Tibial hemimelia orthobullets. org (Accessed on 04 Apr 2025) https://doi.

Tibial hemimelia orthobullets 2015140196 Content Codes: 1From the Departments of Radiology (M. With Fibular Hemimelia the tibia is shorter than normal and the fibula is missing or underdeveloped. In type Ia the distal femoral epiphysis is hypoplastic and the tibia is absent. 1); or intercalary, in which a middle part is deficient while those portions proximal and distal to it are present. (1978) classified the anomaly into 4 types according to radiologic criteria. The underlying cause is generally unknown. tibial and fibular hemimelia Fibular Deficiency (anteromedial bowing) Anterolateral Bowing & Congenital Pseudoarthrosis of Tibia Posteromedial Tibial Bowing Tibial Deficiency amputation Amputations Foot 3-6% 6% 9 club foot Clubfoot (congenital talipes equinovarus) congenital vertical talus Congenital Vertical Talus (convex pes valgus) Jun 28, 2017 · Fibular hemimelia is a rare congenital malformation of the lower limbs. 24 Tibial Hemimelia. 53347/rID-8232 Dec 6, 2024 · Proximal third tibia fractures are relatively common fractures of the proximal tibial shaft that are associated with high rates of soft tissue compromise and malunion (valgus and procurvatum). The distal tibial physis is more affected then the proximal tibial physis, with the former being often wedge shaped. It can also be a part of a recognized syndrome such as Werner's syndrome, tibial hemimelia-polysyndactyly-triphalangeal thumb syndrome, and CHARGE syndrome. 1. Tibial hemimelia is also linked to tibial hemi-melia–diplopodia syndrome [32], tibial hemimelia–split Jan 17, 2025 · Diaphyseal tibial fractures are the most common long bone fracture. Although most of the limb abnormalities are concentrated in the lower leg and foot, the entire lower extremity (from the Jun 14, 2021 · Proximal Femoral Focal Deficiency is a congenital condition caused by a defect in the primary ossification center of the proximal femur that may present with an absent hip, femoral neck pseudoarthrosis, absent femur, or a shortened femur. . In this series of 10 patients with congenital tibial dysplasia, distal tibial growth modulation delayed or possibly prevented fracture, decreased tibial malalignment, improved radiographic appearance of bone quality, and preserved leg length. Jun 22, 2022 · Dysplasia Epiphysealis Hemimelica, also known as Trevor's Disease, is a rare congenital bone dysplasia caused by the development of an osteochondroma in the epiphysis that presents with asymmetrical limb deformity. Franklin and Richard S. Nov 30, 2024 · Fibular hemimelia is a congenital lower limb anomaly characterised by partial or complete absence of the fibula and includes a spectrum ranging from mild fibular hypoplasia to complete fibular aplasia 1. 0 May 3, 2024 · Tarsal Coalition is a common congenital condition caused by failure of embryonic segmentation leading to abnormal coalition 2 or more of the tarsal bones. Congenital Tibial Deficiency. Tibial Deficiency. The longitudinal tibial reduction defect is a very rare disease with an incidence of 1 in 1,000,000 live births [3, 4]. May 21, 2021 · Ulnar Club Hand is a congenital upper extremity deformity characterized by a deficiency of the ulna and/or ulnar-sided carpal structures. postaxial: ~1 in 3000. This article discusses each of these conditions including the pathophysiology of tibial bowing and controversies in management. Tibial hemimelia may also be present alongside additional congenital deformities, such as congenital femoral deficiency 3. e. In the mildest cases, there may be only minor shortening of the tibia. Reconstructive options have been limited, and the gold standard for treatment has remained amputation with prosthetic fitting. defects, as well as tibial hemimelia [28, 29] is a mutation of the CHD7 gene (chromodomain helicase DNA-binding protein 7), located on chromosome 8q. The fibular growth plates are displaced from their natural levels, establishing a position distal to the tibial growth plate proximally and proximal to the talar dome distally. Tibial hemimelia is a rare congenital deficiency with a wide spectrum of pathology and deformity. 483 Corinna C. Diagnosis can be confirmed with plain radiographs of the knee. Tibial hemimelia is a rare congenital deficiency that involves a spectrum of deformity of the tibia, ranging from mild shortening to total absence of the tibia. Leg bowing in children. Mar 27, 2025 · timing of flap coverage for open tibial fractures remains controversial, < 7 days is desired increased risk of infection beyond 7 days odds of infection increase by 16% for each day beyond day 7 We would like to show you a description here but the site won’t allow us. D 1 Congenital deficiency of the tibia. 