# A 10-year-old child is admitted to the pediatric unit with suspected osteomyelitis of the left tibia. Which assessment finding would be most indicative of osteomyelitis in this child? > source: MyMerci (mymerci.kr) > url: https://mymerci.kr/pages/nclex_q.php?qn_id=542393 > language: ko > subject: Child Health ## 문제 A 10-year-old child is admitted to the pediatric unit with suspected osteomyelitis of the left tibia. Which assessment finding would be most indicative of osteomyelitis in this child? ## 보기 1. Decreased range of motion in the affected extremity 2. Swelling and erythema around the joint 3. Point tenderness over the bone with refusal to bear weight **✔ 정답** 4. Low-grade fever with general malaise **정답: 3** ## 해설 Point tenderness over the bone with refusal to bear weight is the most specific finding for osteomyelitis in children, indicating localized bone infection. Other options (decreased ROM, swelling/erythema, low-grade fever) are less specific and can occur in various conditions. ## 심화 해설 Understanding the Clinical Presentation of Pediatric Osteomyelitis Differentiating osteomyelitis from other musculoskeletal conditions in children, such as septic arthritis, is a critical clinical skill. While these conditions share overlapping features like fever, pain, and refusal to move the limb, the precise location of the pathology dictates the specific assessment findings. In osteomyelitis, the infection is within the bone itself, leading to a distinct set of signs that differ from a joint infection. Why Point Tenderness Over Bone is the Hallmark Sign The most indicative finding for osteomyelitis is point tenderness over the affected bone accompanied by a refusal to bear weight. This occurs because the infectious process causes inflammation and increased pressure within the rigid bone medullary cavity. The exudate and edema stretch the periosteum, a membrane richly supplied with pain-sensitive nerve fibers, resulting in exquisite, localized pain directly over the infected site. This is a classic and reliable sign that helps localize the problem to the bone rather than the joint space. A key diagnostic pitfall, as highlighted in the literature, is that pelvic or proximal femoral osteomyelitis can mimic septic arthritis of the hip, presenting with severe hip pain, limp, and inability to bear weight [2]. This overlap can lead to diagnostic delays or unnecessary surgical exploration of the joint. A case of Brodie's abscess, a form of subacute osteomyelitis, exemplifies this challenge, where a child's primary complaints were hip pain and an inability to bear weight, leading to an initial misdiagnosis [3]. This underscores why a meticulous physical assessment for precise, bony point tenderness is paramount. Differentiating Osteomyelitis from Septic Arthritis The other options are more characteristic of septic arthritis or are non-specific findings, which is why they are not the most indicative for osteomyelitis. - Decreased range of motion in the affected extremity (Option 1) is a prominent feature of septic arthritis. In a joint infection, any movement, even slight, causes severe pain due to the inflamed synovium and purulent material within the confined joint space. While children with osteomyelitis will guard the limb, they may still have some passive range of motion at the adjacent joint, albeit with pain at the extremes of movement when the infected bone is stressed. - Swelling and erythema around the joint (Option 2) is a classic sign of septic arthritis, where the infection is contained within the joint capsule. In osteomyelitis, swelling and erythema are typically more diffuse, located over the shaft of the long bone, and are often later findings that indicate the infection has progressed through the cortex and periosteum into the surrounding soft tissues. A retrospective study analyzing children with these conditions found that specific clinical findings help differentiate them, although the abstract does not detail the exact frequencies . - Low-grade fever with general malaise (Option 4) is a non-specific systemic sign common to many infections, including both osteomyelitis and septic arthritis. While frequently present, as noted in case series where fever, limb pain, and swelling formed a presenting triad , it does not help localize the infection to the bone versus the joint. The localized, physical assessment finding of point tenderness is far more specific for diagnosis.References (research sources) - [2]Methicillin-Resistant Staphylococcus aureus Iliac Osteomyelitis with Cortical Breach Mimicking Septic Arthritis of the Hip in a Child: A Diagnostic Pitfall.Research articleKasotya D, Choudhary R, Negi R, Sharma GK, Bahagotia UK, Dwajan A. (2026) · DOI: 10.13107/jocr.2026.v16.i05.7252 - [3]Pediatric Hip Pain with Bone Lesion, Sepsis, and Occam's Razor = Brodie's Abscess Case Report.Case reportMinkowitz B, Mendelow E, Ristic J, Gagliardo C, Spingarn C. (2024) · DOI: 10.13107/jocr.2024.v14.i04.4348 ## 임상 시나리오 Clinical Assessment for Pediatric Osteomyelitis When evaluating a child with suspected osteomyelitis, a systematic physical examination is critical to differentiate it from other conditions such as septic arthritis or trauma. The hallmark finding is **exquisite point tenderness directly over the affected bone**, often accompanied by the child's refusal to bear weight or use the extremity. This localized pain results from increased intramedullary pressure and periosteal stretching due to the infectious exudate. Key Assessment Findings - **Point tenderness:** Palpate the entire length of the bone to elicit a focal area of severe pain. - **Refusal to bear weight:** The child may limp or completely refuse to stand or walk. - **Local signs of inflammation:** Warmth, erythema, and swelling may be present but are often less pronounced than in septic arthritis. - **Systemic symptoms:** Fever, malaise, and irritability are common but nonspecific. Diagnostic Pitfalls - **Pelvic or proximal femoral osteomyelitis** can mimic septic arthritis of the hip, presenting with hip pain, limp, and inability to bear weight. This overlap may lead to diagnostic delays or unnecessary joint exploration. - **Brodie's abscess** (subacute osteomyelitis) may present with vague, intermittent pain and minimal systemic symptoms, making early diagnosis challenging. **Nursing Priority:** Report any child with localized bone pain and refusal to bear weight immediately for further diagnostic workup, including blood cultures, inflammatory markers (CRP, ESR), and imaging (MRI is preferred for early detection). ## 핵심 개념 - **Osteomyelitis** — An infection of the bone, often bacterial, that causes inflammation of the medullary cavity, cortex, and periosteum, leading to localized pain and potential bone necrosis. - **Periosteum** — A dense layer of vascular connective tissue enveloping the bones except at the surfaces of joints, richly supplied with pain-sensitive nerve fibers that cause exquisite point tenderness when stretched by underlying inflammation or fluid. - **Point Tenderness** — Pain elicited by applying pressure directly over a specific anatomical structure, such as a bone, which helps differentiate bone pathology from joint or soft tissue disorders. - **Septic Arthritis** — A bacterial infection of a joint space that typically presents with joint swelling, erythema, warmth, and pain with any movement, often requiring differentiation from osteomyelitis. - **Medullary Cavity** — The central cavity of bone shafts where red or yellow bone marrow is stored; in osteomyelitis, infection and pus accumulation here increase intraosseous pressure, causing severe pain. ## 같은 주제 문제 - [A 3-year-old toddler is brought to the emergency department with suspected osteomyelitis o…](https://mymerci.kr/pages/nclex_q.php?qn_id=542394) - [A nurse is assessing a 7-year-old child suspected of having osteomyelitis. 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