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Radial head fractures in young, active patients

Radiusköpfchenfrakturen bei jungen, aktiven Patienten

Abstract

The radial head is an important stabilizer of the elbow joint. Radial head fractures are commonly associated with additional injuries to the ligamentous structures of the elbow and can significantly compromise elbow stability. Young patients with radial head fractures are more likely to be male and present after a high-energy mechanism of injury. While not perfect, the Mason classification is the most commonly used classification system and can help to guide the management of radial head fractures. Type I fractures are nondisplaced or minimally displaced (less than 2 mm) and are treated nonoperatively with early mobilization. Type II fractures, which are displaced 2–5 mm, can be treated nonoperatively or with open reduction and internal fixation (ORIF). Type III fractures are comminuted and are most often treated with ORIF or with radial head arthroplasty (RHA). Treatment of fractures with an associated elbow dislocation (Mason type IV) is also with ORIF or RHA depending on the degree of comminution. For all of these injuries, assessment and treatment of associated ligamentous injuries are necessary in conjunction with treatment of the bony injury. Despite a significant body of literature available on radial head fractures, there is controversy regarding the optimal management of type II, III, and IV fractures, especially in young, active patients. Common complications following radial head fractures include stiffness, instability, and posttraumatic osteoarthritis; as such, these injuries can lead to significant disability in young, active patients if not managed appropriately.

Zusammenfassung

Das Radiusköpfchen stellt einen wichtigen Stabilisierungsfaktor des Ellenbogengelenks dar. Radiusköpfchenfrakturen gehen häufig mit zusätzlichen Verletzungen der ligamentären Strukturen des Ellenbogens einher und können die Ellenbogenstabilität erheblich beeinträchtigen. Bei jungen Patienten mit Radiusköpfchenfrakturen handelt es sich eher um männliche Patienten, die ein Hochenergietrauma erlitten haben. Die Mason-Klassifikation ist zwar nicht perfekt, aber das am meisten verbreitete Klassifikationssystem und kann zur Auswahl der geeigneten Versorgung von Radiusköpfchenfrakturen beitragen. Typ-I-Frakturen sind nichtdisloziert oder minimal disloziert (weniger als 2 mm) und werden nichtoperativ mit Frühmobilisation behandelt. Typ-II-Frakturen sind 2–5 mm disloziert und können nichtoperativ oder mittels offener Reposition und interner Fixation (ORIF) versorgt werden. Typ-III-Frakturen sind Trümmerfrakturen und werden meist mittels ORIF oder Radiusköpfchenarthroplastik (RHA) behandelt. Die Therapie von Frakturen mit einer begleitenden Ellenbogendislokation (Mason-Typ IV) erfolgt ebenfalls mittels ORIF oder RHA, je nach Ausmaß der Zertrümmerung. Bei all diesen Läsionen ist die Untersuchung und Behandlung begleitender ligamentärer Verletzungen in Zusammenhang mit der Therapie der knöchernen Verletzung erforderlich. Obwohl es einen wesentlichen Bestand an Literatur zur Radiusköpfchenfraktur gibt, besteht eine Kontroverse in Bezug auf die optimale Behandlung der Frakturen von Typ II, III und IV, insbesondere bei jungen, aktiven Patienten. Zu den häufigen Komplikationen nach Radiusköpfchenfraktur gehörten Steifheit, Instabilität und posttraumatische Arthrose; diese Läsionen können schon für sich genommen zu einer wesentlichen Behinderung junger, aktiver Patienten führen, wenn sie nicht in geeigneter Weise behandelt werden.

A fully functional upper extremity depends on the stability of the elbow joint. Fractures can compromise this stability and radial head fractures account for 30% of elbow fractures [1]. The incidence of radial head fractures has a bimodal pattern, with a peak at 37 years for men and 52 for women (Fig. 1; [1,2,3]). The mechanism of injury is most commonly a fall onto an outstretched hand; however, any mechanism applying an axial force along the long axis of the radius can be causative. Women tend to sustain lower-energy injuries, whereas males more often sustain higher-energy injuries [2]. Disruption of the important ligamentous stabilizers of the elbow joint are also common with radial head fractures.

