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Show detailsContinuing Education Activity
Philadelphia orthopedic surgeon John Rhea Barton first described a Barton fracture. It is a fracture of the distal radius which extends through the dorsal aspect of the articular surface with associated dislocation of the radiocarpal joint; however, since there is no disruption of the radiocarpal ligaments, the articular surface of the fractured distal radius remains in contact with the proximal carpal row. This activity reviews the cause, pathophysiology, and presentation of barton's fracture and highlights the role of the interprofessional team in the management of these patients.
Objectives:
- Describe the pathophysiology of Barton fracture.
- Review the evaluation of a patient with a suspected Barton fracture.
- Outline the treatment and management options available for Barton's fracture.
- Explain interprofessional team strategies for improving care and outcomes in patients with Barton fractures.
Introduction
Philadelphia orthopedic surgeon John Rhea Barton first described a Barton fracture. It is a fracture of the distal radius which extends through the dorsal aspect of the articular surface with associated dislocation of the radiocarpal joint.[1] There is no disruption of the radiocarpal ligaments, and the articular surface of the fractured distal radius remains in contact with the proximal carpal row.[1][2]This preserved relationship between the radius and carpus is what distinguishes the Barton fracture from other types of distal radius fracture/dislocations. The distal radius fracture may involve either the volar or dorsal cortex. Volar and dorsal barton fractures are subclassified based on the fracture pattern. As compared to the dorsal rim fracture, the volar barton fracture occurs more frequently. Non-union of barton fracture is less likely because the distal radius has a large proportion of cancellous bone. On the other hand, an anatomical reduction is required as malunion and wrist arthritis are common following barton fractures.[3] The wrist's ability to deviate ulnarly for a power grab depends on the distal radius articular surface's volar and ulnar slope. The volar surface of the distal radius is comparatively flat. The volar radiocarpal ligaments originate from a ridge of the distal radial border. It's crucial to comprehend that the distal radial cortical edge slopes laterally toward the ulnar. From proximal to distal, the lunate facet's ulnar volar border slopes 3mm vertically making a difficult internal fixation. The lunate fossa appears as a teardrop sign on the lateral radiograph. Failure to support this lunate border would lead to incompetent short radiolunate ligament resulting in radiocarpal instability.[4]
Etiology
The most common mechanisms of injury vary depending on the patient population. In the pediatric and young adult population, most Barton fractures result from sporting activities and motor vehicle accidents. The most common reason for it to happen is a direct, traumatic wrist injury. Young male workers or motorcycle riders account for 70% of Barton's fracture cases. However, in the elderly, particularly women, decreased bone density from osteoporosis means that less force is needed to cause this injury. [5] Therefore, the majority of these fractures are a result of a fall while standing.
Epidemiology
The recent increase in distal radius fractures in patients of all ages is attributed to a variety of factors. Fractures in pediatric patients are most common around the time of puberty, with boys tending to suffer the injury more often than girls. The young adult population (ages 19 to 49) is the least affected by Barton fractures, with a greater predilection for males than females. In the elderly, women are more likely to be diagnosed with a Barton fracture than their male counterparts due to higher rates of osteoporosis. Volar Barton fractures make about 1.3 percent of distal radius fractures.[6]
Pathophysiology
A Barton fracture is a compression injury with a marginal shearing fracture of the distal radius. The most common cause of this injury is a fall on an outstretched, pronated wrist. The compressive force travels from the hand and wrist through the articular surface of the radius, resulting in a triangular portion of the distal radius being displaced dorsally along with the carpus.[7] Multiple stabilizing structures help to maintain the relationship between the radius and the carpal bones, including the extrinsic radiocarpal ligaments, the joint capsule, and the scaphoid and lunate fossa of the radius. The associated injuries are distal radioulnar joint disruption, Triangular Fibrocartilage Complex (TFCC) tear, scapholunate ligament injury, and volar intercalated segment instability.[8][9]
History and Physical
Patients with Barton fractures will typically present to the urgent care or emergency department with acute wrist pain, swelling, and deformity following a recent trauma. The examination may reveal ecchymosis, tenderness, and swollen wrist joint. The range of motion of the wrist joint will be limited due to pain. To rule out associated injuries and complications, the distal neurovascular status must be assessed. A younger patient commonly will describe a sporting injury or motor vehicle accident, while older patients may report a lower energy trauma such as a fall from standing. The patient typically describes a history of fall on an outstretched hand. The type of fracture depends upon the position of the wrist joint during impact e.g. volar shear fractures occur when the wrist is in palmar flexion, while dorsiflexion leads to dorsal shear fractures.
