Joint dislocation explained

Joint dislocation
Synonyms:	Latin: luxatio

A joint dislocation, also called luxation, occurs when there is an abnormal separation in the joint, where two or more bones meet.^[1] A partial dislocation is referred to as a subluxation. Dislocations are often caused by sudden trauma on the joint like an impact or fall. A joint dislocation can cause damage to the surrounding ligaments, tendons, muscles, and nerves.^[2] Dislocations can occur in any major joint (shoulder, knees, etc.) or minor joint (toes, fingers, etc.). The most common joint dislocation is a shoulder dislocation.

Treatment for joint dislocation is usually by closed reduction, that is, skilled manipulation to return the bones to their normal position. Reduction should only be performed by trained medical professionals, because it can cause injury to soft tissue and/or the nerves and vascular structures around the dislocation.^[3]

Symptoms and signs

The following symptoms are common with any type of dislocation.

• Intense pain
• Joint instability
• Deformity of the joint area
• Reduced muscle strength
• Bruising or redness of joint area
• Difficulty moving joint
• Stiffness

Causes

Joint dislocations are caused by trauma to the joint or when an individual falls on a specific joint. Great and sudden force applied, by either a blow or fall, to the joint can cause the bones in the joint to be displaced or dislocated from normal position. With each dislocation, the ligaments keeping the bones fixed in the correct position can be damaged or loosened, making it easier for the joint to be dislocated in the future.

Some individuals are prone to dislocations due to congenital conditions, such as hypermobility syndrome and Ehlers-Danlos Syndrome. Hypermobility syndrome is genetically inherited disorder that is thought to affect the encoding of the connective tissue protein’s collagen in the ligament of joints.^[4] The loosened or stretched ligaments in the joint provide little stability and allow for the jo

Diagnosis

Some times dislocation can also occur because of Rheumatoid arthritis, In Rheumatoid arthritis the production of synovial fluid decrease gradually causing pain, swollen joint, and stiffness. A forceful push causes friction and can dislocate the joint. Initial evaluation of a suspected joint dislocation should begin with a thorough patient history, including mechanism of injury, and physical examination. Special attention should be focused on the neurovascular exam both before and after reduction, as injury to these structures may occur during the injury or during the reduction process. Subsequent imaging studies are frequently obtained to assist with diagnosis.

• Standard plain radiographs, usually a minimum of 2 views
  • Generally, pre- and post-reduction X-rays are recommended. Initial X-ray can confirm the diagnosis as well as evaluate for any concomitant fractures. Post-reduction radiographs confirm successful reduction alignment and can exclude any other bony injuries that may have been caused during the reduction procedure.^[5]
  • In certain instances if initial X-rays are normal but injury is suspected, there is possible benefit of stress/weight-bearing views to further assess for disruption of ligamentous structures and/or need for surgical intervention. This may be utilized with AC joint separations.^[6]
  • Nomenclature: Joint dislocations are named based on the distal component in relation to the proximal one.^[7]
• Ultrasound
  • Ultrasound may be useful in an acute setting, particularly with suspected shoulder dislocations. Although it may not be as accurate in detecting any associated fractures, in one observational study ultrasonography identified 100% of shoulder dislocations, and was 100% sensitive in identifying successful reduction when compared to plain radiographs.^[8] Ultrasound may also have utility in diagnosing AC joint dislocations.^[9]
  • In infants <6 months of age with suspected developmental dysplasia of the hip (congenital hip dislocation), ultrasound is the imaging study of choice as the proximal femoral epiphysis has not significantly ossified at this age.^[10]
• Cross-sectional imaging (CT or MRI)
  • Plain films are generally sufficient in making a joint dislocation diagnosis. However, cross-sectional imaging can subsequently be used to better define and evaluate abnormalities that may be missed or not clearly seen on plain X-rays. CT is useful in further analyzing any bony aberrations, and CT angiogram may be utilized if vascular injury is suspected.^[11] In addition to improved visualization of bony abnormalities, MRI permits for a more detailed inspection of the joint-supporting structures in order to assess for ligamentous and other soft tissue injury.