Fig. 1
figure1

Incidence of radial head fractures. The age of peak incidence for radial head fractures for males (blue line) and females (red line). (With kind permission from [2])

“A fully functional upper extremity depends on the stability of the elbow joint”

Although extensively studied, treatment of radial head fractures remains controversial particularly in younger patients with more severe injuries [4]. Pain, stiffness, and limitations in range of motion (ROM) are associated with both operative and nonoperative treatment. As a result, these injuries can lead to significant disability in young, active patients if not managed appropriately.

Anatomy

The elbow joint is made up of three articulations: ulnohumeral, radiocapitellar, and proximal radioulnar. Overall, 60% of the load transferred across the elbow joint is transmitted through the radiocapitellar joint [1]. The radial head is a secondary restraint to valgus forces on the elbow and provides longitudinal stability, preventing proximal migration of the radius. The concave radial head articulates with the convex capitellum and the medial rim of the radial head articulates with the lesser sigmoid notch of the ulna.

Articular cartilage covers the radial head in a 280-degree arc with the remaining 80 degrees representing the non-articular posterolateral side. This non-articular “safe zone” can be identified as the region between two longitudinal lines drawn from the radial styloid and Lister’s tubercle [1, 3]. When using plate fixation, the plate should be placed in this safe zone to prevent impingement on the ulna during forearm pronation and supination.

Given that ligamentous injury is common with radial head fractures, understanding the ligaments of the elbow and their contributions to stability is necessary for successful outcomes. On the lateral side of the elbow the lateral ulnar collateral ligament (LUCL) is the primary restraint to varus and external rotation forces and prevents posterolateral rotatory instability. Similarly, on the medial side the anterior bundle of the medial collateral ligament (MCL) is the primary restraint to valgus forces on the elbow, the posterior bundle, and the transverse bundle [1, 5].

Patient presentation and evaluation

Young, active patients with radial head fractures most commonly present after a high-energy fall onto an outstretched arm with the forearm in pronation and the elbow in slight flexion. Associated injuries occur in up to 92% of radial head fractures [6]. Rhyou et al. showed that isolated radial head fractures are often associated with MCL injuries, while combined radial head and coronoid fractures are more likely to accompany LCL injuries [5]. As such, a thorough examination of the injured upper extremity must be performed. Elbow ROM in terms of flexion, extension, pronation, and supination should be evaluated looking for any mechanical blocks to motion. Hematoma in the radiocapitellar joint can be aspirated and local anesthetic may be injected to alleviate pain and facilitate assessment of whether ROM limitations are due to a true mechanical block. Elbow stability should be evaluated with varus and valgus stresses, as well as examined for posterolateral rotatory instability. That said, discomfort despite attempted aspirations and injections will frequently limit the accuracy of the physical examination in the clinic. Instability is often identified intraoperatively, and the surgeon must be prepared to perform ligamentous repair, reconstruction, or in some cases place a dynamic external fixator.

Imaging

Initial imaging studies to assess for a radial head fracture include anteroposterior (AP), lateral, oblique, and radiocapitellar (Greenspan) radiographs of the elbow (Fig. 2). If no displaced fracture is present, an anterior or posterior fat pad sign seen on a lateral radiograph can indicate a non-displaced radial head fracture [7]. Additional radiographs of the ipsilateral extremity as well as of other extremities should be obtained if the physical examination warrants this. Pain on palpation of the forearm or distal radial ulnar joint (DRUJ) raises concern for Essex–Lopresti type injuries (radial head fracture, interosseous membrane injury, and DRUJ injury) where the radial head is the only structure preventing proximal migration of the radius [1].

Fig. 2
figure2

Radiographic evaluation for radial head fractures. a Anteroposterior, b lateral, and c radiocapitellar views of the elbow. (With kind permission from [29])

Computed tomography (CT) of the elbow with three-dimensional (3D) reconstructions can be obtained to better delineate the fracture pattern and assist with preoperative planning. Magnetic resonance imaging (MRI) has been used to evaluate for soft tissue injury, but detection of collateral ligament and Essex–Lopresti injuries acutely remains flawed [8]. It should be emphasized that radial head fractures are commonly associated with significant soft tissue injury, even in nondisplaced fractures, and can thus be viewed as “osteoligamentous” injuries [1].

Classification

The Mason classification with modifications by Hotchkiss, Johnston, Broberg, and Morrey is the most widely used classification system (Fig. 3; [9]). Type I radial head fractures are nondisplaced or displaced less than 2 mm. Type II fractures are displaced more than 2 mm or have a fragment size greater than 30% of the articular surface and may block mechanical motion. Type III fractures are comminuted. Type IV fractures are associated with an elbow dislocation. Despite its widespread use, the Mason classification has poor-to-moderate intra- and interobserver reliability; however, the associated modifications and use of CT and MRI can significantly improve reliability [1, 3, 10].