Evaluation
Initial evaluation of the Barton fracture begins with radiographs of the wrist, consisting of at least frontal and lateral views. Oblique views of the wrist often are obtained and may assist in the diagnosis. The radial height inclination, ulnar variance, and articular step are measured on an anteroposterior radiograph. Volar tilt, coronal split, and comminution are visible on lateral radiographs. The radius is 23 degrees inclined in the coronal plane and has an 11 degrees tilt in the sagittal plane. The radius height is approximately 11 mm and ulnar variance ranges from -2mm to +2mm. A radiograph of the unaffected side can be used as a benchmark to see how well all values have returned to normal ranges. An important prognostic factor for wrist arthritis and pain-free range of motion is articular congruity of the distal radius.[10] CT can be used to better evaluate anatomic detail or if radiographs are unclear. It provides information regarding the level of comminution, occult fractures, and the assessment of fracture union. MRI is not the first modality of investigation for acute settings, however, it may be utilized to evaluate for associated ligamentous or soft tissue injuries.[11]
Treatment / Management
The overall goal in the evaluation and treatment of these patients presenting with Barton fractures is to obtain sufficient pain-free motion which will allow the patient to return to their usual activities while at the same time minimizing their risk for developing early-onset osteoarthritis that will lead to disability. Traditionally, the treatment of distal radius fractures is by closed reduction and immobilization in a splint or cast, this has been and remains the treatment of choice in nondisplaced and stable distal radial fractures. [12] Due to the nature of Barton fractures and the implied dorsal displacement of the fracture, many fractures will fail conservative management; therefore, surgical treatment is the preferred option.[13][14]
The following key radiographic signs should alert the surgeon that the fracture is unstable and indicate closed reduction will be insufficient:
- Dorsal comminution greater than 50% of the lateral width of the distal radius,
- Palmar metaphyseal comminution,
- Initial dorsal tilt greater than 20 degrees, initial fragment displacement greater than 1 cm,
- Radial shortening of more than 5 mm,
- Intra-articular disruption or Barton's fracture
- An associated ulna fracture, and
- Severe osteoporosis.
Most Barton fractures are unstable and operative fixation is required. The undisplaced fractures can be managed with immobilization in a cast. While applying the cast, the wrist is slightly volar flexed in volar barton fracture and dorsiflexed in dorsal barton fracture.[15] The exceedingly fragile nature of this injury predisposes to displacement in a cast, therefore even undisplaced fractures need to be constantly monitored radiographically until union. Those who elect to forgo surgery are treated with reduction and immobilization for at least six weeks. [16]When electing to treat these patients with either operative or nonoperative therapy, it is essential to include the patient in the management decision, clearly allowing them to establish and understand the pre-management expectations. Open reduction and internal fixation are recommended for Barton's fracture due to the unstable fracture pattern and the strong pull of flexor tendons.
Volar Approach for Volar Barton's Fracture
A Volar T-buttress plate is used for the fixation of volar rim fracture. In contrast to the principle of fixation, the plate is applied on the volar surface rather than the tensile/dorsal surface due to less soft tissue irritation.[15] Henry's approach or trans-FCR approach is used to approach volar barton fracture. Henry's approach includes the interval between the flexor carpi radialis tendon and the radial artery, while the fracture is approached through the tendon sheath of the flexor carpi radialis tendon in the trans-FCR approach. The dissection is done radial to flexor carpi radialis to prevent injury to the palmar cutaneous branch of the median nerve. Flexor carpi radialis, the flexor digitorum superficialis, and profundus tendons are retracted towards the ulnar side. in order to prevent the possible denervation of the muscle, avoid radial retraction of the flexor pollicis longus. The volar radiocarpal ligaments that stabilize the wrist are preserved as the pronator quadratus is lifted off from the radial side.[17] Every effort should be made to stabilize the volar lunate facet fragment to prevent carpal subluxation and instability. This may require an extension of the volar incision that incorporates a carpal tunnel release or a separate ulnar incision is made to stabilize the lunate facet fragment.[18] A volar barton's fracture with dorsal rim fracture of the distal radius requires a well-contoured volar plate to prevent dorsal angulation of distal radius articular surface and poor wrist functional outcome.[8] Following surgery, the wrist is immobilized in a splint for five to ten days and then active wrist mobility is started.
