CURRENT CONCEPTS REVIEW

 

Distal radius fractures: current concepts

 

 

Pududu A Rachuene^{I, *}; Frederick J du Toit^II; Gladwell Κ Tsolo^II; Sivesonke M Khanyile^III; Makgabo J Tladi^IV; Sikheto S Goleie^V

^IDepartment of Orthopaedics, Shoulder and Elbow Unit, Sefako Makgatho Health Sciences University, Dr George Mukhari Academic Hospital, Pretoria, South Africa
^IIDepartment of Orthopaedics, Sefako Makgatho Health Sciences University, Dr George Mukhari Academic Hospital, Pretoria, South Africa
^IIIDepartment of Orthopaedics, Female Trauma Unit, Sefako Makgatho Health Sciences University, Dr George Mukhari Academic Hospital, Pretoria, South Africa
^IVLouis Pasteur Private Hospital, Pretoria, South Africa
^VDepartment of Orthopaedics, Department of Hands and Microsurgery, Sefako Makgatho Health Sciences University, Dr George Mukhari Academic Hospital, Pretoria, South Africa

 

 

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ABSTRACT

Distal radius fractures (DRFs) are commonly encountered in the elderly population, secondary to low-energy injury mechanisms. In the younger population, DRFs are mainly secondary to high-energy trauma. Stable DRFs can be treated conservatively. However, in the elderly population group, DRFs are often unstable and are likely to benefit from surgical intervention. They are often compounded by comorbid medical conditions requiring optimisation. When treating the elderly group, one should be aware of sarcopaenia, as this may have a bearing on return to function. Recent literature reports an increasing trend in the surgical management of these fractures. Current classification systems fail to consistently guide the management of these fractures. Although evidence is still limited in guiding decision-making in the treatment of these fractures, one should consider the economic implications of prolonged immobilisation in young patients in addition to defined indications for surgery. Improvement in implants allows safe dorsal fixation in patients with dorsal comminution, with low complication rates reported. This narrative review summarises current trends and the body of evidence.
Level of evidence: Level 5

Keywords: distal radius, fracture management, osteoporosis

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Introduction

Having noted a trend of steady increase in life expectancy globally, the World Health Organization (WHO) declared the years 2020 to 2030 as a decade of healthy ageing. The main aim of this declaration is to develop and maintain the functional ability that enables the wellbeing of the elderly population. Most people over the age of 60 years live in low- to middle-income countries.¹ In South Africa, as of mid-2020, the estimated life expectancy was 68.5 and 62.5 years for females and males respectively, showing a steady annual increase.² Distal radius fractures (DRFs) are the second most common fragility fracture.³ About 1.5% of the patients treated in the emergency unit will present with DRFs, of which 5-17% are due to low-energy injury mechanisms in osteoporotic patients.^4-6 In an epidemiological review of the Swedish registry, Rundgren et al. noted a higher prevalence of DRFs in females over the age of 50 years compared to males of the same age.⁷ The incidence of DRFs in young adults is low, and usually follows high-energy trauma or sports-related injuries, often presenting with complex fracture patterns.^8-10

 

Economic burden

More reconstruction options are available for the treatment of these injuries, each with cost implications. A recent review of a commercial claims database in the United States found conservative management to remain the treatment of choice throughout various demographic groups.¹¹ More recent literature reported a shift towards surgical intervention in these fractures.¹²

Mauck and Swigler reported an incidence of 634 000 DRFs annually in the American elderly population, with a high financial burden ranging from 385 to 535 million US dollars annually.⁴ Comparing treatment options for DRFs in adults from the Medicare dataset, Shauver et al. found the cost of surgery to be almost twice the cost of closed reduction and casting. Among young adults, an additional financial burden applies in the form of 'loss of productivity' due to the inability to perform their employment responsibilities.¹³

 

Historical background

Abraham Colles noted the deformities in patients he treated for DRFs in 1814, decades before X-rays were available. He reported good functional outcomes following closed reduction and a splintage with a 'narrow wooden-splint'.¹⁴ With the advancement in radiological investigations, fixation methods and arthroscopic skills, the understanding and management of these injuries is evolving from mostly conservative treatment methods to advanced fracture fixation methods, arthroscopic-assisted surgery and arthroplasty procedures.^15,16

 

