Os trigonum Radiology

Trigonum im Angebot - Gratis Versand in 24h ab 20

This is consistent with an os trigonum, a common accessory bone found just posterior to the lateral tubercle of the posterior talar process. In this case, the os trigonum, appears to be partially fused with the lateral tubercle. 2 article feature images from this case 7 public playlist include this cas The os trigonum syndrome refers to symptoms produced by pathology of the lateral tubercle of the posterior talar process. Pain can be caused by disruption of the cartilaginous synchondrosis between the os trigonum and the lateral talar tubercle as a result of repetitive microtrauma and chronic inflammation An os trigonum should be differentiated from a fractured lateral-talar tubercle on a radiograph. An os trigonum is usually round or oval, with well-defined corticated margins, while a fractured lateral tubercle has irregular serrated margins between the ossicle and the posterior talus. However, a fractured fragment may also have smooth borders. The os trigonum fracture related to the first case was sustained following a hyper-plantar flexion injury during a game of soccer. The second case involved a patient who fell from height and also sustained open fractures of the left distal tibia and lateral malleolus as well as the right calcaneus Os trigonum syndrome is a stress injury of the synchondrosis that is most commonly associated with acute or chronic repetitive hyperplantarflexion and has been frequently described in ballet dancers [ 32 - 35] and soccer players [ 36 ]

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  1. ent unfused apophysis of the lateral tubercle of the talus. The os trigonum is present in the normal population in about 5-15%. Compression of the os trigonum and surrounding soft tissues between the tibia and the calcaneus during plantar flexion can be a cause of posterior impingement
  2. Another CSI - this one for an os trigonum - those occasional pesky little blighters at the back of the talus. Note the MRI included.Done under x-ray guidanc..
  3. Os trigonum syndrome is a rare and painful condition that can affect people who have an os trigonum bone. The os trigonum is an accessory (extra) bone that's present in about 15 to 30% of people in at least one foot. 1 It is a small, round bone that sits just behind the ankle joint. This accessory bone doesn't usually cause symptoms, but it can

Home Musculoskeletal radiology os trigonum Os Trigonum. Os Trigonum Tuesday, November 02, 2010 Musculoskeletal radiology, os trigonum. Between 8 and 13 years of age, an ossification center forms posterior to the talus. Normally, this ossification center fuses with the talus.. The os trigonum syndrome constitutes a subtype of posterior ankle impingement syndrome [ 2, 5 ]. Radiographs can detect the presence of an os trigonum; however, their sensitivity is limited in the assessment of early bone changes occurring with the development of pathology Os Trigonum. Os (bone) trigonum is an anatomic variant in which extra bone is located behind the ankle bone. This bone can become inflamed and rub against some tendons and even cause tendon tears. Accessory bone found just posterior to talus which is usually asymptomatic. Present in 2-14% of normal feet Purpose: The aim of the study was to examine the ligaments of the os trigonum. Methods: The ankle joint magnetic resonance imaging (MRI) of 104 patients with the os trigonum (experimental group) and 104 patients without the os trigonum (control group) were re-reviewed. The connections of the os trigonum and posterior talofibular ligament (PTFL), the fibulotalocalcaneal ligament (FTCL), the.

Os trigonum Radiology Reference Article Radiopaedia

  1. In all patients, MR imaging demonstrated abnormal bone marrow signal intensity in the os trigonum and/or lateral talar tubercle, consistent with bone contusions. Two patients had a fragmented os trigonum or lateral tubercle, and two had a pseudoarthrosis of the posterolateral talus
  2. Os trigonum is one of the bony ossicles of the foot and can be mistaken for a fracture. It sits posterior to the talus on the lateral foot radiograph and represents failure of fusion of the lateral tubercle
  3. The os trigonum is an accessory (extra) bone that sits in the back of the ankle near the heel bone. This occurs in 2.5-14% of normal feet. It is usually round, oval, or triangular, and varies in size. During growth, it may eventually fuse with the ankle bone (talus), or remain as a separate small bone connected to the talus by a fibrous band
  4. The Os trigonum syndrome : A diagnosis not to be missed. Soukaina Allioui* Department of Department of radiology. Ibn Sina Hospital. Mohammed V University. Rabat. Morrocco. Abstract The os trigonum is a triangular separate ossicle located at the posterior aspect of the talus close to the lateral tubercle
  5. ed, x-rays or other imaging tests are often ordered to assist in making the diagnosis..
  6. Background: Symptomatic os trigonum is a rare condition well described in adults responsible for chronic ankle pain. To date there is no published case of successfully managed symptomatic os trigonum in children. Methods: We retrospectively reviewed 4 paediatric patients (11-17) successfully operated on for a symptomatic os trigonum through a postero medial approach
  7. i. Diagnosis certain Diagnosis certain . Presentation. The patient had presented with a sprained ankle, and a tibiotalar joint effusion is evident anteriorly. From the case: Os trigonum. X-ray. Lateral.

