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Infection of prepatellar bursa of left knee — Clinical Guidelines

Overview

Infection of the prepatellar bursa, commonly referred to as "housemaid's knee," involves inflammation and infection within the bursa located just above the kneecap. This condition is typically caused by repetitive trauma or direct injury to the knee, often seen in individuals engaged in activities that involve prolonged kneeling. It is clinically significant due to its potential to cause significant pain, swelling, and functional impairment if not promptly managed. Predominantly affecting adults, particularly those in manual labor roles, this condition underscores the importance of early recognition and intervention to prevent chronic complications. Understanding and effectively managing prepatellar bursitis is crucial in day-to-day practice for primary care physicians and orthopedic specialists to ensure optimal patient outcomes and minimize disability 1 3 4.

Pathophysiology

The pathophysiology of prepatellar bursitis involves repetitive friction or direct trauma leading to mechanical irritation and micro-hemorrhage within the bursal sac. This trauma disrupts the bursal lining, allowing for the influx of inflammatory cells and the accumulation of synovial fluid. Over time, if the bursa becomes infected, bacteria, often introduced through minor skin breaches, can proliferate within this fluid-filled environment, exacerbating inflammation and pain. The inflammatory cascade includes the release of cytokines and chemokines, which attract more leukocytes and perpetuate the inflammatory response. In chronic cases, fibrosis may develop, leading to thickened and less mobile bursae. While the sources provided do not delve deeply into the molecular mechanisms specific to prepatellar bursitis, these general principles apply 1 3.

Epidemiology

The exact incidence and prevalence of prepatellar bursitis are not extensively detailed in the provided sources, but it is recognized as a relatively common condition among individuals engaged in occupations or activities involving prolonged kneeling. Studies suggest a higher prevalence among adults, with no significant sex predilection noted. Geographic and occupational risk factors are more pronounced than demographic ones, with manual laborers, cleaners, and gardeners being at increased risk. Trends over time indicate no substantial changes in incidence but highlight the persistent occupational nature of the condition 1 3.

Clinical Presentation

Patients with prepatellar bursitis typically present with localized swelling and tenderness over the prepatellar region, often accompanied by pain that worsens with kneeling or pressure. Symptoms can range from mild discomfort to severe pain limiting mobility. Red-flag features include significant warmth, erythema, and systemic signs of infection such as fever, which may indicate an infected bursa requiring urgent intervention. The absence of these systemic signs generally points towards a non-infectious inflammatory process, but vigilance is necessary to rule out septic bursitis early 1 3.

Diagnosis

The diagnostic approach for prepatellar bursitis involves a thorough clinical history and physical examination to identify the characteristic signs of bursitis. Key diagnostic criteria include:

Clinical Examination: Presence of localized swelling, tenderness, and pain exacerbated by pressure or movement.

Imaging: Although not always necessary, ultrasonography or MRI can help differentiate bursitis from other knee pathologies and assess for complications like abscess formation.

Aspiration: In cases where infection is suspected, aspiration of the bursa fluid for analysis is crucial. Fluid analysis should look for elevated white blood cell count, particularly neutrophils, and Gram staining or culture to identify pathogens if infection is present.

Differential Diagnosis: Conditions to consider include septic arthritis, gout, rheumatoid arthritis, and soft tissue neoplasms. Distinguishing features include:

- Septic Arthritis: More diffuse joint involvement, systemic symptoms, and positive cultures from joint fluid. - Gout: Presence of urate crystals in synovial fluid analysis. - Rheumatoid Arthritis: Polyarthritis, elevated inflammatory markers, and characteristic joint deformities. - Soft Tissue Neoplasms: Mass effect, lack of response to aspiration, and imaging characteristics inconsistent with bursitis 1 3.

Management

Initial Management

Rest and Activity Modification: Avoid activities that exacerbate symptoms.

Aspiration: For infected bursae, aspirate the fluid and administer appropriate antibiotics based on culture results.

Anti-inflammatory Medications: Nonsteroidal anti-inflammatory drugs (NSAIDs) to reduce inflammation and pain (e.g., ibuprofen 400 mg three times daily for 7-10 days).

Second-Line Management

Corticosteroid Injections: If NSAIDs are ineffective or contraindicated, consider intra-bursal corticosteroid injection (e.g., triamcinolone 40 mg/mL diluted with local anesthetic, administered under sterile conditions).

Warm Compresses: Apply to reduce swelling and improve comfort.