Anatomic considerations

The distal radius is functionally made up of three columns formed by osteo-ligamentous structures; it rests on a pedestal and transmits 80% of the axial load through the wrist (Figure 1).¹⁷

The radial column

The radial column consists of the radial styloid and the scaphoid fossa, the insertion of the brachioradialis tendon, the long radiolunate ligament and radio-scapho-capitate ligament. This column serves as a radial buttress for the carpal bones during wrist ulnar deviation and weight bearing.^4,18 This column is often spared in patients with injuries secondary to axial forces. The brachioradialis is responsible for radial deviation, tilt and loss of radial height in these fractures.¹⁸

Intermediate column

The intermediate column is made up of the lunate facet and sigmoid notch and serves as the load transmission column.¹⁸ The ligamentous structures are the short radiolunate and volar distal radioulnar ligaments attached to the volar rim fragment; the dorsal radiocarpal ligament attached on the dorsal wall; and the dorsal distal radioulnar ligament attached to the dorsal ulnar corner. Fractures of the dorsal wall, volar rims, intra-articular fragments and dorsal ulnar corner form part of the intermediate column fractures.¹⁷ The dorsal wall provides functional stability against dorsal carpal subluxation. Shear force, axial loads and bending mechanisms can result in fractures of this dorsal wall.¹⁸ Fractures of the ulnar corner and more than 10 mm radial height loss are associated with unstable distal radioulnar joint (DRUJ) and triangular fibrocartilaginous complex (TFCC) injuries.^19,20

Reduction of the articular fragment is important for the restoration of the lunate facet. The lunate-lunate facet ratio (LLFR), measured on the lateral view, can help to determine the degree of articular separation.⁴ Articular surface congruency is best assessed with Medoff's teardrop angle (TDA), formed by a line through the central axis of the teardrop and a line in the centre of the distal radius where normal is 68° on the lateral view plain X-rays.²¹

The pedestal

The pedestal is the metadiaphyseal segment, immediately proximal to the radial and intermediate columns. Fractures extending into the pedestal are seen in high-energy injuries.^4,17

 

Evaluation

Clinical evaluation

Clinical examination should include a neurovascular assessment. Careful assessment of the median nerve is important, especially if there is a complaint of paraesthesia or numbness. This may indicate acute carpal tunnel syndrome (CTS). Acute CTS has been reported in 5.4-8.6% of patients with DRFs. It may develop rapidly, and the diagnosis is made by establishing the presence of severe paraesthesia in the median nerve distribution and sensory testing with two-point discrimination testing and Semmes-Weinstein monofilament testing.^22,23 Skin puncture is common in elderly patients with thin soft tissues. Care must be taken to avoid shearing of these tissues, especially during closed reductions.²⁴

Evaluation of elderly patients with DRFs should include assessment of the muscle mass. The Asian Working Group for Sarcopenia recommends the evaluation of hand grip strength and gait speed to diagnose sarcopaenia.²⁵ The presence of sarcopaenia has been reported to be prevalent in elderly patients with DRFs and it is closely associated with osteoporosis. Roh et al. reported 34% of men and 27% of women over the age of 50 years had sarcopaenia in a review of 264 patients with DRFs.²⁶ The presence of sarcopaenia is associated with poor functional recovery after DRF surgery.²⁷

Radiographic evaluation

A minimum of posteroanterior (PA) and lateral view plain X-rays is mandatory for the initial fracture evaluation.⁴ An additional 45° pronated oblique view can be added if deemed necessary. This view is helpful with profiling the dorsal ulnar cortex and lends insight into this biomechanically important region.⁹

Computed tomography scan

Coronal and axial computed tomography (CT) images with 2 mm slices provide a detailed view for fracture configuration, in occult or complex fractures as well as an assessment of the reduction.²⁸ In a study on the utility of radiographs, two-dimensional (2D) CT scans and three-dimensional (3D) CT scans on 30 DRFs, Harness et al. found 3D CT scans to be highly reliable and accurate over other studies and influenced treatment recommendations.²⁹ A CT scan should be considered in patients undergoing open reduction and internal fixation (ORIF) or when information about comminution and joint depression is needed.³⁰

 

Classifications

Most DRF classification systems are descriptive in nature and fail to guide on management. The McMurty and Jupiter as well as the Frykman, Melone and Mayo classification systems focus on the amount of articular involvement, whereas those by Gartland and Werley, and Older and Jenkins emphasise the amount of comminution.³¹ The AO classification lacks interobserver reliability and is mainly used for research and documentation.^4,32-34 The IDEAL classification³⁵ is a five-factor mnemonic used to classify DRFs into three broad groups which could predict stability, guide management and prognosticate. Validation and reproducibility are yet to be confirmed. No classification has been proven to be superior in terms of determining prognosis or guiding management.^4,31,35 Table I shows a summary of the results of selected studies evaluating inter-rater reliability of the commonly used classification systems.

