Stages of the pathological process
Tuberculous joint involvement goes through several consistent phases, each with its own clinical features:
- Arthritic phase (peak stage). Accompanied by general symptoms of intoxication (poor appetite, sleep disturbance due to night pain). The pain is persistent and intensifies with movement. Externally, the joint is deformed, and the limb muscles are atrophied (hypotrophy). Fluid accumulation (hydrarthrosis), local hyperthermia, and marked tenderness are characteristic. The range of motion is minimal. There is a high risk of cold abscesses, the rupture of which leads to fistula formation.
- Remission stage. The clinical picture gradually subsides. Pain resolves, but the joint remains restricted in mobility.
- Post-arthritic phase. Acute inflammation subsides. Long-term consequences come to the foreground—contractures and the development of secondary osteoarthritis. Patients complain of "starting" pain and discomfort during physical exertion. Complete joint block (ankylosis) is possible.
Instrumental and laboratory diagnostics
The choice of imaging modality depends on the disease duration. In the early stages (pre-arthritic phase), conventional radiography often shows no changes; therefore, CT or MRI is required for early detection of osteitis or arthritis. In the peak stage, radiography becomes highly informative.
Definitive confirmation of the specific nature of the inflammation requires laboratory verification. This involves histological and bacteriological examination of synovial fluid, fistula contents, or biopsy tissues. Tuberculin skin tests and blood tests are used as auxiliary methods.
Principles of surgical treatment
Therapy is always multimodal: specific antibiotics are used in combination with surgical treatment. The scope of surgery is determined by the phase of the process:
- Early stages: limb-sparing interventions are performed—necrectomy or conservative resection.
- Peak stage: requires wide resection of articular surfaces, excision of the inflamed synovial membrane, as well as opening and drainage of abscesses. To prevent functional failure of the joint, the surgery is often completed with arthrodesis (joint fusion) in a functionally advantageous position.
- Post-arthritic phase: surgeries (corrective osteotomies, myotomies) are aimed at correcting contractures and relieving pain. In case of significant joint destruction, arthrodesis or joint arthroplasty is performed, which is increasingly becoming the method of choice as it restores mobility.
Dispensary follow-up (Group V)
Following surgery, patients are subject to follow-up at tuberculosis dispensaries. All extrapulmonary forms belong to Dispensary Group V, which is divided into four sub-groups depending on inflammation activity:
- Subgroup A (Active process): patients with exacerbations, relapses, or recent surgeries. Require prolonged treatment. 6–12 months after sustained resolution of the process, they may be transferred to the next subgroup.
- Subgroup B (Resolving process): patients with normalized indicators. Anti-relapse courses of chemotherapy are administered in spring and autumn (1–3 months each). Follow-up lasts for at least 2 years due to the risk of exacerbations.
- Subgroup C (Clinical recovery): specific therapy is discontinued, with an emphasis on general supportive treatment. Duration—from 2 years.
- Subgroup D (Removal from register): individuals are monitored with annual check-ups for 5–10 years until final removal from the register.
Briefly: answers to topical questions
What clinical phases are distinguished in the development of tuberculous joint involvement?
Three main clinical phases are distinguished in the development of tuberculous joint involvement.
- Pre-arthritic phase (Phase I)—characterized by the formation of an isolated bone lesion in the epiphysis near the joint.
- Arthritic phase (Phase II)—the peak stage, during which inflammation breaks through from the bone into the joint with the development of secondary arthritis. It also includes the remission stage, where clinical manifestations gradually regress.
- Post-arthritic phase (Phase III)—outcome and stabilization of the process, characterized by impaired joint function up to ankylosis and the development of secondary osteoarthritis.
What radiological signs are characteristic of the pre-arthritic stage of bone and joint tuberculosis?
In the pre-arthritic stage of bone and joint tuberculosis, routine radiography is of low diagnostic value due to the paucity of findings. Specific radiological signs at this stage are practically absent, so classical X-ray examination does not reliably detect the pathology. For early detection of tuberculous osteitis or arthritis in this phase, more modern and sensitive imaging methods such as computed tomography (CT) and magnetic resonance imaging (MRI) are indicated.
Which specific drugs are used for specific antibiotic therapy of bone and joint tuberculosis?
The provided sources indicate that the treatment for osteoarticular tuberculosis is combined: antibacterial therapy and surgical methods. The necessity of prolonged specific therapy until the process subsides is also noted.
The specific list of drugs precisely for osteoarticular tuberculosis is not provided in the sources. The following drugs and combinations are named from general anti-tuberculosis therapy regimens:
- Isoniazid + rifampicin + pyrazinamide or ethambutol.
- Isoniazid + rifampicin.
- Instead of rifampicin, rifapentine may be prescribed in the continuation phase.
- In drug resistance, the sources mention regimens accounting for resistance to isoniazid, rifampicin, fluoroquinolones, as well as Group A drugs: bedaquiline and linezolid.
Class and exam questions
In the pre-arthritic phase and the beginning of the arthritic phase, the radiological picture is too sparse. CT or MRI is required to detect early bone and cartilage tissue changes.
In the pre-arthritic phase and the beginning of the arthritic phase, the radiological picture is too sparse. CT or MRI is required to detect early bone and cartilage tissue changes.
Which diseases are used for differential diagnosis in the peak stage?
With pyogenic arthritis, epiphyseal hematogenous osteomyelitis, and Ewing sarcoma.
What does anti-relapse therapy consist of?
In Subgroup B (resolving process), patients are prescribed prophylactic courses of anti-tuberculosis drugs for 1–3 months in autumn and spring periods.
What else to study on this topic
- Clinical picture of the pre-arthritic phase
- Features of tuberculin skin tests and their interpretation
- Regimens of conservative antibiotic therapy
- Types of corrective osteotomies in the post-arthritic phase
- Differential diagnosis with Brodie's abscess and Ewing's sarcoma
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