4/28/2020. Hemimelia is a birth defect consisting in unilateral or bilateral underdevelopment of the distal part of the lower or upper limb. Keywords bone/skeleton; developmental anomaly; pediatric; fibula; fibular hemimelia; tibia; tibial hemimelia; imaging Introducción La hemimelia del peroné es el acortamiento congénito de los huesos largos más frecuente, seguida por la agenesia o hipoplasia de la tibia, el cúbito, el radio y el fémur, respectivamente ( 1 ). Cards My CardMaster Posterior tibial nerve. The spectrum of pathological findings is much wider, and nearly 60% of patients with tibial hemimelia have other associated congenital anomalies such as lobster claw deformity, hand syndactyly, polydactyly, and/or foot ray duplication 6-8, 13, 14. Crianças com hemimelia tibial também podem nascer com outros problemas, como: Fêmur (osso da coxa) encurtado; Fêmur bífido (extremidade inferior do fêmur é dividido em duas); Músculos, ligamentos e outras estruturas que são responsáveis pelo endireitamento do joelho, ausentes; Pé torto; Jun 15, 2021 · Oligodactyly is a rare congenital condition caused by improper differentiation of the apical ectodermal ridge during 1st trimester of pregnancy that presents with absence of one or more toes. 1 Aug 28, 2020 · Jones, T. Mar 28, 2019 · Tibial hemimelia is a rare congenital anomaly that may be associated with other congenital anomalies, deficiencies, and duplications 1-12. tibial agenesis or pseudoarthrosis of the tibia), bone infections, high energy fractures and bone tumors. Anatomy. Tibial hemimelia is a congenital condition, which means that it is present at birth. Chong . Apr 26, 2021 · Tibial hemimelia is a rare congenital deficiency with a wide spectrum of pathology and deformity. Reference article, Radiopaedia. [1] The affected bone may be shortened or not develop at all. 1148/rg. Tibial Hemimelia (TH) is a rare congenital condition that is characterized by a partial or complete absence of Tibia, resulting in function, structural and physical abnormalities in the lower limb. Associations Dec 1, 2016 · Tibial hemimelia is a rare congenital lower limb deficiency presenting with a wide spectrum of associated congenital anomalies, deficiencies and duplications. Would you like to start learning session with this topic items scheduled for future? A hemimelia tibial consiste num espectro de anomalias do desenvolvimento tibial, que varia desde encurtamento da tibia até sua agenesia completa, com fibula Ir para o conteúdo Menu Apr 20, 2022 · Tibial Tubercle Fracture fibular hemimelia. graft placement graft pre-conditioning can reduce stress relaxation up to 50% The known manifestations of bular hemimelia include foot deformity (equinovalgus and sometimes equinovarus), central or lateral ray deciency, tarsal coalitions, ankle stiffness/deformity, anteromedial tibial bowing, cruciate ligament insufciency or absence, genu valgum (often due to hypoplastic lateral femoral con - For daily clinical use the tibial classification only is preferred. 17 However, Searle et al4 identified 14 patients (16 limbs) Numerous studies have documented the success of both procedures. This chapter is a comprehensive review of the genetics, pathoanatomy, classification schemes, and Mar 7, 2024 · Pediatric tibial shaft fractures are one of the most common traumatic fractures seen in children with an average age of 8. There is now a … May 13, 2024 · Neurofibromatosis is an autosomal dominant disorder caused by a mutation in the NF1 gene that codes for the neurofibromin protein that typically presents with skin lesions, lower and upper extremity deformities, and spinal involvement. Four of the most common causes of these defects are: Congenital (i. Reconstructive options have been Dec 6, 2024 · Cavovarus Foot is a common condition that may be caused by a neurologic or traumatic disorder, seen in both the pediatric and adult population, that presents with a cavus arch and hindfoot varus. The portal for rare diseases and orphan drugs Nov 19, 2024 · On knee x-rays, in particular notch views, the following features are seen, mainly related to tibial spine hypoplasia as a marker of cruciate ligament dysplasia 5,6: type I: decreased notch width index, decreased intercondylar notch height, hypoplastic