Fig. 3
figure3

Mason classification. a Type I: nondisplaced. b Type II: partial articular fractures displaced 2–5 mm. c Type III: comminuted fractures. d Type IV: fracture with elbow dislocation. (With kind permission from [30])

An additional classification system that is primarily used for research purposes is the AO classification of proximal radius fractures. Fractures of the proximal radius are coded as 2R1. 2R1A describes extra-articular fractures, 2R1B describes partial articular fractures, and 2R1C describes complete articular fractures. Further numbers can be added to denote the amount of comminution present.

Treatment

Mason I

There is agreement that for Mason I fractures, nonoperative treatment results in excellent outcomes and is the treatment of choice [1, 7, 11]. Successful nonoperative treatment requires early mobilization of the elbow to avoid stiffness. In a systematic review of Mason I fractures, a grade A recommendation was made for nonoperative treatment consisting of 48 h of sling immobilization followed by an aggressive mobilization protocol; the authors found that the 48‑h immobilization avoided increased pain seen with immediate mobilization and reduced the stiffness seen with longer immobilization [7].

“Successful nonoperative treatment requires early mobilization of the elbow”

Traditionally, physical therapy is part of nonoperative treatment protocols. However, Egol et al. reported better outcomes with the use of a home exercise program compared with formal biweekly physical therapy [12]. The home exercise program from this study involved active forearm and elbow stretches, and exercises for wrist flexion and elbow pronation/supination all performed twice daily [12]. Eliminating biweekly physical therapy saves time, travel, and money for patients [12]. Especially for young, active patients who should be able to comply, we suggest using a self-directed home exercise program due to the aforementioned benefits.

Mason II

There is considerable debate over the ideal treatment of Mason II fractures. A mechanical block to rotation on examination is the only absolute indication for surgery [1, 13]. While pooled data show that there may be benefits for open reduction internal fixation (ORIF), most studies show that outcomes following nonoperative treatment for type II fractures are very good and there is a lower risk of complications than with ORIF [11, 13, 14]. The main concern with nonoperative management is that there may be an increased risk of development of arthritic changes at the radiocapitellar joint with the over 2‑mm articular step-off [1].

In the only series to evaluate a cohort of young athletes with type II radial head fractures, good or excellent outcomes were found for nonoperative treatment with a mean follow-up of 3 years and all 52 athletes returned to high-demand sports activity at an average of 48 days [15]. The authors found at final follow-up that there was radiographic evidence of degenerative changes of the radiocapitellar joint in 11.5% of patients [15]. Regardless, this study demonstrates that for young, athletic patients with type II fractures, nonoperative treatment is a viable option that allows for quick, reliable return to activity.

Given the lack of a consensus regarding the superiority of ORIF or nonoperative treatment for type II fractures, shared decision-making with the patient is important. The potential increased risk of degenerative changes and reduced long-term function may influence the young, active patient to pursue operative treatment (Fig. 4). However, given that nonoperative management reliably produces good short- to mid-term outcomes and a quick return to activity, it remains a safe, reproducible, and often attractive option.

Fig. 4
figure4

Mason II radial head fracture treated with open reduction internal fixation (ORIF). Left to right: Lateral and anteroposterior radiographs. Computed tomography scan shows the articular step-off better. ORIF of the fracture along with lateral ulnar collateral ligament repair was performed. (With kind permission from [1])

Mason III–IV

Type III radial head fractures require surgery; however, there is controversy regarding the decision to attempt ORIF in an effort to save the native radial head, versus replacing the radial head, especially in younger patients. Owing to complications of secondary displacement, non-union, and avascular necrosis reported with ORIF of comminuted fractures, the standard of care is to perform radial head arthroplasty (RHA) for fractures with more than three fragments (Fig. 5; [1, 16]). The concern with RHA in young patients is that the long-term durability of these implants is unknown and there are uncertainties regarding the development of reciprocal degenerative changes of the capitellum because the circular implants do not perfectly recreate the elliptical anatomy of the radial head [17]. Radial head excision was previously considered an option; however, due to the risk of proximal migration of the radius and issues with elbow instability, this should not be considered a first-line treatment for active patients [8]. The management of type IV fractures generally depends on the level of comminution, but these are often comminuted similarly to type III fractures. It is of paramount importance to examine for and address ligamentous instability in all of these high-level fractures, but especially so in type IV fractures due to the associated dislocation. Ligamentous repairs are often necessary in conjunction with treatment of the radial head fracture itself.