 

Management of distal radius fractures

Decision-making

The aim of treating DRFs should be to restore wrist anatomical alignment and function. Important factors to consider in decision-making are patient's age, hand dominance, fracture pattern and radiographic parameters.^3,4,40,41 Decision on treatment should be tailored based on patient-specific factors.⁴²

Being able to predict fracture instability and loss of reduction remains the greatest challenge to treating surgeons. A Cochrane review of 60 DRFs in elderly patients managed with closed reduction found loss of reduction to be at a rate of 88%, of which 75% occurred within one week.³³

In 1989, Lafontaine et al. proposed that unstable fractures are likely to occur in patients aged 60 years and above and a fracture with greater than 20° dorsal angulation, dorsal comminution, associated ulnar fracture and intra-articular involvement.⁴³ These findings have been supported by other authors. Mackenney et al. prospectively reviewed 4 000 DRFs over a 5.5-year period with the aim of predicting early and late fracture instability and resultant fracture malunion. They found advanced patient age, fracture comminution and alteration in ulnar variance to be significant predictive factors of loss of reduction.⁴⁴ Similarly, a more recent systematic review and meta-analysis identified dorsal fracture comminution and female patients aged over 60 years to be significant predictive factors of fracture instability.⁴⁵

 

Treatment methods

Non-surgical treatment

Closed reduction and cast immobilisation remain an acceptable treatment modality for stable fractures with reported good results in elderly patients even in the presence of intra-articular involvement.⁴⁶ There was no difference in failure rate or final position at five weeks when the fracture was treated with finger trap traction or manipulation.⁴⁷ Appropriate splintage should be used. Figure 2 shows X-rays of a patient with successful closed reduction and below-elbow cast immobilisation. There is limited evidence on the usage of above-elbow immobilisation compared to below-elbow immobilisation.⁴⁸

Fracture reduction quality can be assessed with X-rays in a cast. Dailey et al. found no difference between the usage of a mini C-arm and taking radiographs in an orthosis when measuring the quality of reductions.⁴⁹ There is a lack of reliable evidence for radiographic evaluation of DRFs treated with closed reduction in the literature. The American Academy of Orthopedic Surgeons (AAOS) recommends weekly X-rays for the first three weeks and subsequent X-rays to be taken at six weeks to monitor alignment.⁴⁸ The results of closed reduction and cast immobilisation were reported to be comparable to those of patients treated surgically for displaced DRFs in a randomised controlled trial of 100 patients aged over 65 years at 12 months follow-up.⁵⁰ In the young active population, one should remember that a displacement of the fracture in a cast will delay the return to work or sporting activities.

Closed reduction and percutaneous pinning

Stable extra-articular fractures can be treated with closed reduction and percutaneous pin fixation. Several pinning techniques have been described in the literature, with the aim of achieving fracture stability and promoting early mobilisation. Most techniques recommend the use of at least three pins with minimum 40° crossing angle to ensure stability.^41,51,52 One should be wary of pinsite infection.

A randomised multicentre trial (DRAFFT) was done on patients (n = 461 adults, mean age 59.1 years) who underwent distal radius acute fracture fixation for dorsally displaced fractures within 3 cm of the radiocarpal joint, from 18 centres in the United Kingdom. No difference was found in functional outcomes, quality of life and number of complications between the group treated with closed reduction and percutaneous K-wire fixation (n = 230) compared to those treated with volar-locking plate fixation (n = 231) at 12 months.⁵² A five-year follow-up of this population revealed no difference in wrist pain, function and quality of life between the two arms of treatment.⁵³

