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Lead arthropathy: a cause of delayed onset lead poisoning
1Department of Diagnostic Radiology, University of Hong Kong, Queen Mary Hospital.
Insights
Retained bullet fragments in hip joints can cause lead intoxication, especially with extensive fragmentation. Surgical removal is effective for symptomatic patients, with outcomes depending on fragment surface area exposed to joint fluid.
Area of Science:
- Orthopedic Surgery
- Toxicology
- Ballistics Trauma
Background:
- Retained bullet fragments are common after gunshot wounds.
- Intra-articular fragments in the hip joint are less common.
- The clinical significance of retained bullet fragments is often minimal.
Observation:
- Three patients with retained bullets in their hip joints were studied.
- One patient with extensive intra-articular fragments developed lead intoxication.
- Two patients with bullets fully within the femoral head had no intoxication symptoms.
Findings:
- Extensive intra-articular fragmentation and high surface area of lead exposed to synovial fluid correlate with lead intoxication.
- Surgical removal of bullets and fragments led to good clinical outcomes in the symptomatic patient.
- The degree of fragmentation and lead exposure dictates the necessity of intervention.
Implications:
- Early identification of lead intoxication from intra-articular bullet fragments is crucial.
- Treatment decisions should consider the extent of fragmentation and lead exposure.
- This highlights a potential, albeit rare, complication of retained intra-articular bullet fragments.
Abstract:
Patients who suffer gun shot wounds often have retained bullet fragments within their bodies. These are usually of no clinical consequence. We describe three patients with retained bullets within their hip joints. One of these patients, who had extensive ground intra-articular bullet fragments and secondary osteoarthritis of the hip, presented with signs, symptoms, and laboratory data consistent with lead intoxication. The bullet and metallic fragments were removed surgically with good clinical response. Two patients whose bullets were implanted entirely within the femoral head and whose joints showed smaller degrees of lead fragmentation had no symptoms of lead intoxication. The degree of intra-articular fragmentation of the bullet and the surface area of lead exposed to synovial fluid are emphasized as decisive factors with respect to appropriate therapy.