Clinical Scorecard: Intraoperative Fragile Bone and Radiographic Sclerosis in a Case of Skeletal Fluorosis

At a Glance

Key Highlights

• Radiographic findings include increased bone density, thickened and fused trabeculae, thickened cortical bone, and narrowed marrow cavity.
• Intraoperative findings may reveal severe osteoporosis and fragile bone despite preoperative radiographic sclerosis.
• Special surgical exposure and release techniques are necessary to manage stiff joints and reduce fracture risk.

Guideline-Based Recommendations

Diagnosis

• Evaluate patients from endemic areas with history of high fluoride exposure presenting with joint pain and stiffness.
• Use radiographs to identify osteocondensation, ligament ossification, and trabecular changes.
• Consider urinary fluoride levels and clinical signs such as dental fluorosis for diagnosis.

Management

• Plan staged total knee arthroplasty with careful preoperative assessment of bone quality and soft tissue flexibility.
• Use low drilling torque and gentle bone handling intraoperatively to avoid fractures.
• Employ cement fixation for prostheses due to poor bone quality.

Monitoring & Follow-up

• Postoperative functional scores (e.g., Hospital for Special Surgery knee score) to assess recovery.
• Radiographic follow-up to confirm prosthesis positioning and alignment.
• Monitor for complications related to fragile bone and soft tissue stiffness.

Risks

• Increased risk of periprosthetic fractures due to intraoperative osteoporosis.
• Difficulty in surgical exposure due to ligament and capsule calcification.
• Potential misdiagnosis due to discrepancy between radiographic sclerosis and actual bone fragility.

Patient & Prescribing Data

59-year-old woman from high-fluoride endemic area with 15 years of knee symptoms and dental fluorosis.

Staged bilateral total knee arthroplasty with cemented prostheses and modified surgical techniques resulted in improved knee function and pain relief.

Clinical Best Practices

• Preoperative evaluation must include assessment of bone quality and soft tissue flexibility in patients from endemic areas.
• Prepare for intraoperative fragile bone despite radiographic sclerosis; use gentle bone cutting and low torque drilling.
• Apply special exposure and ligament release techniques to safely evert the patella and access the joint.
• Use cement fixation for prostheses to accommodate poor bone quality.
• Encourage early postoperative mobilization to improve functional outcomes.

References

• Hagen and Grinsberg classification of skeletal fluorosis stages
• Standards for the Hygiene of Drinking Water in China