Displaced fractures of the apophysis of the olecranon in children who have osteogenesis imperfecta

Osteogenesis imperfecta with repeated simultaneous bilateral proximal tibial epiphyseal injuries caused by minor trauma: A case report and literature review

INTRODUCTION

Proximal tibial epiphyseal injuries are rare, accounting for 0.5-3 % of all epiphyseal injuries, of which bilateral cases are extremely rare. Only five cases of bilateral proximal tibial epiphyseal injuries have so far been reported in patients with osteogenesis imperfecta. We herein present a case of repeated bilateral proximal tibial epiphyseal injuries with a diagnosis of osteogenesis imperfecta. We also performed a literature review of 46 cases of bilateral proximal tibial epiphyseal injuries reported since 1955, including 5 of osteogenesis imperfecta.

PRESENTATION OF CASE

A 10-year-old boy repeatedly sustained bilateral simultaneous proximal tibial epiphyseal injuries due to minor trauma. Blue sclera was noted and, thus, genetic testing was performed and revealed osteogenesis imperfecta. After the fourth injury, we performed internal fixation with cannulated cancellous screw bilaterally. The patient had a short stature and the marked loss of bone density; therefore, the screw was kept in place until epiphyseal closure and bisphosphonate and human growth hormone were administered to prevent re-fracture and increase bone density and the growth rate.

DISCUSSION

The literature review revealed that the mean age of injury was 11.2 years for osteogenesis imperfecta cases and 14.9 years for non-osteogenesis imperfecta cases, with the former being injured at a younger age.

CONCLUSION

Osteogenesis imperfecta often causes diaphyseal fractures, which may be attributed to the fragility of the epiphyseal line. Therefore, the possibility of osteogenesis imperfecta needs to be considered when treating patients with epiphyseal injuries at rare sites, particularly younger children.

When Is an Isolated Olecranon Fracture Pathognomonic for Osteogenesis Imperfecta?

BACKGROUND

Isolated fractures of the olecranon process of the ulna in pediatric patients with open physes are classically considered pathognomonic for osteogenesis imperfecta (OI). The purpose of this study was to distinguish the clinical manifestations of isolated olecranon fractures in patients with and without OI to help practitioners assess when further evaluation for OI may be necessary.

METHODS

All patients younger than 18 years old who were treated for an isolated olecranon fracture at a pediatric tertiary care center between 2009 and 2021 were identified. Patients without radiographs available for review, those with known skeletal dysplasia other than OI, and patients with multiple fractures (eg, polytraumas) or with concomitant dislocations were excluded. Of the 701 patients identified, 403 were included for analysis. Demographic variables, mechanism of injury, treatment type, and determination of OI diagnosis were collected. Patients with a previously confirmed diagnosis of OI or with genetic confirmation of OI following their fracture were designated as OI (+), and the remainder were designated OI (-). The Mann-Whitney U and χ2 tests were used to compare groups.

RESULTS

Of the 403 patients, the median age was 7.8 years (interquartile range 5.2 to 12.5), and 270 (67%) were male. There were 14 confirmed cases of OI (3.5%). The OI (+) and OI (-) groups did not differ significantly by age or sex (P>0.05). OI (+) patients were more likely to sustain an injury from low-energy mechanisms (86% vs. 32%, P<0.001), sustain displaced fractures (86% vs. 21%, P<0.001) and undergo operative treatment (86% vs. 20%, P<0.001), and to report a history of previous fracture (79% vs. 16%, P<0.001) than OI (-) patients. 36% of OI (+) patients sustained a second olecranon fracture during the study period; there were no subsequent olecranon fractures in the OI (-) group.

CONCLUSIONS

Isolated olecranon fractures may not be pathognomonic for OI. However, orthopaedists must be vigilant about the possibility of OI in patients who sustain displaced, isolated olecranon fractures under low-energy mechanisms with a history of previous fracture(s).

LEVEL OF EVIDENCE

Level III.