Treatment

A dislocated joint usually can be successfully reduced into its normal position only by a trained medical professional. Trying to reduce a joint without any training could substantially worsen the injury.^[12]

X-rays are usually taken to confirm a diagnosis and detect any fractures which may also have occurred at the time of dislocation. A dislocation is easily seen on an X-ray.^[13]

Once a diagnosis is confirmed, the joint is usually manipulated back into position. This can be a very painful process, therefore this is typically done either in the emergency department under sedation or in an operating room under a general anaesthetic.^[14]

It is important the joint is reduced as soon as possible, as in the state of dislocation, the blood supply to the joint (or distal anatomy) may be compromised. This is especially true in the case of a dislocated ankle, due to the anatomy of the blood supply to the foot.^[15]

Shoulder injuries can also be surgically stabilized, depending on the severity, using arthroscopic surgery. The most common treatment method for a dislocation of the Glenohumeral Joint (GH Joint/Shoulder Joint) is exercise based management.^[16] Another method of treatment is to place the injured arm in a sling or in another immobilizing device in order to keep the joint stable.^[17] A 2012 Cochrane review, found no statistically significant difference in healing or long-term joint mobility between simple shoulder dislocations treated conservatively versus surgically.^[18]

Some joints are more at risk of becoming dislocated again after an initial injury. This is due to the weakening of the muscles and ligaments which hold the joint in place. The shoulder is a prime example of this. Any shoulder dislocation should be followed up with thorough physiotherapy.

On field reduction is crucial for joint dislocations. As they are extremely common in sports events, managing them correctly at the game at the time of injury, can reduce long term issues. They require prompt evaluation, diagnosis, reduction, and postreduction management before the person can be evaluated at a medical facility.^[17]

After care

After a dislocation, injured joints are usually held in place by a splint (for straight joints like fingers and toes) or a bandage (for complex joints like shoulders). Additionally, the joint muscles, tendons and ligaments must also be strengthened. This is usually done through a course of physiotherapy, which will also help reduce the chances of repeated dislocations of the same joint.^[19]

For glenohumeral instability, the therapeutic program depends on specific characteristics of the instability pattern, severity, recurrence and direction with adaptations made based on the needs of the patient. In general, the therapeutic program should focus on restoration of strength, normalization of range of motion and optimization of flexibility and muscular performance. Throughout all stages of the rehabilitation program, it is important to take all related joints and structures into consideration.^[20]