Fig. 5
figure5

Mason IV radial head fracture treated with radial head arthroplasty (RHA). Left to right: anteroposterior and lateral radiographs show a comminuted fracture with elbow dislocation. Three-dimensional computed tomography reconstruction shows the comminution. RHA and ligamentous repairs were performed. (With kind permission from [1])

With the invention of radial head-specific, low-profile locking plates, there have been multiple recent studies showing that ORIF of highly comminuted fractures can be a viable option (Fig. 6; [16, 18, 19]). Gruszka et al. reported favorable outcomes in 35 patients undergoing ORIF for mostly four- or five-fragment radial head fractures with a 97% healing rate; however, 38% of patients required a secondary procedure, of which 32% included removal of hardware [16]. Similarly, in a study of 20 Mason III and IV fractures following ORIF, 17 patients were highly satisfied and ten achieved unrestricted ROM of the operative extremity [18].

Fig. 6
figure6

Mason III fracture treated with open reduction internal fixation (ORIF). a Three-dimensional computed tomography (CT) reconstruction. Sagittal cuts of the CT show articular comminution (b) and coronoid fracture (c). d Cut from coronal CT. e,f ORIF with a low-profile, radial head-specific locking plate was performed. g,h Anteroposterior and lateral radiographs after hardware removal show an intact articular surface. (With kind permission from [16])

Despite the improvements in technology for ORIF, RHA has increased in popularity over the past decade. There is, however, significant regional variability as a recent study showed that surgeons from North America are ten times more likely to recommend RHA over ORIF for comminuted fractures, compared with European surgeons [20]. The age of the patient has been shown to factor into surgical decision-making as well, with ORIF rates decreasing and RHA rates increasing with age [21].

Among patients of all ages, there remains no consensus regarding ORIF versus RHA for Mason III and IV fractures. In a recent systematic review, Meacher et al. concluded that based on the only two available randomized controlled trials that met their criteria, RHA may have benefits over ORIF, but the evidence is weak [17]. Vannabouathong et al. performed a similar meta-analysis and concluded that RHA resulted in better outcomes and fewer complications at 2 years following surgery [22]. Watters et al. showed equivocal outcome scores and ROM among patients undergoing RHA and ORIF for terrible triad injuries, but at 18 months found that nearly 37% of the RHA patients had radiographic signs of arthrosis compared with 0% in the ORIF group [23]. Additionally, Reinhart et al. reported on a large database study of over 7000 patients that showed ORIF was associated with a significantly higher rate of complications and overall cost of care when compared with RHA [24]. The lack of concordance in the findings of these different studies highlights why a consensus has not been reached.

The data for RHA in young, active patients are relatively limited and again there is no consensus. Among patients undergoing RHA for acute traumatic fractures, Duckworth et al. found that at 3 years, younger patients had a higher risk of implant excision [25]. Dunn et al. in a cohort of active military patients with an average age of 31 found excellent subjective outcomes following RHA and reported that 15 of 19 patients were able to return to active duty; however, there was a 47% complication rate (most common complications: 26% symptomatic heterotopic ossification, 21% neurologic sequelae, and 16% arthrofibrosis) and 63% of patients were unable to achieve pre-injury functional levels [26]. In a series of active, but older patients (mean age 49), Jung et al. again reported overall favorable subjective outcomes, but found a low return to sport rate of 53% following RHA and of those who were able to return to sport, 17% needed to change to a less demanding sport [27]. Lastly, in the only study to date comparing ORIF and RHA in young, active patients, Kusnezov et al. reported twice the complication rate and more reoperations after RHA in active duty military patients. However, there were no differences in functional outcomes and 90% of patients were able to return to active military duty [4]. Additionally, they found that associated coronoid fractures, LUCL injuries, and type IV injuries increased the risk of complications and reoperations, regardless of the surgical treatment chosen [4]. Ultimately, they concluded that ORIF and RHA are both viable options in young, active patients despite an increased risk of complications with RHA in this population [4].