Bilateral Asynchronous Displaced Olecranon Fractures in a Patient With Osteogenesis Imperfecta

Olecranon fractures are uncommon in children. Children with osteogenesis imperfecta (OI) are at an increased risk of olecranon fractures. This is a report of a 12-year-old male patient with known osteogenesis imperfecta type 1 who sustained bilateral asynchronous olecranon metaphyseal avulsion fractures. He sustained a right olecranon avulsion fracture from a fall and underwent open reduction and internal fixation with two Steinman pins and a tension band wire. He was placed in a cast for a month. The Steinman pins were removed at three months. Six months after the first fracture, he sustained a left olecranon avulsion fracture while playing soccer. He underwent open reduction and internal fixation with two Steinman pins and tension band wiring. Hardware was removed at three months. He was returned to full activity due to his type 1 OI. Bilateral asynchronous avulsion fractures of the olecranon are rare, except in children with OI. In the current case, good functional recovery was obtained with tension band wiring.

Olecranon Fractures in Pediatric Patients With Osteogenesis Imperfecta

BACKGROUND

Osteogenesis imperfecta (OI) is a hereditary disorder characterized by an abnormality of the quality or quantity of type I collagen, leading to bone fragility. Fractures in children with OI may result from minor trauma and have atypical patterns. Previous studies have found a strong relationship between olecranon fractures and OI in pediatric populations, but the characteristics of olecranon fractures within the OI patient population have not been fully described.

METHODS

We reviewed the records of 358 children with a diagnosis of OI. Of those, 29 had at least 1 olecranon fracture. We collected general information relating to the patient's diagnosis of OI including OI type, fracture history, mobility, and bisphosphonate treatment. Information regarding the fracture, treatment, and the occurrence of bilateral fractures were recorded, as well as weight, height, and axial bone mineral density z-score from the time of the fracture.

RESULTS

Within our OI population of 358 patients, we found an incidence of olecranon fracture of 8.1% (29 patients). The olecranon fractures occurred predominantly in the type I population (27 of 29). Within the population of patients specifically with OI type I (200 patients) the incidence is 13.5%, with 6% of OI type I patients sustaining bilateral olecranon fractures. The percentage of children with one olecranon fracture subsequently sustaining another on the contralateral side was 41.4%. The mean time to the second fracture was 5 months. The mean age at the time of the first olecranon fracture was 11.9 years old. The average axial bone mineral density z-score was -2.5 for primary fractures. All 12 patients who suffered a contralateral olecranon fracture had OI type I.

CONCLUSIONS

Olecranon fractures in the OI population occur most commonly in patients with type I OI and during early adolescence, a period of rapid growth. There is a high rate of bilateral olecranon fractures, with the contralateral fracture occurring quickly after the primary fracture. Further studies may elucidate risk factors to determine which patients are most likely to fracture the contralateral side and therefore drive treatment and potentially prevention.

LEVEL OF EVIDENCE

Level IV-retrospective cohort study.

Isolated olecranon fractures in children affected by osteogenesis imperfecta type I treated with single screw or tension band wiring system: Outcomes and pitfalls in relation to bone mineral density

The purpose of this study is to compare the results of 2 techniques, tension band wiring (TBW) and fixation with screws, in olecranon fractures in children affected with osteogenesis imperfecta (OI) type I. Between 2010 and 2014, 21 olecranon fractures in 18 children with OI (average age: 12 years old) were treated surgically. Ten patients were treated with the screw fixation and 11 with TBW. A total of 65% of olecranon fractures occurred as a result of a spontaneous avulsion of the olecranon during the contraction of the triceps muscle. The average follow-up was 36 months. Among the children treated with 1 screw, 5 patients needed a surgical revision with TBW due to a mobilization of the screw. In this group, the satisfactory results were 50%. In patients treated with TBW, the satisfactory results were 100% of the cases. The average Z-score, the last one recorded in the patients before the trauma, was -2.53 in patients treated with screw fixation and -2.04 in those treated with TBW. TBW represents the safest surgical treatment for patients suffering from OI type I, as it helps to prevent the rigidity of the elbow through an earlier recovery of the range of motion, and there was no loosening of the implant. In analyzing the average Z-score before any fracture, the fixation with screws has an increased risk of failure in combination with low bone mineral density.