Surgical fixation

Indications

The AAOS recommend surgical fixation if post-reduction radial shortening is greater than 3 mm, dorsal tilt is greater than 10°, or intra-articular displacement or step-off is greater than 2 mm.⁴⁸ Unstable fractures with dorsal comminution or those with secondary loss of reduction should be treated surgically.^41,54,55

Surgical approaches

Volar approach

Henry's volar approach is the most used approach for the treatment of DRFs. The classic approach makes use of a safe interval between brachioradialis and radial artery, and the modified approach between flexor carpi radialis tendon and radial artery to gain access to the fracture.^56,57 Multiple modifications to this approach exist. It can be extended distally to allow the release of transverse carpal ligament for visualisation of complex intra-articular fractures.⁵⁸

The choice of plate construct and plating technique should be individualised to the patient's profile, fracture pattern and surgeon's experience.^59,60 Volar plate fixation is the commonly used treatment method among surgeons for displaced DRFs.¹⁰ Fixed-angle volar plates are designed to transfer load from the intact subchondral bone through metaphysis to the diaphysis.¹⁸ Locking plates have been reported to have improved fracture site stability against axial and bending forces over non-locked plates by biomechanics studies.^61-63 However, their superiority over non-locked plates has not been demonstrated in practice. Clinical studies reporting on fixation of displaced articular fractures treated with locked plates have reported good results.^64-66 Locked plates allow for polyaxial screw fixation and can address comminuted fragments through multi-hole design.¹⁸ The choice of bicortical locked screws has not demonstrated superiority over unicortical screws.^67,68 Similarly, plates with multiple distal screw holes have not been shown to provide superior fracture stability over those with single-row locked screw holes.⁶⁹ The use of screws has been reported to have better torsional and compressive stability over pegs by the biomechanical studies.^55,70

Plate failure and other complications following volar plating are not uncommon. Wilson et al. reported 17% complication rates in patients (mean age 56.5 years) treated with volar-locking plate, at 17.5 weeks mean follow-up. Loss of fracture reduction and CTS were the two commonly reported complications.⁷¹ Johnson et al. reported similar complications in their cohort of 204 patients with a mean age of 55 years. However, the complication rate following volar plating was lower (9.7%).⁷² Flexor tendon rupture is not uncommon following volar plating. Flexor pollicis longus (FPL) is the most commonly ruptured tendon (57% of cases), followed by flexor digitorum profundus (FDP) to the index finger.⁷³ Extensor tendon irritation and rupture is not uncommon, following volar plate fixation of DRFs, and it has been associated with long dorsal penetrating screws, among other factors.^71,74,75

Dorsal approach

The dorsal approach to DRFs provides intra-articular visualisation and direct assessment of articular reduction. It is generally used in patients with severe metaphyseal dorsal comminution and those with dorsally angulated intra-articular fractures.^76,77 Historically, dorsal plating has been associated with high complications and risk of extensor tendons rupture.^41,76,77 Modern plate designs have been shown to reduce the risk of dorsal tendon attrition. Spiteri et al. reported no tendon ruptures in 46 patients treated with modern-design low-profile dorsal plates and 17 treated with combined volar and dorsal plates at the five-year follow-up. However, 8.7% had reported extensor tendons irritation, and the plates were removed in all of them.⁷⁸

External fixation

External fixation is a viable option for complex intra-articular DRFs and open fractures. It is commonly indicated for temporary fracture stabilisation.⁷⁹ Bajwa et al. reported a significantly worse mean DASH score of 12.2 in patients treated with external fixator for intra-articular DRFs compared to a mean DASH score of 3.5 in those treated with ORIF.⁸⁰ Similarly, Roh et al. reported comparable functional outcomes between external fixation and volar plate fixation in a prospective randomised trial of 92 patients with a minimum 12-month follow-up. The external fixator group had higher complication rates of 29% compared to 17% in the ORIF group.⁸¹

Intramedullary fixation

Intramedullary fixation for DRFs has been reported with enthusiasm as an option for treatment of DRFs. Tan et al. reported superior immediate- and intermediate-term functional outcomes in patients treated with intramedullary nails for DRFs compared to those treated in a cast.⁸² Similarly, Çalbiyik and Ipek reported good results in a cohort of 68 young adults, with a mean age of 46 years treated with an intramedullary fixation for extra-articular and simple intra-articular DRFs.⁸³