Epidemiology

• Each joint in the body can be dislocated, however, there are common sites where most dislocations occur. The following structures are the most common sites of joint dislocations:
• Dislocated shoulder
  • Shoulder dislocations account for 45% of all dislocation visits to the emergency room.^[21] Anterior shoulder dislocation, the most common type of shoulder dislocation (96-98% of the time) occurs when the arm is in external rotation and abduction (away from the body) produces a force that displaces the humeral head anteriorly and downwardly.^[21] Vessel and nerve injuries during a shoulder dislocation is rare, but can cause many impairments and requires a longer recovery process.^[21] There is a 39% average rate of recurrence of anterior shoulder dislocation, with age, sex, hyperlaxity and greater tuberosity fractures being the key risk factors.^[22]
• Knee: Patellar dislocation
  • Many different knee injuries can happen. Three percent of knee injuries are acute traumatic patellar dislocations.^[23] Because dislocations make the knee unstable, 15% of patellas will re-dislocate.^[24]
  • Patellar dislocations often occur when the knee is in full extension and sustains a trauma from the lateral to medial side.^[25]
• Elbow: Posterior dislocation, 90% of all elbow dislocations
• Wrist: Lunate and Perilunate dislocation most common^[26]
• Finger: Interphalangeal (IP) or metacarpophalangeal (MCP) joint dislocations
  • In the United States, men are most likely to sustain a finger dislocation with an incidence rate of 17.8 per 100,000 person-years.^[27] Women have an incidence rate of 4.65 per 100,000 person-years. The average age group that sustain a finger dislocation are between 15 and 19 years old.
• Hip: Posterior and anterior dislocation of hip
  • Anterior dislocations are less common than posterior dislocations. 10% of all dislocations are anterior and this is broken down into superior and inferior types.^[28] Superior dislocations account for 10% of all anterior dislocations, and inferior dislocations account for 90%. 16-40 year old males are more likely to receive dislocations due to a car accident. When an individual receives a hip dislocation, there is an incidence rate of 95% that they will receive an injury to another part of their body as well. 46–84% of hip dislocations occur secondary to traffic accidents, the remaining percentage is due based on falls, industrial accidents or sporting injury.^[22]
• Foot and Ankle:
  • Lisfranc injury is a dislocation or fracture-dislocation injury at the tarsometatarsal joints
  • Subtalar dislocation, or talocalcaneonavicular dislocation, is a simultaneous dislocation of the talar joints at the talocalcaneal and talonavicular levels.^{[29] [30]} Subtalar dislocations without associated fractures represent about 1% of all traumatic injuries of the foot and 1-2 % of all dislocations, and they are associated with high energy trauma. Early closed reduction is recommended, otherwise open reduction without further delay.^[31]
  • Total talar dislocation is very rare and has very high rates of complications.^{[32] [33]}
  • Ankle Sprains primarily occur as a result of tearing the ATFL (anterior talofibular ligament) in the Talocrural Joint. The ATFL tears most easily when the foot is in plantarflexion and inversion.^[34]
  • Ankle dislocation without fracture is rare.^[35]

See also

• Buddy wrapping
• Major trauma
• Physical therapy
• Projectional radiography
• Listhesis, olisthesis, or olisthy