Dorsal Approach for Dorsal Barton's Fracture
A preoperative CT scan is required for the evaluation of fracture patterns and the level of comminution. The dorsal approach is used for dorsal barton and fragment-specific fixation of distal radius fracture through the 3rd dorsal compartment. A 5-6 cm longitudinal incision is made along the lister tubercle. The extensor pollicis longus tendon is retracted radially after incising the roof of the 3rd dorsal compartment. Subperiosteal dissection is done in the 2nd and 4th dorsal compartments to expose the distal radius. [19] To prevent postoperative wrist pain, the posterior interosseous nerve is sacrificed proximally or preserved by dissecting it in a subperiosteal fashion in the 4th compartment.[20] In order to prevent radiocarpal instability, the scapholunate ligament is preserved while performing a dorsal wrist capsulotomy. The dorsal capsule is incised vertically along the skin incision. The dorsal barton fracture is reduced with traction and dorsiflexion maneuver. The dorsal buttress plate or locking plate is used to stabilize the fracture and maintain articular congruity.
K-wires have been used along with a spanning external fixator for barton fracture with a success rate of 80-90%.[21] The disadvantages of K-wire fixation are mal-reduction, tendon penetration of wires, and pin site infection. The overall success rate with the plating system is 90-95% however it is associated with wound-related complications. The long-term outcome depends upon the level of fracture comminution, joint arthrosis, and range of motion wrist exercises postoperatively.[3] If volar Barton fractures do not include carpal subluxation, closed reduction with the cast is advised. However, a 2mm articular step warrants operative fixation.[16]
Differential Diagnosis
Various distal radius fractures can have similar clinical presentations and may appear radiographically similar to the Barton fracture.
- The reverse Barton fracture is an articular fracture of the distal radius with dislocation in which the articular surface of the radius remains in contact with the carpus; however, the reverse type involves the volar portion rather than the dorsal aspect of the radius.
- The Colles fracture is a fracture of the distal radius with dorsal angulation/displacement; the key differentiating finding is the lack of intraarticular extension.
- The Smith fracture can be thought of as a reverse Colles fracture with volar rather than dorsal angulation.
- The die-punch fracture is a fracture of the articular surface of the radius with depression of the lunate facet.
- The Chauffer’s fracture is an avulsion fracture of the radial styloid.
Prognosis
Intraarticular fractures of the distal radius, including the Barton fracture, have a higher risk of post-traumatic arthritis than extraarticular fractures. Any articular step-off of greater than 2 millimeters can increase the likelihood of post-traumatic arthritis by almost 100%. However, most studies indicate this does not significantly affect livelihood. The population with the worst prognosis is the elderly, who tend to have higher mortality than other patients due to the limitations to activities of daily living.[23]
Complications
The treating/managing physician should be aware of the multiple injuries that can occur in association with Barton fractures and other fractures of the distal radius including tears of the triangular fibrocartilage (TFCC), traumatic acute carpal tunnel syndrome, development of compartment syndrome in the forearm at time of initial presentation, and development of complex regional pain syndrome (CRPS) in the subsequent weeks and months following the initial treatment. Range-of-motion exercises for the wrist and fingers should be started as soon as possible to prevent wrist stiffness. [24]
These complications can occur following Barton's fracture: Carpal tunnel syndrome, radial nerve compression, ulnar nerve injury, complex regional pain syndrome (CRPS), post-traumatic arthritis, radiocarpal instability, malunion, distal radioulnar joint instability, flexor tendon adhesions, tendon rupture, tendinitis, tenosynovitis, trigger finger, Dupuytren's contracture, and compartment syndrome.
Surgical site infection, loss of fracture reduction, iatrogenic fracture, tendon injuries, neurovascular compromise, compartment syndrome, painful implant, and wrist stiffness are the common complications postoperatively.[25]
Postoperative and Rehabilitation Care
The main goal of rehabilitation is to achieve pain-free full range of motion of the wrist joint. Rehabilitation and physiotherapy are continued during three stages of treatment: splinting, mobilization, and endurance training. Full mobilization of fingers, elbow, and shoulder is advised even during splinting phase to prevent stiffness.[26] The immobilization period ranges from three weeks to six weeks. Shorter immobilization(3 weeks) leads to improved short-term outcomes while long-term results are comparable to that of 6 weeks of splinting.[27] The objectives of pain and edema management, along with improved wrist mobility are continued during the mobilization phase. Delayed immobilization leads to increased increased wrist stiffness and frequent visits to therapists. After the active and passive range of motion exercises, strengthening exercises are carried out by the therapist.[28]
Pearls and Other Issues
- The Barton fracture is a fracture of the distal radius which extends through the dorsal aspect of the articular surface with associated dislocation of the radiocarpal joint. However, since there is no disruption of the radiocarpal ligaments, the articular surface of the fractured distal radius remains in contact with the proximal carpal row.