Given the increased risk of complications, the possibility of capitellar erosion, and uncertainty regarding long-term outcomes of RHA in young, active patients, it seems advantageous to perform ORIF of the radial head if possible. With the availability of radial head-specific, low-profile locking plates, ORIF may be more likely than in the past to be successful in fractures with increased comminution relative to the conventional teaching of three fragments. However, priority must be given to recreating a stable elbow joint, and thus sometimes RHA will be necessary in this population and the data show that good outcomes can still be achieved.

Postoperative care

The duration of postoperative immobilization depends on both the strength of fixation and the stability of the elbow. Isolated Mason II fractures that undergo ORIF can be mobilized immediately [1]. More complex injuries can be splinted for up to 2 weeks; however, the splint should be removed intermittently for supervised physical therapy. If residual joint instability persists, or there are ligamentous repairs to protect, use of a hinged elbow brace can be helpful. In grossly unstable injuries, where adequate stability for early joint mobilization cannot be achieved in the OR, the surgeon should consider application of a dynamic external fixator.

Physical therapy is initiated within the first week to regain ROM and strengthen active stabilizers through active and active-assisted exercises. Forearm rotation should be performed with 90 degrees of elbow flexion to protect any collateral ligament repairs, and elbow extension exercises are performed with the forearm rotated appropriately to protect collateral repairs (LUCL protected in pronation, MCL protected in supination) or in neutral if both collaterals were involved [1]. Varus and valgus stress, resistive exercises, and weight-bearing are fully restricted for 6 weeks and are gradually permitted after that based on the surgeon’s preference.

“Physical therapy is initiated within the first week to regain range of motion”

Return-to-play criteria for recreational and/or competitive sports participation are not well-established following surgery for radial head fractures. The operative elbow should be compared with the nonoperative elbow with regard to stability, strength, and ROM and ultimately a joint decision should be made with input from both the patient and the surgeon. Generally, return to play should not be expected earlier than 3 months postoperatively for isolated Mason II fractures after ORIF and no sooner than 6 months for more complex injuries with associated soft tissue repairs.

Complications

Regardless of treatment, the most common complication is stiffness [28]. This is why it is important to work on elbow ROM early in the recovery process. In a large multicenter study, the next most common complications were instability and posttraumatic osteoarthritis, seen in 36.5 and 29.2% of cases, respectively [28]. As expected, recurrent instability was most common after treatment of type III and IV fractures. A large percentage of the patients who developed osteoarthritis were those with type II fractures treated nonoperatively, which is why it is important to counsel young patients regarding this risk if they are considering nonoperative treatment. Next most likely are complications from hardware including painful hardware, hardware restricting ROM, loss of fixation or hardware failure, and RHA prosthesis failure, dislocation, or loosening.

Practical conclusion

  • Radial head fractures can compromise elbow stability and should be viewed as “osteoligamentous” injuries due to their association with damage to the surrounding soft tissues. Both bony and soft tissue injuries must be addressed to restore stability to the elbow joint.

  • Conservative management should be pursued for type I injuries with an emphasis on early range of motion to prevent stiffness.

  • Type II fractures can generally be treated with either conservative management or open reduction internal fixation (ORIF), both provide good functional outcomes. However, young patients should be aware that there is potentially an increased risk of posttraumatic osteoarthritis with nonoperative treatment of type II fractures.

  • Controversy remains regarding best treatment for Mason III and IV injuries. While good outcomes in young, active patients are achievable with both ORIF and radial head arthroplasty, complication rates appear to be higher for arthroplasty in this population and newer radial head-specific plating systems likely allow for good outcomes with ORIF of fractures that have more fragments than the conventional limit of three.

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Correspondence to Christopher G. Larsen MD.

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A.S. Greenberg is a consultant for Arthrex and Medartis. C.G. Larsen and M.J. Fitzgerald declare that they have no competing interests.

For this article no studies with human participants or animals were performed by any of the authors. All studies performed were in accordance with the ethical standards indicated in each case.

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Larsen, C.G., Fitzgerald, M.J. & Greenberg, A.S. Radial head fractures in young, active patients. Obere Extremität 15, 251–259 (2020). https://doi.org/10.1007/s11678-020-00605-w

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Keywords

  • Elbow
  • Nonoperative treatment
  • Open fracture reduction
  • Radius fractures
  • Arthroplasty

Schlüsselwörter

  • Ellenbogen
  • Nichtoperative Behandlung
  • Offene Frakturreposition
  • Radiusfrakturen
  • Arthroplastik