Os trigonum is an accessory bone observed in 7-13% of society and in some cases can be fragmented or bipartite [1, 2]. It appears between the ages of 8 and 11 years as a secondary centre of ossification and usually fuses with the talus within one year of its appearence [3, 4] Posterior ankle impingement (PAI) syndrome is one of the impingement syndromes involving the ankle. It is classically described in ballet dancers. Epidemiology It is usually a unilateral phenomenon. Bilateral posterior ankle impingement syndrom.. The Os Trigonum Syndrome refers to pain posterior of the ankle and reduced plantarflexion caused by the nutcracker-phenomenon. When an os trigonum is present, this accessory ossicle together with surrounding soft tissues can become wedged between the tibia, talus and calcaneus. This can lead to inflammation of the involved structures

Os trigonum impingement occurs when repetitive PF compression irritates local soft tissue launching a chronic inflammatory response (Hess 2011).Scar tissue hypertrophy, joint capsule thickening and excessive inversion or eversion on end-range PF can further compress the os trigonum (Niek van Dijk 2006).Giannini (2013) also describes an avulsion of the os trigonum on forced dorsiflexion, then. Os trigonum syndrome. Mendez-Castillo A(1), Burd TA, Kenter K, Griffiths HJ. Author information: (1)Department of Radiology, University of Missouri Hospital and Clinics, Columbia 65212, USA The diagnosis of PAI or os trigonum syndome is based primarily on the patient's clinical history and physical examination and is supported by findings at radiography, computed tomography (CT), scintigraphy, and MR imaging. Typically the patient presents with posterior ankle pain exacerbated by plantar flexion of the foot

(κ = 0.77), and 57% of the os trigonum was between 0.5 and 1.5 cm. In the ankles without an os trigonum, an enlarged lateral tubercle of the posterior talar process was found in 34.9 and 36.5% of the ankles (κ = 0.60) (Table 4). Ethnicity, age, and presence of posterior ankle com-plaints were associated with the presence of an os trigonum Author information: (1)Department of Radiology, University of California Davis Medical Center, Sacramento, CA 95817, USA. emescobedo@ucdavis.edu A 21-year-old man presented with ankle pain after a motor vehicle accident. Imaging revealed an acute fracture of the os trigonum in addition to multiple, other lower-extremity fractures

The os trigonum is the unfused lateral tubercle of the posterior talus, found in approximately 14-25% of the healthy population . The flexor hallucis longus tendon may be compressed by the os trigonum, which is on the lateral side of the fibroosseous tunnel CT facilitates accurate assessment of osseous changes between the os trigonum and talus, such as fragmentation of the os and pressure-related erosions along the talus . Conventional MRI can accurately detect abnormalities at the synchondrosis including opposing marrow edema or fluid signal at the synchondrosis related to motion [ 49 , 50 , 59.

Os trigonum syndrome Radiology Case Radiopaedia

  1. os trigonum can be round, oval or triangular and of variable size. MRI. findings. shows os trigonum and associated inflammation and edema in FHL tendon. Differential diagnosis. fracture of the posterior process of the talus (Shepherd's fracture) FHL and posterior tibialis tendinitis
  2. Dislocation of the os trigonum presenting as a loose body is a rare clinical entity. In this report, we describe the case of a 34-year-old male who presented with symptoms of acute left ankle pain that was aggravated by motion and weight bearing. He also displayed lateral collateral ligamentous laxity, without the presence of an effusion
  3. Os trigonum. (a) Lateral radiograph of the ankle shows an ovoid bony structure (arrow) posterior to the talus (asterisk). The structure is well corticated, likely representing an os trigonum rather than a fracture. (b) Sagittal T1-weighted MR image shows an os trigonum (arrow) with a synchondrosis between the ossicle and talus
  4. Os trigonum may be responsible for chronic ankle pain in children, adolescents, and adults. The most common pathology of the talus and os trigonum is subchondral edema along the synchondrosis . Oestreich reported that a large os trigonum may be associated with flexor hallucis longus tenosynovitis or entrapment . He reported a mega os trigonum.
  5. The case presented in this article is one such example, where the patient presented with chronic unilateral ankle pain and initial radiographs revealed bilateral os trigonum and os subtibiale. He underwent a technetium-99m methyl diphosphonate (Tc-99m MDP) bone scan and single photon emission computed tomography/computed tomography (SPECT/CT)

