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Unveiling foot tuberculosis as an under-recognized source of foot pain

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Abstract

Purpose

Foot tuberculosis is a rare form of osteoarticular tuberculosis, accounting for less than 1% of cases. It presents unique diagnostic challenges due to its nonspecific clinical features and overlapping symptoms with other conditions. This study aimed to investigate the clinical presentation, radiographic findings, and prognosis of foot tuberculosis, with the goal of improving early recognition and appropriate intervention.

Methods

A prospective study was conducted between November 2016 and July 2021, involving 39 patients diagnosed with foot tuberculosis. Clinical examinations, laboratory tests, X-rays, and MRI evaluations were performed to aid in the diagnosis. Biopsy was conducted on patients with radiological lesions. Patients were treated with an 18-month course of antitubercular therapy (ATT). Foot Function Index (FFI) scores were recorded before and after treatment. Statistical analysis was conducted to assess factors impacting prognosis.

Results

Unilateral foot involvement was observed in all patients, with a male predominance (61.5%) and a mean age of 31.3 years. The most common symptoms were pain and edema, with sinus tracts present in 17.9% of patients. Radiographic findings showed cystic and sclerotic lesions, with the "spina ventosa" appearance primarily affecting the metatarsal bones. MRI played a valuable role in early detection. Histopathological examination confirmed tuberculosis in all cases, and acid-fast bacilli were found in 23% of patients. Most patients (79.4%) responded well to ATT without requiring surgery. Factors such as high initial ESR, delayed ATT initiation, multiple lesions, and tarsal involvement were associated with unfavourable outcomes.

Conclusion

Foot tuberculosis presents with nonspecific symptoms, leading to misdiagnosis and delays in appropriate treatment. Clinical examination, radiographic evaluation, and biopsy are essential for accurate diagnosis. Early initiation of ATT is crucial for favourable outcomes. Factors such as high initial ESR, delayed treatment initiation, multiple lesions, and tarsal involvement negatively impact prognosis. This study highlights the importance of recognizing foot tuberculosis and provides insights into its clinical presentation, radiographic features, and treatment outcomes, facilitating timely intervention and improved patient management.

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Authors

Contributions

All Authors contributed significantly in idea of manuscript, patient care, writing of manuscript, critically analysing and revising of manuscript.

Corresponding author

Correspondence to Jatin Prakash.

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Informed consent was obtained from all individual participants included in the study.

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Taken from all participants.

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All authors declare that they have no conflict of interest.

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Level of evidence: Level IV

Key Points

• Foot TB is rare and often neglected differential in chronic foot pain. Clinicians must maintain a high degree of suspicion in all cases of unilateral foot pain over three weeks to diagnose these cases promptly.

• TB foot may have varied radiological presentation including lytic type, sclerotic type and spina ventosa type. All these presentation must be borne in mind while dealing the cases of chronic unilateral foot pain.

• Meticulous history and clinical examination, early MRI and timely biopsy of radiological lesion of foot is of paramount importance to help early diagnosis.

• Timely commencement of Anti-tubercular therapy is single most important factor that effects the prognosis of foot tuberculosis.

• Multi Drug resistant Tuberculosis should be kept in mind for all patients of TB foot that are not responding favourably to ATT.

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Prakash, J., Garg, J. & Vikas Unveiling foot tuberculosis as an under-recognized source of foot pain. International Orthopaedics (SICOT) 48, 389–400 (2024). https://doi.org/10.1007/s00264-023-05957-w

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