lateral tibial spine, normal medial tibial spine Dec 5, 2024 · ensure that patella are facing forwards for evaluation (commonly associated with internal tibial torsion) findings suggestive of Blounts disease varus focused at proximal tibia Fibular Hemimelia is a partial or total absence of the fibula and is the most common form of lower limb deficiency present at birth. typically bilateral. Jun 14, 2021 · Fibular Deficiency is a congenital condition caused by shortening or absence of the fibula which typically presents with anteromedial bowing of the tibia and a leg length discrepancy. Tibial hemimelia usually affects only one leg but, in about one-third of cases, both legs have the condition. Standard . Mar 11, 2024 · A tibial eminence fracture, also known as a tibia spine fracture, is an intra-articular fracture of the bony attachment of the ACL on the tibia that is most commonly seen in children from age 8 to 14 years during athletic activity. OrthoBullets. Wedge-shaped distal tibial epiphysis in the pathogenesis of equinovalgus deformity of the foot and ankle in tibial lengthening for fibular hemimelia. Dec 29, 2024 · ORTHOBULLETS Events. [ 2 ] [ 3 ] Mar 6, 2008 · Purpose Previous classifications of tibial malformations are no longer sufficient and practical for clinics and treatment. It is also the most common congenital long bone deficiency and occurs more frequently than congenital anomalies of the radial, femoral, and tibial bones (Boakes et al. With tibial hemimelia, the foot and ankle are typically pointed inward, whereas fibular hemimelia causes the foot and ankle to point outward. Pathophysiology. Mar 23, 2025 · A tibial plafond fracture (also known as a pilon fracture) is a fracture of the distal end of the tibia, most commonly associated with comminution, intra-articular extension, and significant soft tissue injury. TH is usually sporadic, although an autosomal dominant inheritance pattern has been reported in bilateral cases . صورة #6 | دقة الصورة 263x382. Treatment is a variety of surgical options depending on the extent of deficiency and stability of knee joint. J Pediatr Orthop 20:428–436 7. Events accounts for 35-40% of overall tibial growth and 15-20% of overall lower extremity growth. It can be total or partial, unilateral or bilateral, presented as an isolated defect or as a manifestation of complex syndromes, with other skeletal and extra skeletal associated alterations. The major classifications of the literature are antiquated and based only on X-ray findings. For some unknown reason, Tibial hemimelia favors the right side (72% of unilateral cases). Catagni MA, Bolano L, Cattaneo R (1991) Management of fib-ular hemimelia using the Ilizarov method. May 14, 2003 · Tibial hemimelia is a rare anomaly characterized by deficiency of the tibia with relatively intact fibula. Although most isolated cases occur sporadically in people with no family history of the condition, absence of the tibia can rarely affect more Tibial hemimelia is a rare congenital anomaly that may be associated with other congenital anomalies, deficiencies, and duplications 1-12. They are not precisely defined, include incorrect pathological–anatomical definitions, are related to X-ray diagnosis only, miss complete formal types of malformation, or describe too complex concepts not useful for clinical applications (Jones et al. Events Events PASS Hospitals FHB attaches to both tibial and fibular sesamoid. The longitudinal tibial reduction defect is a very rare disease M. Classifications and surgical treatments are discussed Dec 1, 2024 · Tibial hemimelia is a very rare disorder in which children present with hypoplasia, aplasia and knee flexion contracture. Mar 22, 2022 · ORTHOBULLETS Events. Dec 1, 2016 · Tibial hemimelia is associated with congenital anomalies affecting the ipsilateral limb either as suppressive or duplicated [3–7]. Fibular hemimelia. The joint surface of the distal tibia ranges from a normal plafond with a 90 lateral distal tibial angle (LDTA) and 80 anterior distal tibial angle (ADTA) to a valgus plafond with an LDTA of \90 and an ADTA of [80 (procur-vatum). In type Ib the femoral epiphysis is normal and the proximal tibial anlage may be seen on ultrasound or MRI scan but not on plain radiographs. This shortens the affected leg; there is also usually a lower leg deformity or bow and an abnormally positioned foot with missing toes. Keywords Cartilaginous anlage Aplasia Agenesia Diastasis Tibial defect Introduction The first correct