Arthroplasty

Arthroplasty procedure for wrist fracture is a fairly new phenomenon and evidence is limited to small sample size studies. Vergnenègre et al. reported good functional outcomes in eight elderly patients treated with Sofia wrist hemiarthroplasty system (Biotech) for unreconstructable intra-articular fractures.⁸⁴

Arthroscopic-assisted surgery

Arthroscopic-assisted surgery for DRFs has been used as an adjunct to DRFs since the 1980s. However, it has failed to gain popularity because it is time-consuming and technically demanding, with increased risk of compartment syndrome.⁸⁵ Fluoroscopy has been the modality of choice for evaluation of articular stepoff. However, multiple studies have shown that arthroscopy is superior to fluoroscopy in evaluation of the articular surface.^86-88 Adjunct wrist arthroscopy is indicated in patients with radial styloid fractures, die-punch fractures, articular step-off of > 2 mm, flipped osteochondral fragment, central comminution as well as three- to four-part fractures.⁸⁹

 

Regional and local anaesthesia

The wide awake local anaesthesia no tourniquet (WALANT) technique in the management of wrist and hand conditions has been a topic of interest in recent literature. Prior literature could not demonstrate the benefits of WALANT in patients' wrist fractures.⁹⁰ However, recent literature has demonstrated WALANT to be tolerable during fixation of DRFs without a tourniquet, with a faster recovery period and similar functional outcomes to general anaesthesia, and it is more cost-effective.^91,92

 

Adjuncts to surgery

Bone graft

A Cochrane database analysis of randomised trials concluded that there was insufficient evidence on functional outcomes and safety of the use of grafts in DRFs.⁹³ That said, in elderly patients with comminuted fractures and metaphyseal bone loss following restoration of length and alignment, bone graft substitutes are sometimes necessary. Although no graft is superior, the iliac crest bone graft can be used in cases of major bone loss, and fracture non-union is recommended.⁹⁴ Pedestal bone loss can be managed with bone graft in closed fractures, and staged bone graft reconstruction should be considered in patients with open fractures.^18,95

Calcium phosphate cement

Calcium phosphate use in DRFs has been reported to provide improved fracture stability in fractures treated with either external fixator or K-wire fixation in biomechanics studies.^96-98 Zimmermann et al. reported good results and cement incorporation in 26 postmenopausal women managed with injectable calcium phosphate bone cement and K-wires for intra-articular DRFs with a metaphyseal void of at least 5 mm. This was compared to those treated with cast immobilisation or K-wire fixation without the use of bone cement following the reduction.⁹⁹ The indications for bone cement use are not clearly defined in the literature. Ozer and Chung concluded that indications and choice of graft substitute should be based on the needs of the individual patient until further comparative research clarifies the indications and most appropriate material for a given fracture and clinical situation.⁹⁴

Pronator quadratus repair

Pronator quadratus repair following volar plating has not been shown to have a functional impact.^100-102 Some studies suggest this repair may be protective against flexor tendons rupture.¹⁰³

Carpal tunnel release during fracture fixation

Prophylactic carpal tunnel release (CTR) in patients with DRFs is not recommended.^104,105 Acute CTR should be done in patients with persistent and progressive features of acute CTS.^{22,23,106,107}

Delayed release of more than 36 hours has been associated with irreversible nerve damage, whereas patients released acutely regained full nerve function.^108-110

 

Postoperative care and rehabilitation

Postoperative rehabilitation programmes remain controversial and centre-specific.¹¹¹ Postoperative care includes immobilisation, analgesia and elevation.¹¹² Postoperative immobilisation of two weeks versus six weeks after volar plate fixation has shown no difference in long-term range of motion or functional outcomes. Although earlier range of motion exercises speeds up recovery in the acute setting, it did not translate into improved ultimate outcomes.¹¹³

Duprat et al. illustrated that the stability of a locking volar plate enabled immediate mobilisation with similar complication rates, but resulted in improved short-term outcomes in all aspects.¹¹⁴ When treatment entails closed reduction and casting, immobilisation for four to six weeks is preferred, provided that evidence of healing can be confirmed.¹¹⁵ In the absence of comorbidities, like diabetes, fracture union will have taken place. If in doubt, radiographs can be used to confirm union.