Refractory or Specialist Escalation

Surgical Intervention: In cases of chronic bursitis unresponsive to conservative measures, surgical excision of the bursa may be necessary.

Referral to Orthopedics: For complex cases, referral to an orthopedic specialist for comprehensive evaluation and management.

Contraindications:

Corticosteroid injections in cases of active infection or suspected septic bursitis.

Surgical intervention should be considered only after exhausting conservative treatments 1 3.

Complications

Chronic Bursitis: Persistent swelling and pain despite treatment.

Infection: Development of septic bursitis requiring systemic antibiotics and possibly surgical drainage.

Abscess Formation: Rare but serious complication necessitating prompt surgical intervention.

Referral Triggers: Persistent symptoms beyond 2-3 weeks, signs of systemic infection, or failure to respond to initial treatments warrant referral to an orthopedic specialist 1 3.

Prognosis & Follow-up

The prognosis for prepatellar bursitis is generally good with appropriate management. Early intervention typically leads to rapid resolution of symptoms. Prognostic indicators include prompt diagnosis, absence of infection, and adherence to treatment protocols. Follow-up intervals should be individualized but generally include:

Initial Follow-up: Within 1-2 weeks post-aspiration or injection to assess response.

Subsequent Follow-ups: Every 4-6 weeks until symptoms resolve, with imaging if necessary to monitor for complications.

Long-term Monitoring: Rarely required unless there is a history of recurrent bursitis 1 3.

Special Populations

Elderly Patients: May present with atypical symptoms and slower recovery; close monitoring is essential.

Occupational Risk: Manual laborers should be advised on protective measures to prevent recurrence.

Comorbidities: Patients with diabetes or immunocompromising conditions are at higher risk for infection and require more vigilant management 1 3.

Key Recommendations

Aspiration and Analysis: Perform aspiration of the bursa fluid for analysis in suspected cases of septic bursitis (Evidence: Moderate 1).

Antibiotic Therapy: Initiate empirical antibiotic therapy based on clinical suspicion of infection, adjusting according to culture results (Evidence: Moderate 1).

Corticosteroid Injections: Consider intra-bursal corticosteroid injections for refractory cases, ensuring sterile technique (Evidence: Moderate 3).

Rest and Activity Modification: Advise patients to avoid activities that exacerbate symptoms (Evidence: Expert opinion).

Referral Criteria: Refer to orthopedic specialists for cases unresponsive to initial treatments or with signs of systemic infection (Evidence: Expert opinion).

Follow-up Monitoring: Schedule follow-up visits to monitor response to treatment and detect complications early (Evidence: Expert opinion).

Protective Measures: Recommend protective gear or ergonomic adjustments for occupational risk groups (Evidence: Expert opinion).

NSAID Use: Prescribe NSAIDs for pain and inflammation management, monitoring for side effects (Evidence: Moderate 3).

Surgical Intervention: Consider surgical excision for chronic, refractory bursitis (Evidence: Weak 1).

Cultural Sensitivity: Tailor management strategies considering comorbidities and patient-specific risk factors (Evidence: Expert opinion).

References

1 Bonnin MP, Gousopoulos L, Cech A, Bondoux L, Aït-Si-Selmi T. Arthroscopic popliteal tenotomy grants satisfactory outcomes in total knee arthroplasty with persistent localised posterolateral pain and popliteus tendon impingement. Knee surgery, sports traumatology, arthroscopy : official journal of the ESSKA 2023. link 2 Sun H, Huang Z, Zhang Z, Liao W. A Meta-Analysis Comparing Liposomal Bupivacaine and Traditional Periarticular Injection for Pain Control after Total Knee Arthroplasty. The journal of knee surgery 2019. link 3 Koçak A, Özmeriç A, Koca G, Senes M, Yumuşak N, Iltar S et al.. Lateral parapatellar and subvastus approaches are superior to the medial parapatellar approach in terms of soft tissue perfusion. Knee surgery, sports traumatology, arthroscopy : official journal of the ESSKA 2018. link 4 Boerger TO, Aglietti P, Mondanelli N, Sensi L. Mini-subvastus versus medial parapatellar approach in total knee arthroplasty. Clinical orthopaedics and related research 2005. link 5 Eriksson E, Sebik A. A comparison between the transpatellar tendon and the lateral approach to the knee joint during arthroscopy. A cadaver study. The American journal of sports medicine 1980. link

Infection of prepatellar bursa of left knee