Os trigonum syndrome is the result of an overuse injury of the posterior ankle caused by repetitive plantar flexion stress. It is predominantly seen in ballet dancers and soccer players and is primarily a clinical diagnosis of exacerbated posterior ankle pain while dancing on pointe or demi-pointe or while doing push-off maneuvers The os trigonum is an accessory (extra) bone that sometimes develops behind the talus (ankle bone) during adolescence. According to recent studies, approximately 30% of people have this extra bone. Pain might also occur if the flexor hallucis longus (FHL) tendon gets irritated. This can happen if the tendon doesn't fit well because the tunnel. OS TRIGONUM. The os trigonum (Figures 3 and and4) 4) is an accessory ossicle posterior to the talus and is relatively common, with an incidence of 7-8% (16,17). The posterior process of the talus contains two tuberosities, the medial and the lateral, divided by the sulcus of the flexor hallucis longus tendon An X-ray and MRI can be done to see the os trigonum and to determine if there are any tendon injuries. Treatment. If posterior ankle impingement is diagnosed, the first treatment is physical therapy and rest from the offending activity. Occasionally, a walking boot or cast can be used to limit motion at the ankle and decrease the inflammation

Posterior ankle impingement (os trigonum) syndrome

An os trigonum (arrow) is also present A strikingly sclerotic, irregular calcaneal apophysis is often encountered in 8-10 year old girls and 9-12 year old boys who complain of heel pain during this period of rapid growth in length of the calcaneal tubercle Os trigonum fractures are seen rarely. Our patient was a 16-year-old male patient who applied to our emergency service with right ankle pain due to acute hyperplantar flexion while playing football An MRI has demonstrated that there is bone oedema within the os trigonum. There is a small amount of subchondral cyst formation and reactive change in the posterior process of the talus adjacent to the synchondrosis. The appearance suggests an unstable os trigonum. The os is also quite large measuring approximately 12 x 12 x 7 mm

Os trigonum Radiology Case Radiopaedia

Os trigonum is located at the posterolateral aspect of the talus (resulting from a secondary ossification center that appears between the ages of 8 and 13) and can be seen on lateral radiographs of the foot Os trigonum is an accessory ossicle resulting from the failure of a secondary ossification center and located posterior to the talus. It is present in ~7 % of adults [].It usually forms between 7 and 13 years of age and fuses to the talus within 1 year of its appearance in the majority of patients, or persists as os trigonum [5, 11].Os trigonum is a triangular accessory ossicle fusing to the. In all patients, MR imaging demonstrated abnormal bone marrow signal intensity in the os trigonum and/or lateral talar tubercle, consistent with bone contusions. Two patients had a fragmented os trigonum or lateral tubercle, and two had a pseudoarthrosis of the posterolateral talus A possible stress fracture or shin splint of the left tibia was first considered. A 3-phase bone scintigraphy showed a very small focus of increased activity in the posterior left foot. A diagnosis of os trigonum syndrome was made after SPECT/CT images pinpointed the activity at the left os trigonum

An os trigonum should be differentiated from a fractured lateral-talar tubercle on a radiograph. An os trigonum is usually round or oval, with well-defined corticated margins, while a fractured lateral tubercle has irregular serrated margins between the ossicle and the posterior talus. However, a fractured fragment may also have smooth borders Os trigonum. The os trigonum or accessory talus represents a failure of fusion of the lateral tubercle of the posterior process of the talus bone. Is estimated to be present in 7-25% of adults. It can be mistaken for an avulsion fracture of lateral tubercle of talus (Shepherd fracture) or a fracture of the Stieda process. In most cases, Os. Os trigonum is an incidental radiographic finding at the posterior aspect of the talus in around 10% of the population. A small proportion are symptomatic as part of Posterior Ankle Impingement (os trigonum syndrome), in which several structural and inflammatory changes may be demonstrated on MRI.. We report a case of an os trigonum-calcaneal joint associated with dysplastic talus in a. Os Trigonum Syndrome Journal of the American Academy of Orthopaedic Surgeons, Vol. 22, No. 9 Fool Me Twice: Delayed Diagnoses in Radiology With Emphasis on Perpetuated Error Os Trigonum: typicalky the surgery involves removing the piece of bone from the inside of a tendon- the Tibialis Posterior Tendon. The tendon needs 3-4 weeks to heal, then 3-4 weeks of therapy to regain the strength. So 6-8 weeks. Sometimes longer

