Introduction Navicular fractures can be traumatic navicular avulsion fractures mechanism is plantarflexion or eversion/inversion can involve talonavicular or naviculocuneiform ligaments navicular tuberosity fractures mechanism is eversion with simultaneous contraction of PTT may represent an acute widening/diastasis of an accessory navicular navicular body fractures mechanism is axial loading stress fracture mechanism of injury is usually due to chronic overuse often seen in athletes running on hard surfaces also common in baseball players considered a high risk injury due to risk of AVN most common complications include delayed union and non-union Spontaneous navicular AVN (Mueller-Weiss syndrome) Spontaenous navicular AVN is a rare disease that and can be seen in middle aged adults with chronic midfoot pain Anatomy Articulations navicular bone articulates with cuneiforms cuboid calcaneus talus Biomechanics navicular bone and its articulations play an important role in inversion and eversion biomechanics and motion Classification Sangeorzan Classification of Navicular Body Fractures(based on plane of fracture and degree of comminution) Type I Transverse fracture of dorsal fragment that involves < 50% of bone.No associated deformity Type II Oblique fracture, usually from dorsal-lateral to plantar-medial.May have forefoot aDDuction deformity. Type IIII Central or lateral comminution.ABDuction deformity. Presentation Symptoms vague midfoot pain and swelling Physical exam midfoot swelling tenderness to palpation of midfoot usually full ROM of ankle and subtalar joint Imaging Radiographs may be difficult to see and are often missed recommended views AP lateral oblique 45 degree radiograph best to visualize tuberosity fractures CT more sensitive to identify fracture than radiographs MRI will show signal intensity on T2 image due to inflammation Treatment of Stress Fractures Nonoperative cast immobilization with no weight bearing indications any navicular stress fracture, regardless of type, can be initially treated with cast immobilization and nonweight bearing for 6-8 weeks with high rates of success Operative open reduction and internal fixation indications high level athletes nonunion of navicular stress fracture failure of cast immobilization and non weight bearing Treatment of Traumatic Fractures Nonoperative cast immobilization with no weight bearing indications acute avulsion fractures most tuberosity fractures minimally displaced Type I and II navicular body fractures Operative fragment excision indications avulsion fractures that failed to improve with nonoperative modalities tuberosity fractures that went on to symptomatic nonunion open reduction and internal fixation indications avulsion fractures involving > 25% of articular surface tuberosity fractures with > 5mm diastasis or large intra-articular fragment displaced or intra-articular Type I and II navicular body fractures technique medial approach used for Type I and II navicular body fractures ORIF followed by external fixation vs. primary fusion indications Type III navicular body fractures navicular avascular necrosis technique must maintain lateral column length fusion of talonavicular and naviculocuneiform joints in navicular avascular necrosis
QUESTIONS 1 of 8 1 2 3 4 5 6 7 8 Previous Next Sorry, this question is for PEAK Premium Subscribers only Upgrade to PEAK You have 100% on this question. Just skip this one for now. Take This Question Anyway (SBQ12FA.26) A 45-year-old man presents to the orthopaedic clinic complaining of several weeks of increasing midfoot pain during and after his daily run that he recently resumed after a 2-week vacation. He is found on imaging to have a navicular stress fracture. What is the most appropriate initial immobilization and weight-bearing status for this patient? Review Topic | Tested Concept QID: 3833 Type & Select Correct Answer 1 Hard-sole shoe and non-weight bearing 5% (170/3221) 2 Hard-sole shoe and partial weight bearing 5% (161/3221) 3 Walking boot and partial weight bearing 12% (399/3221) 4 Short leg cast and non-weight bearing 73% (2367/3221) 5 Short leg cast and partial-weight bearing 3% (99/3221) L 2 Question Complexity B Question Importance Select Answer to see Preferred Response SUBMIT RESPONSE 4 Sorry, this question is for PEAK Premium Subscribers only Upgrade to PEAK You have 100% on this question. Just skip this one for now. Take This Question Anyway (OBQ12.256) A 21-year-old recreational baseball player presents for evaluation of anterior ankle pain that has been persistent for the past 6-8 weeks. On physical exam he is tender over the midfoot, but has full strength with dorsiflexion, plantarflexion and inversion. His radiographs are read as normal; radiographs are shown in Figure A. Representative MRI sequences are shown Figures B and C. What is the most appropriate treatment for this patient? Review Topic | Tested Concept QID: 4616 FIGURES: A B C Type & Select Correct Answer 1 Observation alone 4% (112/2793) 2 Cortisone injection in to the anterior tibial tendon sheath 1% (23/2793) 3 Partial weight bearing in a boot 13% (357/2793) 4 Non-weightbearing in a cast for planned 6-8 weeks 78% (2189/2793) 5 Open reduction internal fixation of the fracture 3% (95/2793) L 2 Question Complexity B Question Importance Select Answer to see Preferred Response SUBMIT RESPONSE 4 Sorry, this question is for PEAK Premium Subscribers only Upgrade to PEAK You have 100% on this question. Just skip this one for now. Take This Question Anyway This is an AAOS Self Assessment Exam (SAE) question. Orthobullets was not involved in the editorial process and does not have the ability to alter the question. If you prefer to hide SAE questions, simply turn them off in your Learning Goals. (SAE07SM.72) An 18-year-old gymnast has had a 1-year history of foot pain. Examination reveals medial midfoot tenderness without swelling. Non-weight-bearing in a cast for 6 weeks has failed to provide relief. An axial CT scan of the midfoot is shown in Figure 20. What is the optimal treatment for this condition? Review Topic | Tested Concept QID: 8734 FIGURES: A Type & Select Correct Answer 1 Partial weight bearing in a walking cast for an additional 6 weeks 4% (9/257) 2 Open reduction and internal fixation 29% (75/257) 3 Open reduction and internal fixation with autologous bone grafting 58% (148/257) 4 No treatment 1% (2/257) 5 Non-weight-bearing in a cast for an additional 6 weeks 7% (18/257) L 4 Question Complexity E Question Importance Select Answer to see Preferred Response SUBMIT RESPONSE 3 You have 100% on this question. Just skip this one for now. Take This Question Anyway (SBQ07SM.35) What is the most common complication associated with the injury seen in Figure A? Review Topic | Tested Concept QID: 1420 FIGURES: A Type & Select Correct Answer 1 Malunion 7% (334/4998) 2 Non-union 81% (4071/4998) 3 Infection 1% (25/4998) 4 Longitudinal arch instability 10% (510/4998) 5 Neurovascular injury 1% (32/4998) L 2 Question Complexity C Question Importance Select Answer to see Preferred Response SUBMIT RESPONSE 2 You have 100% on this question. Just skip this one for now. Take This Question Anyway (OBQ06.61) A 24-year-old female who is training for her first marathon presents with six weeks of increasing foot pain. An AP radiograph and representative axial cut of her CT scan of her injury are seen in figures A and B. Management should consist of which of the following? Review Topic | Tested Concept QID: 172 FIGURES: A B Type & Select Correct Answer 1 Weight bearing as tolerated in a hard soled shoe 6% (118/2096) 2 Non weight bearing cast immobilization 67% (1408/2096) 3 Fragment excision and posterior tibial tendon advancement 2% (40/2096) 4 Percutaneous screw fixation 17% (356/2096) 5 Open reduction with autologous bone graft 8% (167/2096) L 2 Question Complexity D Question Importance Select Answer to see Preferred Response SUBMIT RESPONSE 2
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