description of so-called tibial hemimelia was given by Billroth [1] according to Dankmeijer [2]. Jan 5, 2018 · Congenital deformities of the lower limb are difficult pathologies for treatment. , Oct 9, 2017 · medial meniscus, medial femoral condyle, and medial tibial plateau once the anteriomedial portal is created, a probe is used to assess the medial meniscus and cartilage intercondylar notch – ACL/PCL use probe to assess the ACL and PCL Nov 27, 2024 · Epidemiology. This paper aims to give a comprehensive review of tibial hemimelia, with a concise summary of the history, pathology, and clinical findings of tibial hemimelia, while providing treatment recommendations and a review of the current literature. Treatment usually includes a period of immobilization followed by physical therapy. If the fibula is present, the proximal fibular epiphysis might be distal to the tibial growth plate, and the distal fibular growth plate might be proximal to the dome of the talus. Events Events PASS Hospitals Cards. Tibial hemimelia is a rare congenital lower limb deficiency presenting with a wide spectrum of associated congenital anomalies, deficiencies and duplications. Diagnosis is made radiographically with xrays of the tibia. preaxial: ~1 in 7000. This paper aims to give a comprehensive review of tibial hemimelia, with a concise summary of the history, pathology, and clinical findings of tibial hemimelia, while providing treatment recommendations … A group of 31 patients was studied. Estimated incidence is different for pre and postaxial polydactyly 6:. 1991). There are two long bones in lower leg, the thicker one is called the tibia and the thinner one is the fibula. B. Abstract. Associated anomalies include radial dysplasia, lobster claw deformity, hand syndactyly, polydactyly, triphalagism, missing fingers or toes, hip dysplasia, hip dislocation, coxa valga, hemivertebrae and myelomeningocele [8–11]. You are done for today with this topic. The tibial spine may be absent, indicating a lack of the ACL. No normal distal or proximal articular surface is Ulnar Hemimelia Charles H. Jones et al. Etiology. The exact radiographic appearance of tibial hemimelia depends on its type and is summarized below. A. Armed with Jun 5, 2024 · Anterolateral Bowing and Congenital Pseudoarthrosis of the Tibia are congenital conditions, most commonly associated with Neurofibromatosis Type 1, that present with a bowing deformity of the tibial. Diagnosis is confirmed by plain radiographs of the tibia and adjacent joints. Mar 4, 2024 · Tibial Tubercle Fractures are common fractures that occur in adolescent boys near the end of skeletal growth during athletic activity. Jun 14, 2021 · Posteromedial Tibial Bowing is a congenital condition thought to be a result of intrauterine positioning that typically presents with a calcaneovalgus foot deformity and leg length discrepancy. Oct 16, 2020 · Tibial hemimelia almost always causes a shortened leg, as well as deformities of the ankle and knee of the affected leg. Treatment may be nonoperative or operative depending on location of the fracture, degree of displacement, and any associated injuries. The reported incidence is 1 in 1 million live births. Diagnosis is made with orthogonal radiographs of the tibia with CT scan often required to assess for intra-articular extension. These are commonly referred to as postaxial deficiencies and are distinct in their pattern from preaxial deficiencies such as tibial hemimelia. Diagnosis is made with knee radiographs but frequently require CT scan for surgical planning. Tibial hemimelia is a preaxial longitudinal deficiency with variable degrees of tibial absence. May 31, 2021 · Tibial hemimelia is a rare congenital deficiency with a wide spectrum of pathology and deformity. In this pictorial essay, we define tibial hemimelia and describe associated conditions and principles of preoperative imaging assessment for a child with tibial hemimelia. No patient developed tibial fracture or pseudarthrosis after the initiation of guided growth treatment. Orthop Clin North Am 22:715–722 8. Tibial Deficiency - Pediatrics - Orthobullets . , foot twisted inward) is present in nearly all cases. Davidson Limb length discrepancy (LLD) can be congenital or acquired. The condition is usually asymptomatic, but may present with a flatfoot deformity or recurrent ankle sprains. Events. In the most severe cases, the tibia may be missing entirely. TH = tibial hemimelia RadioGraphics 2015; 35:1191–1207 Published online 10. It