The majority of function is regained by three months, provided that good alignment was achieved, but continuous improvements up to 12 months can be expected with a slow return of grip strength.¹¹³

Athletes need to be individualised. Contact athletes can return to sport once they have achieved a pain-free range of motion and completed sport-specific drills and practice. Sports where wrist function is not required needs to be discussed with the patient and practised at their own discretion while being well informed and made aware of the risks.¹¹³

 

Adjuvant therapy

Vitamin C supplementation

Empiric vitamin C for the prevention of complex regional pain syndrome (CRPS) remains controversial. Its use has been recommended since Zollinger proved some benefit in 1999, but recent randomised controlled trials failed to demonstrate such benefit.^116-118

Vitamin D supplementation

Vitamin D deficiency is common in the elderly population with fragility DRFs.^119,120 Several studies have demonstrated hypo-vitaminosis D in young patients, even in the South African setting.^121-123 0yen et al. found that the elderly who sustain DRFs had low vitamin D levels compared to those who did not have fractures.¹¹⁹ However, Rozental et al. reported that, in Israel, there was no association of low vitamin D with DRFs.¹²⁴ Amid contrasting evidence, we propose selective patient vitamin D testing and supplementation if diagnosed with hypovitaminosis D. Tladi proposed that one should use a regimen that contains high levels of vitamin D3.¹²⁵

Bisphosphonate therapy

Timing to initiation of bisphosphonates did not alter union times or rates. Patients should be risk-stratified and initiated on bone-sparing medication if indicated.¹²⁶ Molvik and Khan reported significantly prolonged fracture union time in patients with DRFs treated with bisphosphonates in a systematic literature review.¹²⁷ However, the clinical studies reported similar radiographic and functional outcomes between patients with acute DRFs treated with bisphosphonate therapy and those who were not given bisphosphonates.^42,128,129

Low-intensity ultrasound

Low-intensity ultrasound showed promise by reducing fracture healing times from 98 days to 61 days in a study by Kristiansen et al., and from 40 days to 32 days in a study by Liu et al. No long-term benefit could be proven in these studies, and the cost over benefit of this modality remain a concern.^130,131

 

South African context

Trauma is a huge burden on an already compromised public healthcare system in South Africa. The private sector treats about 16% of the general population while the government sector treats 84%.^132,133 Patients are waiting longer to receive elective surgery because of the limitation of theatres in state hospitals.¹³⁴ The lack of resources results in delayed referrals of patients, compelling the treating surgeon to manage partially healed fractures that often result in long operating times and a high risk of complications. This ailing system has been further burdened by the Covid-19 pandemic. It is our opinion that surgeons should consider nonoperative treatment of selected DRFs. This could aid in relieving some of the pressure from the overburdened public health sector.

 

Conclusion

Distal radius fractures are common among elderly females, with increasing prevalence among all age groups. Management of these injuries remains controversial with no clear guidelines and contrasting evidence in the literature. Although nonoperative treatment is still a viable option in most cases with good results, the recent trend has seen an increase in surgical treatment. Improvements in fixation plate design have shown promising results in the reduction of complications and restoration of function in those treated surgically. Osteoporosis treatment should be initiated early in at-risk populations. High-level evidence and treatment guideline protocols are still lacking on this subject.

 

 

Ethics statement

The authors declare that this submission is in accordance with the principles laid down by the Responsible Research Publication Position Statements as developed at the 2nd World Conference on research integrity in Singapore, 2010. Ethical approval for this study was not obtained - review article.

Declaration

The authors declare authorship of this article and that they have followed sound scientific research practice. This research is original and does not transgress plagiarism policies.

Author contributions

PR: Assembled the team of reviewers, co-ordinated the review process, conducted the primary review and compiled the manuscript

SK, MT, FD and GT: Conducted the primary review and assisted with writing and reviewing the written submission

SG: Reviewed the written submission and provided senior guidance

ORCID

Rachuene PA https://orcid.org/0000-0003-4045-5301

Tladi MJ https://orcid.org/0000-0003-4997-3009

 

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Received: February 2021
Accepted: May 2021
Published: November 2021

 

 

Editor: Prof. Leonard C Marais, University of KwaZulu-Natal, Durban, South Africa
Funding: No funding was received for this study.
Conflict of interest: The authors declare they have no conflicts of interest that are directly or indirectly related to the research.
* Corresponding author: archie.pududu@gmail.co.za