Journal Article

Patients Older Than 40 Years With Unilateral Occupational Claims for New Shoulder and Knee Symptoms Have Bilateral MRI Changes

Edwards, Leonard, Leung, Nina, Ring, David, Liu, Tiffany C., Bernacki, Edward, Tonn, Melissa D.

2017

Overview

Background Minor events that occur in the workplace sometimes are evaluated with MRI, which may reveal age-related changes in the symptomatic body part. These age-related changes are often ascribed to the event. However, evidence of similar or worse pathophysiology in the contralateral joint would suggest that the symptoms might be new, but the pathophysiology is not. Questions/purposes Using a convenience sample of occupational injury claimants with bilateral MRI to evaluate unilateral knee or shoulder symptoms ascribed to a single event at work, we sought to determine whether MRI findings of the shoulder and knee are more often congruent or incongruent with new unilateral symptoms. Methods Two hundred ninety-four occupational injury claimants employed at companies throughout Texas that do not subscribe to workers’ compensation insurance, who were older than 40 years, and with unilateral shoulder or knee symptoms, were studied. Starting in 2012, all patients seen by OccMD Group PA who present with unilateral symptoms ascribed to work undergo bilateral MRI, based on several previous occasions where bilateral MRI proved to be a compelling demonstration that perceived injuries are more likely age-related, previously well-adapted pathophysiology. MRI findings (anything described as abnormal by the radiologist; eg, defect size or signal change) was considered congruent if the abnormality of one or more structures on the symptomatic side was greater than that of the corresponding structures in the asymptomatic joint. Bivariate analysis was used to compare the frequency of MRI findings congruent and incongruent with symptoms. Logistic regression was used to evaluate factors associated with MRI findings of the shoulder or knee. Results Less than half of the patients with shoulder (90 of 189; 48%; p = 0.36) or knee (45 of 105; 43%; p = 0.038) symptoms had worse pathologic features on the symptomatic side. Older age was associated with disorders in the infraspinatus tendon (59 ± 8 versus 56 ± 8 years; p = 0.012), glenoid labrum (60 ± 9 versus 57 ± 8 years; p = 0.025), and biceps tendon (60 ± 8 versus 57 ± 8 years; p = 0.0038). Eighty-seven percent of patients (91 of 105) had structural changes in the medial meniscus described by the radiologist. Conclusions Occupational injury claimants 40 years of age and older with unilateral knee and shoulder symptoms ascribed to a work event tend to have bilateral age-related MRI changes. Age-related disorders should be distinguished from acute injury. Level of Evidence Level IV, diagnostic study.

• Publisher: Springer US,Lippincott Williams & Wilkins Ovid Technologies
• Subject: Adult / Age / Age Factors / Biomechanical Phenomena / Bodily injury / Clinical Research / Conservative Orthopedics / Disability Evaluation / Female / Geriatrics / Humans / Insurance, Disability - economics / Knee / Knee Joint - diagnostic imaging / Knee Joint - physiopathology / Labrum / Magnetic Resonance Imaging / Male / Medicine / Medicine & Public Health / Meniscus / Middle Aged / Musculoskeletal Diseases - diagnostic imaging / Musculoskeletal Diseases - economics / Musculoskeletal Diseases - physiopathology / Occupational Diseases - diagnostic imaging / Occupational Diseases - economics / Occupational Diseases - physiopathology / Occupational Health / Orthopedics / Predictive Value of Tests / Risk Factors / Shoulder / Shoulder Joint - diagnostic imaging / Shoulder Joint - physiopathology / Sports Medicine / Surgery / Surgical Orthopedics / Texas / Workers