- Radiography is the primary imaging modality in diagnosis, although CT and MRI have a role as well.
- In the younger population, males suffer the injury more often than females, typically following high-energy trauma.
- In the elderly, more women are diagnosed with Barton fractures after a fall from standing or other low-energy trauma.
- Most Barton fractures are treated surgically, though recent studies have shown little significant difference in operative versus nonoperative management in the elderly.
Enhancing Healthcare Team Outcomes
Patients with a Barton fracture often first present to the emergency room; hence the emergency department physician and the nurse practitioner are often the first to make the diagnosis. It is important to know that Barton fracture is frequently associated with other injuries and hence a thorough physical exam is necessary. Because conservative treatment of Barton fracture is not always satisfactory, it is important to consult with the orthopedic surgeon. Most Barton fractures are treated surgically, though recent studies have shown little significant difference in operative versus nonoperative management in the elderly. After surgery, the outcomes in young patients are good but in elderly people, the recovery can be prolonged. All patients need some type of rehabilitation after the fracture has healed. [6][29] [Level 5]
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Disclosure: Joel Szymanski declares no relevant financial relationships with ineligible companies.
Disclosure: Russell Reeves declares no relevant financial relationships with ineligible companies.
Disclosure: Muhammad Taqi declares no relevant financial relationships with ineligible companies.
Disclosure: Kevin Carter declares no relevant financial relationships with ineligible companies.
- Continuing Education Activity
- Introduction
- Etiology
- Epidemiology
- Pathophysiology
- History and Physical
- Evaluation
- Treatment / Management
- Differential Diagnosis
- Staging
- Prognosis
- Complications
- Postoperative and Rehabilitation Care
- Pearls and Other Issues
- Enhancing Healthcare Team Outcomes
- Review Questions
- References
- Ligament-Sparing Volar Radiocarpal Arthrotomy During Distal Radius Fracture Repair: Biomechanical Implications on Wrist Stability in a Cadaveric Model.[J Hand Surg Am. 2024]Ligament-Sparing Volar Radiocarpal Arthrotomy During Distal Radius Fracture Repair: Biomechanical Implications on Wrist Stability in a Cadaveric Model.Douleh DG, Baldini T, Carry P, Rogers M, Leversedge FJ, Lauder A. J Hand Surg Am. 2024 Jun; 49(6):613.e1-613.e10. Epub 2022 Oct 28.
- Dorsal Wrist Extrinsic Carpal Ligament Injury Exacerbates Volar Radiocarpal Instability After Intra-Articular Distal Radius Fracture.[Hand (N Y). 2021]Dorsal Wrist Extrinsic Carpal Ligament Injury Exacerbates Volar Radiocarpal Instability After Intra-Articular Distal Radius Fracture.Bui CNH, Rafijah GH, Lin CC, Kahn T, Peterson A, Lee TQ. Hand (N Y). 2021 Mar; 16(2):193-200. Epub 2019 Jun 3.
- Safety of Releasing the Volar Capsule During Open Treatment of Distal Radius Fractures: An Analysis of the Extrinsic Radiocarpal Ligaments' Contribution to Radiocarpal Stability.[J Hand Surg Am. 2020]Safety of Releasing the Volar Capsule During Open Treatment of Distal Radius Fractures: An Analysis of the Extrinsic Radiocarpal Ligaments' Contribution to Radiocarpal Stability.Suazo Gladwin LA, Douglass N, Behn AW, Thio T, Ruch DS, Kamal RN. J Hand Surg Am. 2020 Nov; 45(11):1089.e1-1089.e16. Epub 2020 Jul 31.
- Review The Volar Intra-Articular Extended Window Approach for Intra-Articular Distal Radius Fractures.[J Hand Surg Am. 2023]Review The Volar Intra-Articular Extended Window Approach for Intra-Articular Distal Radius Fractures.Kamal RN, Ostergaard PJ, Shapiro LM. J Hand Surg Am. 2023 May; 48(5):516.e1-516.e5. Epub 2023 Feb 21.
- Review Volar-Ulnar Approach for Fixation of the Volar Lunate Facet Fragment in Distal Radius Fractures: A Technical Tip.[J Hand Surg Am. 2016]Review Volar-Ulnar Approach for Fixation of the Volar Lunate Facet Fragment in Distal Radius Fractures: A Technical Tip.Tordjman D, Hinds RM, Ayalon O, Yang SS, Capo JT. J Hand Surg Am. 2016 Dec; 41(12):e491-e500.
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