Normative Femoral and Tibial Lengths in a Modern Population of Twenty-First-Century U.S. Children.

BACKGROUND: The Green-Anderson (GA) leg-length data remain the gold standard for the age-based assessment of leg lengths in children despite their methodologic weaknesses. We aimed to summarize current growth trends among a cross-sectional cohort of modern U.S. children using quantile regression methods and to compare the median femoral and tibial lengths of the modern U.S. children with those of the GA cohort. METHODS: A retrospective review of scanograms and upright slot-scanning radiographs obtained in otherwise healthy children between 2008 and 2020 was completed. A search of a radiology registry revealed 3,508 unique patients between the ages of 2 and 18 years for whom a standard-of-care scanogram or slot-scanning radiograph had been made. All patients with systemic illness, genetic conditions, or generalized diseases that may affect height were excluded. Measurements from a single leg at a single time point per subject were included, and the latest available time point was used for children who had multiple scanograms made. Quantile regression analysis was used to fit the lengths of the tibia and femur and overall leg length separately for male patients and female patients. RESULTS: Seven hundred patients (328 female and 372 male) met the inclusion criteria. On average, the reported 50th percentile tibial lengths from the GA study at each time point were shorter than the lengths in this study by 2.2 cm (range, 1.4 to 3.3 cm) for boys and 2 cm (range, 1.1 to 3.1 cm) for girls. The reported 50th percentile femoral lengths from the GA study at each time point were shorter than the lengths in this study by 1.8 cm (range, 1.1 to 2.5 cm) for boys and 1.7 cm (range, 0.8 to 2.3 cm) shorter for girls. CONCLUSIONS: This study developed new growth charts for femoral and tibial lengths in a modern U.S. population of children. The new femoral and tibial lengths at nearly all time points are 1 to 3 cm longer than traditional GA data. The use of GA data for epiphysiodesis could result in underestimation of expected childhood growth. LEVEL OF EVIDENCE: Prognostic Level IV . See Instructions for Authors for a complete description of levels of evidence.

Excision of Physeal Bars of the Distal Femur, Proximal and Distal Tibia Followed to Maturity.

OBJECTIVE: In the 50 years since a premature partial physeal arrest (a physeal bar) was first excised from an epiphysis there have been no large in-depth studies reporting the results in patients followed to skeletal maturity. This paper reports the results of physeal bar resection surgery in a group of patients followed to skeletal maturity, documenting the restored growth of the affected physis, the affected bone, and the final limb-length discrepancy. METHODS: Forty-eight patients underwent physeal bar resection of the distal femur (21), proximal tibia (9), and distal tibia (18) by 1 surgeon (H.A.P.) from 1968 through 1996, and were followed prospectively to skeletal maturity with clinical and radiologic examinations. Factors such as sex, age at time of injury, etiology of the bar, physeal bar location and size, age at time of bar excision, interposition material, and additional surgical procedures were analyzed with respect to physis, bone, and limb growth following bar resection. RESULTS: The mean growth for the entire bone following physeal bar excision was 7.6 cm for the distal femur, 4.7 cm for the proximal tibia, and 7.5 cm for the distal tibia, compared with growth in the contralateral control bone of 6.8 cm in the femur, 5.0 cm in the proximal tibia, and 7.8 cm in the distal tibia. The maximum bone growth following bar excision in a single patient was 21.3 cm for the distal femur, 10.3 cm for the proximal tibia, and 18.6 cm for the distal tibia. The mean limb-length discrepancy at maturity was -1.7 cm for the distal femur, -1.3 cm for the proximal tibia, and -1.1 cm for the distal tibia (all sites combined -1.4 cm). Fourteen patients (29%) had only the 1 bar excision with no other accompanying or subsequent surgery. Thirty-four patients (71%) had 1 to 4 accompanying or subsequent leg length or angular correcting procedures. CONCLUSIONS: Physeal bar excision to restore growth when applied to the appropriate patient is a useful, rewarding procedure, reducing the number of surgical limb length equalizing procedures. It is a demanding surgical procedure and requires diligent and careful follow-up until maturity. Additional limb length equalizing surgery is frequently needed. LEVEL OF EVIDENCE: Case series, level IV.

The fate of hips that are not prophylactically pinned after unilateral slipped capital femoral epiphysis.

BACKGROUND: The indications for prophylactic pinning of the contralateral hip after unilateral slipped capital femoral epiphysis (SCFE) remain controversial in part because the natural history of the contralateral hip is unclear. QUESTIONS/PURPOSES: We therefore determined (1) the incidence of contralateral slips in patients with unilateral SCFE, (2) the rate of subsequent corrective surgery, and (3) the Harris hip score (HHS) and VAS pain score for hips that sustained a contralateral slip after unilateral pinning. METHODS: We retrospectively reviewed 226 patients with unilateral SCFE at initial presentation between 1965 and 2005; of these, 133 met our inclusion criteria and were followed at least 2 years. Latest followup included examination and radiographs for 52 patients and HHS (without radiographs) and VAS pain score for 81 hips. Minimum followup was 2 years (median, 13 years; range, 2-43 years). RESULTS: Of the 133 patients at risk for a subsequent slip, 20 patients developed a contralateral slip (15%). One patient developed avascular necrosis requiring arthroplasty, and another patient had a mild contralateral slip with disabling pain. For the 15 patients with contralateral slips and scores available, the mean HHS was 90 (range, 49-100) and the mean VAS pain score was 20 of 100. Six found the contralateral hip painful. CONCLUSIONS: The contralateral slip sustained by the majority of patients was for the most part mild. However, nearly 1/3 of the contralateral slipped hips were painful. One patient has severe pain, and a second required THA for avascular necrosis after an unstable slip. These may have been preventable by prophylactic pinning. LEVEL OF EVIDENCE: Level III, therapeutic study. See Instructions for Authors for a complete description of levels of evidence.

The ulnius: a one-bone forearm in children.

Surgical creation of a one-bone forearm is appropriately utilized for a variety of underlying conditions. It functions best when the proximal ulna and distal radius are available for use. A variety of surgical techniques have been utilized. This report reviews the pediatric literature and presents four personal cases, each with a different underlying abnormality. The rotational position of forearm fusion is discussed.