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Background: Anterior Cruciate Ligament Aplasia (ACLA) is a rare condition which can sometimes remain asymptomatic into adult life. Although the quoted incidence is 1.7 per 100,000 live births, it is higher due to these silent cases and can be encountered by the arthroscopy surgeon doing reconstructive procedure for the ACL. The aim of this study is to get information on clinical presentation, imaging, arthroscopy findings and management of the knee in patients with ACL aplasia through a systematic review relevant to the arthroscopy surgeon in making a decision when they encounter such a case. Methods: We performed a systematic review of the literature to get information on this condition that may be relevant to the arthroscopy surgeon from PubMed, Ovid full text, Embase and Ovid Medline databases. After exclusions and inclusions, we found 31 articles relevant to the search which included 101 knees. Results: Most of the publications were case reports due to the rarity of this condition. ACLA is commonly associated with Fibular Hemimelia, Congenital Dislocation of the Knee and Proximal Focal Femoral Deficiency (PFFD). Clinical findings, imaging appearances, other associated findings with ACLA have been listed and management options listed and discussed. Conclusions: Patients with ACLA are often asymptomatic and arthroscopic reconstruction of the ACL appears to be a viable option in selected symptomatic cases only. The arthroscopic surgeon should be aware of the clinical picture and intraarticular findings of ACLA to recognize the condition and make a decision on the optimal management. Further studies are required to report on long-term outcomes of the condition in terms of secondary osteoarthritis development as well as the procedures performed. We recommend forming a global registry to study and further understand the aspects of this condition. Level of Evidence: 4 [ABSTRACT FROM AUTHOR]

Congenital posterior dislocation of fibula with pes valgus deformity is a rare disorder in children and has not been reported in English literature. The parents recognize it when the child starts to bears weight as the foot appears normal non-weight bearing but on standing or bearing weight it goes into valgus. As the foot is manually correctable to neutral plaster correction does not suffice and surgery becomes essential. The differential diagnosis of this condition is the well-described congenital diastasis of inferior tibiofibular joint, where the foot is with equinovarus deformity. We are reporting a child of 2 years of age who presented to us walking on the medial border of sole, a valgus deformity on walking and no other congenital anomalies. We operated upon this case of congenital posterior dislocation of fibula with pes valgus deformity and are reporting it for the abnormal patho-anatomy, surgical steps followed and treatment protocol adopted by us. [ABSTRACT FROM AUTHOR]

Background: Fibular hemimelia is the most common congenital long-bone deficiency. It is usually unilateral and results in a limb-length discrepancy. The literature generally subscribes to the concept of constant inhibition, a process by which limb-length ratios between the shorter and longer extremity remain constant throughout growth, but scientific data supporting this concept are sparse. Additionally, recent literature suggests that these children have abnormal skeletal maturation.Objective: To elucidate the lower-extremity long-bone growth patterns and skeletal maturation of children with unilateral fibular hemimelia.Materials and Methods: We reviewed medical records of children with unilateral fibular hemimelia seen at a large pediatric hospital over a 17-year period. Inclusion criteria were: at least two scanograms prior to any shortening/lengthening procedure, and no other congenital or acquired disorders. We collected the study cohort's femoral and tibial lengths (scanogram reports), plotted them against patient chronological ages and compared them to published growth standards. When these children's bone ages (Greulich and Pyle) were available, we plotted them against the children's chronological ages.Results: Twenty-three children were included (total=115 scanograms). At least 1 bone-age assessment was performed in 19 children (total=84 bone ages). All bone growth curves were within normal growth standards for the femur and tibia. Length ratios between shorter and longer limbs remained constant. Skeletal maturation was within two standard deviations of normal in 90% of bone ages.Conclusion: Lower-extremity long bones of children with unilateral fibular hemimelia have relatively normal growth curves, supporting and confirming the concept of constant inhibition. Most children show normal skeletal maturation. [ABSTRACT FROM AUTHOR]

Background: The classic metaphyseal lesion (CML) is strongly associated with infant abuse, but the biomechanics responsible for this injury have not been rigorously studied. Radiologic and CT-pathological correlates show that the distal tibial CML always involves the cortex near the subperiosteal bone collar, with variable extension of the fracture into the medullary cavity. Therefore, it is reasonable to assume that the primary site of bone failure is cortical, rather than intramedullary.Objective: This study focuses on the strain patterns generated from finite element modeling to identify loading scenarios and regions of the cortex that are susceptible to bone failure.Materials and Methods: A geometric model was constructed from a normal 3-month-old infant's distal tibia and fibula. The model's boundary conditions were set to mimic forceful manipulation of the ankle with eight load modalities (tension, compression, internal rotation, external rotation, dorsiflexion, plantar flexion, valgus bending and varus bending).Results: For all modalities except internal and external rotation, simulations showed increased cortical strains near the subperiosteal bone collar. Tension generated the largest magnitude of cortical strain (24%) that was uniformly distributed near the subperiosteal bone collar. Compression generated the same distribution of strain but to a lesser magnitude overall (15%). Dorsiflexion and plantar flexion generated high (22%) and moderate (14%) localized cortical strains, respectively, near the subperiosteal bone collar. Lower cortical strains resulted from valgus bending, varus bending, internal rotation and external rotation (8-10%). The highest valgus and varus bending cortical strains occurred medially.Conclusion: These simulations suggest that the likelihood of the initial cortical bone failure of the CML is higher along the margin of the subperiosteal bone collar when the ankle is under tension, compression, valgus bending, varus bending, dorsiflexion and plantar flexion, but not under internal and external rotation. Focal cortical strains along the medial margins of the subperiosteal bone collar with varus and valgus bending may explain the known tendency for focal distal tibial CMLs to occur medially. Further research is needed to determine the threshold of applied forces required to produce this strong indicator of infant abuse. [ABSTRACT FROM AUTHOR]

Fibular hemimelia presents with foot deformity and leg length discrepancy. Previous classifications have focused on the degree of fibular deficiency rather than the type of foot deformity. Published methods of surgical reconstruction have often failed due to residual or recurrent foot deformity. The purpose of this report is to introduce new classification and reconstruction methods. The Paley SHORDT procedure is used to stabilize the ankle when there is a hypoplastic distal fibulawith a dynamic valgus deformity. It involves shortening and realignment of the distal tibia relative to the fibula. In contrast, the Paley SUPERankle procedure is used when there is a fixed equinovalgus foot deformity. The SUPERankle uses a supramalleolar shortening-realignment osteotomy and/or subtalar osteotomies with anlage resection. Due to the bony instead of soft tissue correction of deformity, residual or recurrent deformity is prevented. Weakening of gastro-soleus and peroneal muscles is avoided by shortening of the tibia instead of tendon lengthening. The limitation of ankle motion is related to ankle dysplasia rather than surgery or lengthening. A plantigrade-stable foot and ankle leads to an excellent functional result comparable or better than a Syme's amputation with prosthetic fitting. Serial lengthening procedures combined with the SHORDT or SUPERankle reconstruction lead to limb length equalization with a plantigrade, painless, functional foot. [ABSTRACT FROM AUTHOR]

The article offers information on the case of a one-year-old boy who was diagnosed with isolated congenital pseudarthrosis of the fibula and fibrous dysplasia, wherein a pseudarthrosis at the distal fibula was showed using plain radiographs.