Sternoclavicular tuberculosis: an atypical imitator of refractory shoulder pain.

Introduction: Sternoclavicular joint tuberculosis is rare and has been presented in literature with few sporadic case reports or small case series. Rarity of the condition, nonspecific symptoms, difficulty to visualise the area on X-rays, and minimal clinical signs make diagnosis of sternoclavicular tuberculosis extremely difficult. Delay in diagnosis is therefore the common feature of all presented reports in literature. We here present our experience of treating 19 cases of sternoclavicular tuberculosis at our centre.
Materials and Method: This is an observational study from 2010 to 2017 in a tertiary care referral hospital. All patients with clinical tenderness of sternoclavicular joint and shoulder joint pain of over three week duration were subjected to MRI. Patients who showed radiological lesions (radiography/MRI) were subjected to core biopsy under image guidance. A total of 26 patients had biopsy confirmed sternoclavicular tuberculosis (TB) during this period.
Results: All patients had improvement in shoulder function after treatment completion. Mean CSS pre-treatment was 29 which improved to mean of 8 after 18 months of ATT. Eight patients had excellent results, seven good, three fair, and one patient poor result. High initial ESR, late commencement of ATT from initial symptoms, and surgery of the involved joint were considered poor prognostic factors.
Discussion: Sternoclavicular tuberculosis is a rare disease with controversial etiology. Both haematogenous spread through suprascapular artery and contiguous spread through latent disease in apical lungs has been postulated. Delay in diagnosis is common to most reports in literature. Early MRI is useful in diagnosis of the lesion. The treatment for sternoclavicular joint in literature is controversial with proponents of both surgery and conservative management.
Conclusion: Primary sternoclavicular tuberculosis is rare condition and requires a high index of suspicion for an early diagnosis. A focused sternoclavicular MRI and early biopsy may help in timely diagnosis. Early commencement of ATT has overall good clinical and functional results.