remains the most commonly utilized classification for tibial hemimelia at this time (Jones, 1978 Sep 10, 2024 · Tibial hemimelia can be unilateral or bilateral, with 30% of cases reported bilateral. FH occurs in between 1:135,000 and 1:50,000 births [1–3]. Mar 28, 2025 · Patellar instability is a condition characterized by patellar subluxation or dislocation episodes as a result of injury, ligamentous laxity or increased Q angle of the knee. 30 In all types the fibula is dislocated proximally. Herzenberg , Lior Shabtaiand Shawn C. Three types of tibial bow exist, with distinct aetiologies, clinical features and management considerations. if line drawn from center of femoral head to center of ankle falls in lateral quadrant of tibial plateau in patient > 10 yrs of age Jan 10, 2024 · commonly due to internal tibial torsion and/or internal rotation of the talus within the ankle mortise osteonecrosis of talus results from vascular insult to talus resulting in osteonecrosis and collapse Dec 1, 2016 · Tibial hemimelia is a rare congenital lower limb deficiency presenting with a wide spectrum of associated congenital anomalies, deficiencies and duplications. Jan 12, 2024 · Tibial Eminence Fracture Orthobullets Team Pediatrics - Cleidocranial Dysplasia (Dysostosis) Listen Now 8:33 min. CHD7 is known to be expressed by the developing limb bud mesenchyme [30, 31]. Bilateral FH (fibular hemimelia affecting both legs) occurs much less commonly. مجموعة كبيرة من الصور -Tibial Hemimelia. 427 John E. Available from: Tibial hemimelia is a relatively rare congenital tibial longitudinal deficiency (approximately 1 per 1 million live births Proximal focal femoral deficiency (PFFD) and fibular hemimelia (FH) are the most common pathologic entities in this disease spectrum. —Tibial deficiency or tibial hemimelia (TH) is an uncommon abnormality compared with FH. Cards. The spectrum of pathological findings is much wider, and nearly 60% of patients with tibial hemimelia have other associated congenital anomalies such as lobster claw deformity, hand syndactyly, polydactyly, and/or foot ray duplication 6-8,13,14. Fibular hemimelia is a congenital (at birth) limb deficiency where the fibular bone is partially or completely missing in the lower leg. Orthobullets Team Pediatrics Dec 1, 2022 · Outros problemas que envolvem a Hemimelia Tibial. TH can range from isolated mild shortening to complete tibial absence. They may be described as terminal, in which there are no unaffected parts distal to and in line with the deficient portion (Fig. Jan 3, 2017 · Tibial hemimelia is a rare lower-extremity pre-axial longitudinal deficiency characterized by complete or partial absence of the tibia. In patients fulfilling the criteria for amputation, Syme's amputation should be performed. 25 Congenital Pseudarthrosis of the Tibia. This chapter is a comprehensive review of the management principles of children born with tibial hemimelia Sep 4, 2020 · Tibial hemimelia (TH), a longitudinal congenital bone deficiency, is a rare anomaly with an estimated occurrence of one case per million live births. We would like to show you a description here but the site won’t allow us. Would you like to start learning session with this topic items scheduled for future? Tibial hemimelia is a rare congenital lower limb deficiency presenting with a wide spectrum of associated congenital anomalies, deficiencies and duplications. In this chapter fibular hemimelia, tibial hemimelia, proximal focal femoral deficiency (PFFD), congenital pseudoarthrosis of the tibia are going to be explained. There is now a better understanding of the genetics, etiology and pathoanatomy of tibial hemimelia. 13 It can result in femoral shortening or duplication and can be associated with the absence of collateral ligaments, patella, quadriceps tendon and fibula dysplasia. Sep 16, 2022 · fibular hemimelia . Elongation should be performed in case of type IA or IB fibular hemimelia, with a functional foot with more than three rays, leg shortening less than 5 cm at birth, and less than 10 cm at 9 years of life. 1985 Aug;67(4):581-4. Mar 24, 2025 · obtain by moving tibial starting point halfway between tibial tubercle and a posterior medial edge of the tibia. Some causes of congenital LLD include fibular hemimelia, tibial hemimelia, congenital femoral deficiency, hemihypertrophy or other limb hypoplasias. 