Update on the evaluation and treatment of osteogenesis imperfecta

Osteogenesis imperfecta (OI) is a heritable bone fragility disorder that presents with a wide clinical phenotype spectrum: from perinatal lethality and severe deformities to very mild forms without fractures. Most cases of OI are due to autosomal dominant mutations of the type I collagen genes. A multidisciplinary approach with rehabilitation, orthopedic surgery, and consideration of medical therapy with bisphosphonates underpins current management. Greater understanding of the pathogenesis of OI may lead to novel, therapeutic approaches to help improve clinical symptoms of children with OI in the future.

Traumatic pediatric olecranon injury: a report of suture fixation and review of the literature

Elbow injuries make up to 3% to 4% of all emergency department presentations and are often difficult to diagnose. These injuries are often missed on radiographs because of the large cartilaginous component of the pediatric elbow resulting in malunion. Fractures around the elbow joint are one of the leading causes of litigation claim, and awareness of the pitfalls in diagnosis of these subtle injuries is necessary for a prompt diagnosis. Fracture of the olecranon epiphysis is rare and often being described around puberty and in association with osteogenesis imperfecta. Management using K-wire tension band fixation has been described in the past, which can lead to growth arrest in younger patients.We hereby present a missed rare sleeve-type open olecranon epiphyseal fracture in a young child, highlighting the pitfalls in the diagnosis of these injuries. This article also reviews various options to manage such a rare fracture and also suggests an alternative method of transosseous suture fixation with an excellent result.

Displaced olecranon apophyseal fractures in children with osteogenesis imperfecta

Three boys with mild osteogenesis imperfecta (OI) who sustained eight apophyseal avulsion fractures of the olecranon were compared with four normal boys with a unilateral apophyseal fracture. The children with OI were younger (11 years 7 months) than the normal children (14 years 3 months). All fractures were treated with tension band wiring (TBW). The contralateral elbow fractured 1 to 12 months later in the children with OI. Refractures occurred in two elbows, 6 to 16 months after the initial fracture and after TBW removal. One refracture presented late as a nonunion and was treated with bone grafting and plate fixation. None of the normal children experienced refracture after TBW removal. Good functional results and range of movement were achieved. Surgical treatment is recommended for all displaced fractures of the olecranon apophysis. There is a high risk of bilateral injury and a risk of refracture following removal of TBW in children with OI.

Osteogenesis imperfecta presenting as simultaneous bilateral tibial tubercle avulsion fractures in a child: a case report

This is a case report of a unique presentation of a mild form of osteogenesis imperfecta (OI) (type IA) in a 9-year-old African-American boy who presented with simultaneous bilateral tibial tubercle avulsion fractures. The boy presented to the authors' emergency room complaining of acute bilateral knee pain. He could not perform a straight leg raise. Other than his orthopaedic examination, significant findings included blue sclera and irregular teeth. Radiographs and magnetic resonance imaging (MRI) confirmed bilateral tibia tubercle avulsion fractures. The patient underwent open reduction and internal fixation of his fractures, and postoperative genetic testing confirmed that the patient was heterozygous for OI. The authors present the fourth reported case of simultaneous bilateral tibial tubercle fractures. To their knowledge this is the first case of OI presenting with these fractures, the youngest reported case, and the first case with MRI documentation.

Skewfoot in patients with osteogenesis imperfecta

We report skewfoot deformities in two patients who have osteogenesis imperfecta. A discussion will follow proposing etiologies of skewfoot, speculating that the ligamentous laxity often present in children who have osteogenesis imperfecta may predispose the development of skewfoot.