Notes and References

1. Dislocations. Lucile Packard Children’s Hospital at Stanford. Retrieved 3 March 2013. http://www.lpch.org/DiseaseHealthInfo/HealthLibrary/orthopaedics/dislocat.html
2. Smith, R. L., & Brunolli, J. J. (1990). Shoulder kinesthesia after anterior glenohumeral joint dislocation. Journal of Orthopaedic & Sports Physical Therapy, 11(11), 507–513.
3. Skelley. Nathan W.. McCormick. Jeremy J.. Smith. Matthew V.. May 2014. In-game Management of Common Joint Dislocations. Sports Health. 6. 3. 246–255. 10.1177/1941738113499721. 4000468. 24790695.
4. Ruemper, A. & Watkins, K. (2012). Correlations between general joint hypermobility and joint hypermobility syndrome and injury in contemporary dance students. Journal of Dance Medicine & Science, 16(4): 161–166.
5. Chong. Mark. Karataglis. Dimitris. Learmonth. Duncan. September 2006. Survey of the Management of Acute Traumatic First-Time Anterior Shoulder Dislocation Among Trauma Clinicians in the UK. Annals of the Royal College of Surgeons of England. 88. 5. 454–458. 10.1308/003588406X117115. 0035-8843. 1964698. 17002849.
6. Web site: Acromioclavicular injury Radiology Reference Article Radiopaedia.org. Gaillard. Frank. radiopaedia.org. en. 21 February 2018.
7. Web site: Introduction to Trauma X-ray - Dislocation injury. www.radiologymasterclass.co.uk. en-US. 15 February 2018.
8. Abbasi. Saeed. Molaie. Hooshyar. Hafezimoghadam. Peyman. Zare. Mohammad Amin. Abbasi. Mohsen. Rezai. Mahdi. Farsi. Davood. August 2013. Diagnostic accuracy of ultrasonographic examination in the management of shoulder dislocation in the emergency department. Annals of Emergency Medicine. 62. 2. 170–175. 10.1016/j.annemergmed.2013.01.022. 1097-6760. 23489654. free.
9. Heers. Guido. Hedtmann. Achim. Correlation of ultrasonographic findings to Tossy's and Rockwood's classification of acromioclavicular joint injuries. Ultrasound in Medicine & Biology. 31. 6. 725–732. 10.1016/j.ultrasmedbio.2005.03.002. 15936487. 2005.
10. Web site: Developmental dysplasia of the hip Radiology Reference Article Radiopaedia.org. Gaillard. Frank. radiopaedia.org. en. 21 February 2018.
11. Web site: UpToDate. www.uptodate.com. 21 February 2018.
12. Bankart, A. (2004). The pathology and treatment of recurrent dislocation of the shoulder-joint. Acta Orthop Belg. 70: 515–519
13. Dias, J., Steingold, R., Richardson, R., Tesfayohannes, B., Gregg, P. (1987). The conservative treatment of acromioclavicular dislocation. British Editorial Society of Bone and Joint Surgery. 69(5): 719–722.
14. Holdsworth, F. (1970). Fractures, dislocations, and fracture dislocations of the spine. The Journal of Bone and Joint Surgery. 52 (8): 1534–1551.
15. Ganz, R., Gill, T., Gautier, E., Ganz, K., Krugel, N., Berlemann, U. (2001). Surgical dislocation of the adult hip. The Journal of Bone and Joint Surgery. 83(8): 1119–1124.
16. Warby. Sarah A.. Pizzari. Tania. Ford. Jon J.. Hahne. Andrew J.. Watson. Lyn. 1 January 2014. The effect of exercise-based management for multidirectional instability of the glenohumeral joint: a systematic review. Journal of Shoulder and Elbow Surgery. 23. 1. 128–142. 10.1016/j.jse.2013.08.006. 24331125. free.
17. Skelley. Nathan W.. McCormick. Jeremy J.. Smith. Matthew V.. 4 April 2017. In-game Management of Common Joint Dislocations. Sports Health. 6. 3. 246–255. 10.1177/1941738113499721. 1941-7381. 4000468. 24790695.
18. Taylor . Fraser . Sims . Martyn . Theis . Jean-Claude . Herbison . G Peter . 2012-04-18 . Cochrane Bone, Joint and Muscle Trauma Group . Interventions for treating acute elbow dislocations in adults . Cochrane Database of Systematic Reviews . 2012 . 4 . CD007908 . en . 10.1002/14651858.CD007908.pub2 . 6465046 . 22513954.
19. Itoi, E., Hatakeyama, Y., Kido, T., Sato, T., Minagawa, H., Wakabayashi, I., Kobayashi, M. (2003). Journal of Shoulder and Elbow Surgery. 12(5): 413–415.
