Name: Pediatric limp — bulletproof documentation — ER Toolkit
Creator: Kim Trinh, MD

A limping child is an age-based differential with a few catastrophic exceptions. The defensible chart documents the weight-bearing status, an exam of the joint above and below (knee pain is often the hip), and that septic hip, SCFE, and non-accidental trauma were considered.

01What's at stake

Three misses dominate: a septic hip mistaken for transient synovitis, a slipped capital femoral epiphysis presenting as knee or thigh pain, and non-accidental trauma in a young/non-ambulatory child. Each is time- or safety-critical, and each is missed when the joint isn't examined or the limp is dismissed.

02Can't-miss differential (by age)

Septic arthritis / osteomyelitis — any age; febrile, refusing to bear weight, focal joint findings.
SCFE — older child/adolescent, often overweight; hip/thigh/knee pain with limited internal rotation; can be bilateral.
Non-accidental trauma — fracture in a non-ambulatory infant, or an injury inconsistent with the stated mechanism/development.
Malignancy (leukemia, bone tumor) — night pain, systemic symptoms, cytopenias.
Common/benign: transient (toxic) synovitis, toddler's fracture, Legg-Calvé-Perthes.

03History & exam

Fever, refusal to bear weight, focal warmth/effusion? → septic arthritis / osteomyelitis
Adolescent/overweight with hip, thigh, or knee pain and limited internal rotation? → SCFE (image the hip)
Non-ambulatory infant with injury, or mechanism that doesn't fit? → non-accidental trauma
Night pain, weight loss, bruising/pallor? → malignancy
Examine the joint above and below and document weight-bearing status — referred knee pain is the classic SCFE/hip trap.

Skip the typing

Work the case in the Pediatric Limp Workup — it records weight-bearing status, the Kocher inputs and inflammatory markers, the SCFE x-ray, and the NAI screen, and assembles an MDM that documents the can't-miss causes were addressed.

04Testing & management

Septic hip vs transient synovitis: use the Kocher predictors — non-weight-bearing, fever >38.5°C, ESR >40 (or CRP), WBC >12,000; more predictors → higher probability → ultrasound for effusion and arthrocentesis/orthopedics.
SCFE: AP and frog-leg lateral hip x-rays; non-weight-bearing and urgent orthopedics (risk to the contralateral hip).
Imaging: plain films of the symptomatic area; MRI for osteomyelitis/occult; consider a skeletal survey when NAI is suspected.
NAI: document the history carefully, involve child-protection per local protocol.
Don't discharge an undifferentiated febrile non-weight-bearing child without addressing septic arthritis.

05What to document

▼ weak

"Limping child, knee looks fine, probably a sprain. Discharged."

▲ defensible

"4-year-old limping, afebrile, bearing weight with encouragement; hip and knee examined — full painless range including internal rotation, no effusion or warmth. Kocher: weight-bearing, afebrile, normal WBC — low probability of septic hip; transient synovitis favored. NAI considered — mechanism consistent, no concerning findings. Return precautions for fever, worsening pain, or refusal to bear weight; follow-up arranged. (For SCFE concern: frog-leg lateral and orthopedics.)"

06Where charts fail

Not examining the hip in a child with knee/thigh pain (missed SCFE).
Calling a febrile non-weight-bearing child "transient synovitis" without addressing septic hip.
Not documenting weight-bearing status or the joint-above-and-below exam.
Missing non-accidental trauma in the non-ambulatory infant.
Overlooking malignancy (night pain, systemic symptoms) in the persistent limp.

07Sources

Kocher MS, Zurakowski D, Kasser JR. Differentiating septic arthritis and transient synovitis of the hip in children. J Bone Joint Surg Am. 1999;81(12):1662-1670.
Sawyer JR, Kapoor M. The limping child: a systematic approach to diagnosis. Am Fam Physician. 2009;79(3):215-224.
Perry DC, Bruce C. Evaluating the child who presents with an acute limp. BMJ. 2010;341:c4250.
Loder RT, Skopelja EN. The epidemiology and demographics of slipped capital femoral epiphysis. ISRN Orthop. 2011;2011:486512.

Pediatric limp: documentation that holds up