The os trigonum syndrome: imaging features

  1. Unlike the congenital and genetic disorders described in Chapter 9, the anatomic variants and miscellaneous skeletal anomalies described here are encountered daily in the practice of radiology.A general familiarity with these structures and their variants is necessary to lessen concern, decrease confusion, and increase the accuracy and confidence of radiographic interpretation
  2. Radiology. 2000;215(2):497-503. 5. Robinson P, Bollen SR. Posterior ankle impingement in professional soc- ery (B) images show large os trigonum with marrow edema, cystic change, and sclerosis.
  3. An Os Trigonum is a small, extra bone found at the back of the ankle. Os Trigonum Syndrome typically causes pain and stiffness at the ankle which tends to be worse when pointing your toes. There is often swelling and you may be able to feel a small lump behind the ankle which is often tender to touch

Posterior ankle impingement syndrome due to os trigonu

An os trigonum can be a source of pain for dancers due to impingement during repetitive ankle plantar flexion movements. Following excision of an os trigonum, it is important to have a gradual, progressive return-to-dance program for optimal recovery Read Mega os trigonum in progressive pseudorheumatoid dysplasia, Pediatric Radiology on DeepDyve, the largest online rental service for scholarly research with thousands of academic publications available at your fingertips Os Trigonum Resection 06:30. Thomas Harris. Arthroscopic OS Trigonum Resection 14:14. Mark Reilly. Ankle Anatomy and Radiology 07:49. Southern California Orthopedic Institute. 21 Point Arthroscopic Examination of the Ankle Feat. R. Ferkel 33:06. International Congress on Cartilage Repair of the Ankle. An os trigonum tends to be recognised following injury such as an ankle sprain, this can be because of actual injury caused by flexion, or simply the fact the foot is examined in a great deal of depth. Following diagnosis of os trigonum syndrome, non-surgical treatment is often used to relieve symptoms. This is likely to include rest. Accessory bone between the lunate and the triangular bone. 20. Epipyramis. 21. So-called os triangulare. 22. Persisting center of the ulnar styloid. 23. Small ossicle at the level of the radioulnar joint

Fracture of the os trigonum: A report of two cases and

The os trigonum syndrome, also known as talar compression syndrome, posterior ankle impingement syndrome, and posterior tibial talar impingement syndrome, is a broad term that refers to symptoms produced by pathology of the lateral tubercle of the posterior talar process. This blog is intended for radiology professionals and contains non. In 1885, Bardeleben used the term os trigonum for the ossicle, previously referred to as os intermedium tarsi. 2 The relationship between posterior ankle pain and the radiological findings of an os trigonum was first described by McDougall. 8 However, since the first descriptions of the os trigonum, there has been no consensus about its prevalence Frontal and lateral radiographs of bilateral ankles showed os trigonum (arrow heads) and os subtibiale (arrows) in both sides. (a and b) The left ankle and (c and d) the right A triple-phase bone scintigraphy was performed after intravenous injection of 18.62 mCi of technetium-99m methyl diphosphonate, with subsequent image acquisition in blood. The os trigonum is related directly to the exor hallucis longus (FHL) and KFP. The posterior part of the talobular ligament inserts on the os trigonum [8 ]. Other ligaments of * Paweł Szaro pawel.szaro@gu.se 1 Department of Radiology, Institute of Clinical Sciences, Sahlgrenska Academy, University of Gothenburg, Gothenburg, Sweden 2 Department. Os Trigonum / Posterior Talar Impingement. - on X-rays, 31 of 44 feet showed the os trigonum. Only 10 of these 27 feet (37%) had a symptomatic os trigonum; - Bone scintigraphic findings of os trigonum: a prospective study of 100 soldiers on active duty . Anatomy of the os trigonum. Stenosing tenosynovitis of the flexor hallucis longus tendon.