20. Cools. Ann M.. Borms. Dorien. Castelein. Birgit. Vanderstukken. Fran. Johansson. Fredrik R.. 1 February 2016. Evidence-based rehabilitation of athletes with glenohumeral instability. Knee Surgery, Sports Traumatology, Arthroscopy. en. 24. 2. 382–389. 10.1007/s00167-015-3940-x. 26704789. 21227767. 0942-2056.
21. Khiami. F.. Gérometta. A.. Loriaut. P.. Management of recent first-time anterior shoulder dislocations. Orthopaedics & Traumatology: Surgery & Research. 101. 1. S51–S57. 10.1016/j.otsr.2014.06.027. 25596982. 2015. free.
22. Olds. M.. Ellis. R.. Donaldson. K.. Parmar. P.. Kersten. P.. 1 July 2015. Risk factors which predispose first-time traumatic anterior shoulder dislocations to recurrent instability in adults: a systematic review and meta-analysis. Br J Sports Med. en. 49. 14. 913–922. 10.1136/bjsports-2014-094342. 0306-3674. 4687692. 25900943.
23. Hsiao. Mark. Owens. Brett D.. Burks. Robert. Sturdivant. Rodney X.. Cameron. Kenneth L.. 1 October 2010. Incidence of Acute Traumatic Patellar Dislocation Among Active-Duty United States Military Service Members. The American Journal of Sports Medicine. en. 38. 10. 1997–2004. 10.1177/0363546510371423. 0363-5465. 20616375. 19131206.
24. Fithian. Donald C.. Paxton. Elizabeth W.. Stone. Mary Lou. Silva. Patricia. Davis. Daniel K.. Elias. David A.. White. Lawrence M.. 1 July 2004. Epidemiology and Natural History of Acute Patellar Dislocation. The American Journal of Sports Medicine. en. 32. 5. 1114–1121. 10.1177/0363546503260788. 0363-5465. 15262631. 11899852.
25. Ramponi. Denise. Patellar Dislocations and Reduction Procedure. Advanced Emergency Nursing Journal. 38. 2. 89–92. 10.1097/tme.0000000000000104. 27139130. 2016. 42552493.
26. Web site: Carpal dislocations. https://web.archive.org/web/20141224214101/http://www.rcsed.ac.uk/fellows/lvanrensburg/classification/hand/carpal_dislocations.htm. 24 December 2014. 5 March 2013. live.
27. Golan. Elan. Kang. Kevin K.. Culbertson. Maya. Choueka. Jack. The Epidemiology of Finger Dislocations Presenting for Emergency Care Within the United States. HAND. 11. 2. 192–6. 10.1177/1558944715627232. 4920528. 27390562. 2016.
28. Clegg. Travis E.. Roberts. Craig S.. Greene. Joseph W.. Prather. Brad A.. Hip dislocations—Epidemiology, treatment, and outcomes. Injury. 41. 4. 329–334. 10.1016/j.injury.2009.08.007. 19796765. 2010.
29. Ruhlmann F, Poujardieu C, Vernois J, Gayet LE . Isolated Acute Traumatic Subtalar Dislocations: Review of 13 Cases at a Mean Follow-Up of 6 Years and Literature Review . The Journal of Foot and Ankle Surgery . 56 . 1 . 201–207 . 2017 . 26947001 . 10.1053/j.jfas.2016.01.044 . 31290747 . Review.
30. García-Regal J, Centeno-Ruano AJ . [Talocalcaneonavicular dislocation without associated fractures] . es . Acta Ortopedica Mexicana . 27 . 3 . 201–4 . 2013 . 24707608 . Review.
31. Prada-Cañizares A, Auñón-Martín I, ((Vilá Y Rico J)), Pretell-Mazzini J . Subtalar dislocation: management and prognosis for an uncommon orthopaedic condition . International Orthopaedics . 40 . 5 . 999–1007 . May 2016 . 26208589 . 10.1007/s00264-015-2910-8 . 6090499 . Review.
32. Book: Michael A. Foy. Phillip S. Fagg. Medicolegal Reporting in Orthopaedic Trauma E-Book. 5 December 2011. Elsevier Health Sciences. 978-0-7020-4886-9. 320–.
33. For a graphic representation of displacements that may lead to a total talar dislocation see: Book: Robert W. Bucholz. Rockwood and Green's Fractures in Adults: Two Volumes Plus Integrated Content Website (Rockwood, Green, and Wilkins' Fractures). 29 March 2012. Lippincott Williams & Wilkins. 978-1-4511-6144-1. 2061.
34. Ringleb. Stacie I.. Dhakal. Ajaya. Anderson. Claude D.. Bawab. Sebastain. Paranjape. Rajesh. 1 October 2011. Effects of lateral ligament sectioning on the stability of the ankle and subtalar joint. Journal of Orthopaedic Research. en. 29. 10. 1459–1464. 10.1002/jor.21407. 21445995. 1554-527X. free.
35. Wight L, Owen D, Goldbloom D, Knupp M . Pure Ankle Dislocation: A systematic review of the literature and estimation of incidence . Injury . 48 . 10 . 2027–2034 . October 2017 . 28826653 . 10.1016/j.injury.2017.08.011 . Review.