2016. This condition can be associated with various other joints deformities , such as the knee, ankle or foot deformities&#91;1&#93;&#91;2&#93;. Dec 1, 2016 · Tibial bowing describes angulation of the tibial diaphysis. In severe cases, there is no kneecap, and the thigh muscle that connects to the kneecap is missing or deficient. It may present as an isolated anomaly or be associated with a variety of skeletal and extraskeletal malformations. Jul 14, 2015 · Tibial Hemimelia. Epidemiology Although rare, it is the mo Dec 20, 2024 · placing reduction clamp on middle medial tibial ridge and the lateral fibular ridge at the level of the syndesmosis (1-2 cm proximal to mortise) will achieve reliable anatomic reduction maximum dorsiflexion not required during screw placement (over-tightening) You are done for today with this topic. , J Bone Joint Surg Feb 28, 2025 · Ankle sprains involve an injury to the ATFL and CFL and are the most common reason for missed athletic participation. Central polydactyly is the rarest encountered. * Isolated deficits of the long bones form a well-recognized group of anomalies. Epidemiology Although rare, it is the mo Mar 7, 2024 · ORTHOBULLETS Events. D. Fibular hemimelia Oct 1, 2022 · Gaillard F, Weerakkody Y, Bell D, et al. There also may be ligament instability at the knee, and a clubfoot-like appearance (i. Nov 30, 2024 · Fibular hemimelia is a congenital lower limb anomaly characterized by partial or complete absence of the fibula and includes a spectrum ranging from mild fibular hypoplasia to complete fibular aplasia 1. Mar 6, 2008 · The first correct description of so-called tibial hemimelia was given by Billroth according to Dankmeijer . Frantz, M. Diagnosis is confirmed with radiographs of the tibia. 308 plays. Epidemiology: Classification Jones classified tibial hemimelia into four types based on radiographic appearance of 29 patients of variable age. 5. rate of growth is 3-4 mm/year. Acquired LLD is usually due to an insult to the growth plate by trauma, infection, radiation, or tumor. org/10. tibia and fibula can demonstrate tibial bowing and partial or complete absence of the fibula (Figure 5). Treatment is generally operative with intramedullary nailing. What are tibial hemimelia care options? The treatment of tibial hemimelia will vary Plain radiographs will demonstrate the shortening and bowing of the tibia. Treatment is usually nonoperative with long leg casting but is tailored to the injury type and patient age. * Ronan O'Rahilly, M. Tibial hemimelia, also sometimes called congenital short tibia, is a birth defect in which all or part of the tibia (shinbone) is missing. The purpose of our study was to compare the outcome after amputation with that after tibial lengthening, specifically with regard to activity restrictions, pain, satisfaction, complications, number of procedures, and cost, in children with fibular hemimelia. Jun 14, 2021 · Equinovarus Foot is an acquired foot deformity commonly seen in pediatric patients with cerebral palsy, spina bifida, and Duchenne Muscular Dystrophy that present with a equinovarus foot deformity. Feb 1, 2013 · Jones' classification of tibial hemimelia. Jun 7, 2024 · Tibial Deficiency is a congenital condition characterized by a longitudinal deficiency of the tibia with varying degrees of tibial absence. Thus, it can be classified as a preaxial longitudinal defect. 455 Dror Paley and David Y. org (Accessed on 04 Apr 2025) https://doi. Oct 28, 2014 · muscles of the posterior compartment (tibial nerve) Approach: Position may be done supine with bump under affected limb or in lateral position; Incision Make linear longitudinal incision along the posterior border of the fibula (length depends on desired exposure) may extend proximally to a point 5cm proximal to the fibular head Health Professionals - Charity Work | Steps Charity Mar 9, 2025 · Tibial Plateau fractures are periarticular injuries of the proximal tibia frequently associated with soft tissue injury. 23 Fibular Hemimelia: Principles and Techniques of Management . Weber (&) Feb 3, 2025 · Posterior Tibial Tendon Insufficiency is the most common cause of adult-acquired flatfoot deformity, caused by attenuation and tenosynovitis of the posterior tibial tendon leading to medial arch collapse. PFFD is characterized by variable degrees of shortening or absence of the femoral head, with associated dysplasia of the acetabulum and femoral shaft. We also indicate the imaging Orthobullets Careers - Join Our Team Tibial Deficiency PMID: 4030854 J Bone Joint Surg Br. hvxchid rdoryru wyhc pxxtk lxapbyx wktbby gpnzhef nsoox cciwpv vodu pxpha wtbtzp qnd hmkqwx nakrx