Video: Os Conundrum: Identifying Symptomatic Sesamoids and

Os trigonum syndrome. • Information and Pearls: • An os trigonum is an unfused posterior lateral talar process. • An elongated and fused posterior lateral talar tubercle is known as a Stieda process. • There is an estimated 10-15% os trigonum prevalence. • The posterior talofibular ligament attaches to the posterior lateral talar process Radiology, 2. Orthopaedic Surgery, T Pain can be caused by disruption of the cartilaginous synchondrosis between the os trigonum and the lateral talar tubercle as a result of repetitive.

Posterior Impingement / Os Trigonum / Trigonal Process

OS TRIGONUM EXCISION Phase I: Weeks 0 - 2 • Week 1: CAM Boot and Partial Weight Bearing with Crutches • Week 2: Weight Bearing as Tolerated and work into shoe as able § Start Physical Therapy Phase II: Weeks 2 - 6 (1 - 2 x week physical therapy) • Weight bearing as tolerated • Exercises 2-4 weeks: § Gait Trainin The os trigonum is a ossicle (extra bone) variant that occurs in the back of the ankle/subtalar joint. Typically occurs from birth and is present usually in both extremities. Pictured below is a female patient who had very large symptomatic ossicle that was very painful with activity especiallat any activity involved the ankle pointing the foot. Posterior ankle impingement syndrome due to os trigonum. Appl Radiol. November 30, 2011. Categories: Clinical Departments | Imaging Modalities. Tweets by @Applied_Rad.

Posterior talar process fracture | Image | Radiopaedia

The Radiology Assistant : MRI examination of the ankl

Posterior ankle impingement syndrome (Os trigonum syndrome

Injection - os trigonum CSI - YouTub

Radiographs of the right ankle showed the presence of a large os trigonum with osteosclerotic changes, whereas magnetic resonance imaging showed intraosseous tophus deposits in the os trigonum. Conservative therapy failed, and the patient was admitted for an endoscopic resection of the os trigonum An os trigonum (arrowheads) is demonstrated on lateral ankle radiograph (a) and sagittal fat-suppressed proton-density-weighted image (b) in a 12-year-old boy with posterior ankle pain. Adjacent soft-tissue edema-like signal intensity is present on the MRI with synovitis/joint effusion in the posterior recesses of the tibiotalar and posterior. Fracture of the os trigonum per se is extremely rare. Hyperplantarflexion of the ankle is the mechanism of injury in which the os trigonum is compressed between the posterior malleolus of the tibia and the tuber calcaneus. Computed tomography is the choice of imaging modality in cases where fractures of posterior talus structures, including the. Os trigonum is a rare pathology since most of the series only report a small number of adult patients and a review of the literature only found a few cases in adolescents , , , , . The mean patient age in the longest series reported (43 cases) was 27 years and the youngest patient was 16 years old . Our series is the first pediatric series

Os subfibulare is a rarely reported ossicle involving the inferior portion of the fibular tuberosity of the ankle. In general, accessory ossicles commonly observed in order of frequency of the lower extremity include: tibiale externum, os trigonum and os peroneum PURPOSE:Os trigonum syndrome is a rare condition, often affecting athletes. A paucity of data exists on the incidence of os trigonum syndrome in nonathletic population. The study aimed to determine the incidence and clinical characteristics of os trigonum syndrome in nonathletic patients with sprained ankles The os trigonum is an extra bone that occurs behind the ankle off of the back of the ankle bone (the talus). Most people don't know they have an os trigonum since unlike the os navicularis and the os peroneum it cannot cause a lump on the outside of the foot Objective. The objective of this study was to evaluate the value of magnetic resonance (MR) imaging in the diagnosis of the os trigonum syndrome. Design. Sagittal and coronal spin echo MR sequences of the ankle were acquired along with sagittal images in both dorsiflexion and plantar flexion. Patients. Three consecutive patients presenting with posterior triangle pain were assessed. Results. Figure 1: Os Trigonum (circled in red) on plain ankle x-ray (top) and MRI (bottom). Treatment Non-Operative Treatment. If the condition is not related to a mechanical irritation, such as a loose body or a bone spur, the condition can usually be treated successfully without surgery. Rest and relative immobilization, followed by a period of.

