Radiology, Myongji Hospital, Kwandong University College of Medicine, Goyang, Korea.
Hee Jin
HJ
Park
Seung Doh
SD
Cha
Hyung Soo
HS
Kim
Soo Tae
ST
Chung
Noh Hyuck
NH
Park
Jeong Hyun
JH
Yoo
Jai Hyung
JH
Park
Joo Hak
JH
Kim
Tae Woo
TW
Lee
Chang Hyun
CH
Lee
Se Man
SM
Oh
D000293:Adolescent; D000328:Adult; D000843:Ankle Joint / Q000601:surgery; D002908:Chronic Disease; D005260:Female; D006801:Humans; D007593:Joint Instability / Q000150:complications* / Q000601:surgery; D008279:Magnetic Resonance Imaging; D008297:Male; D008875:Middle Aged; D015588:Observer Variation; D011237:Predictive Value of Tests; D012680:Sensitivity and Specificity; D052256:Tendinopathy / Q000175:diagnosis* / Q000209:etiology / Q000601:surgery; D013708:Tendon Injuries / Q000150:complications / Q000175:diagnosis; D055815:Young Adult