Note : the small separate bone posterior to the tibia is the os trigonum. Usually the os trigonum has a smooth cortex, and yet this accessory ossicle is somewhat jagged anteriorly; no matter, sometimes a normal os trigonum can have a rather jagged cortex. OCD lesions affecting the dome of the talus . . . See : Accident & Emergency Radiology : A. Purpose The aim of the study was to examine the ligaments of the os trigonum. Methods The ankle joint magnetic resonance imaging (MRI) of 104 patients with the os trigonum (experimental group) and. American College of Radiology (Add filter) 04 December 2019 abnormalities between the talus and an os trigonum or fractures of the lateral tubercle of the talus or os trigonum [62]... 2232 D. Hayashi et al. / European Journal of Radiology 84 (2015) 2231-2241 Fig. 1. Schematic illustration of os trigonum, osteophytes and Stieda's process

Os Trigonum Syndrome: Causes, Symptoms, Treatmen

Os trigonum syndrome with flexor hallucis longus tenosynovitis in a professional football referee. Med. Sci. Sports Exerc., Vol. 31, No. 7(Suppl.), pp. S493-S496, 1999. The presentation of posterior ankle pain in any patient poses a diagnostic dilemma. The os trigonum syndrome and flexor hallucis longus stenosing tenosynovitis have been reported to occur in professional and amateur ballet dancers Radiographs are helpful for demonstrating the presence of an os trigonum or large trigonal process. Magnetic resonance imaging (MRI) is the preferred test for assessing the pathoanatomy of the os trigonum, which is best demonstrated by bone marrow edema of the os trigonum and adjacent talus Unlike conventional os trigonum syndrome, plain X-rays often fail to show the lesions which are readily visible on three-dimensional imaging. The bony fragments are often seen to be medial to the FHL tendon in contrast to the typical os trigonum which is on the lateral side of this tendon

Os Trigonum - Sumer's Radiology Blo

Playlist by user 'g-makris09' (207 entries) There is a focal lucency with sclerotic borders at the superomedial corner of the talar dome, best appreciated on the medial oblique (mortise) view, mostly consistent with an osteochondral defect (osteochondritis dissecans) Os Trigonum Removal by Posterior Arthroscopy Feat. N. Van Dijk 03:12. Guilherme Carpeggiani. Monocortical External Fixator Application in Ankle Fracture Dislocations u Feat. G. Carpeggiani, T. Maluta 16:22. FORE 2014 Current Solutions in Foot and Ankle Surgery. UCSD Musculoskeletal Radiology. bonepit.com. Normal variants. Tibia . Tibial tug lesions 83F Soleal stripe 86M Soleal stripe 63M Soleal stripe 75M Parsons tubercle and Soleal stripe 63F Os trigonum 11M Georgio Armani Reverbation ant tib artifact.

MRI Musculo-Skeletal Section: Posterior ankle impingementIntraosseous Tophus Deposits in the Os Trigonum

Anatomical variation in the ankle and foot: from

An os trigonum is an accessory bone located posterior to the talus. It is the second most common accessory bone found in the foot, 41 with an overall prevalence ranging from 12.7% to 23.5% in the general population. 8, 41 Despite a relatively high prevalence, the existence of an os trigonum does not typically result in pain or limited ankle plantar flexion motion. 14, 22, 41 In the dancing. Os Trigonum Removal by Posterior Arthroscopy. FEATURING Niek Van Dijk. 1,104 views August 2, 2019 7 ; 06:30. Thomas Harris Arthroscopic OS Trigonum Resection. 3,084 views March 12, 2018 20 ; 12:04. NYU Langone Orthopedics Os Trigonum Excision: Posteromedial Approach. FEATURING Amos. Os Navicularis Syndrome. The os navicularis is an accessory ossicle or small bone that is a normal variant however may predispose to certain tendon injuries and may itself be a source of pain. The os navicularis (or accessory navicular) is found alongside the navicular bone, the boney prominence on your inside foot just above the arch of the foot Abstract. Posterior ankle impingement syndrome (PAIS) can be caused by osseous pathology from the posterior aspect of the talus. The commonest cause is an os trigonum, an accessory ossicle arising from the lateral tubercle of the posterior talus. We have observed cases where the osseous impingement is due to a chronic fracture nonunion of the medial tubercle of the posterior talus with unique.

Anatomy of the talus | Radiology Case | RadiopaediaOs cuboideum secundarium: A rare accessory ossicle withRadiology Cases: Fractured Os Peroneum, Painful Os
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