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SA Orthopaedic Journal

Print version ISSN 1681-150X

SA orthop. j. vol.9 no.3 Pretoria  2010

 

CLINICAL ARTICLE

 

Controversies in the management of tibial plateau fractures

 

 

PC Pelser

MBChB. Registrar, Department of Orthopaedic Surgery, University of the Free State

Reprint requests

 

 


ABSTRACT

Over the past decades, a greater understanding of the mechanism of long-bone injury has led to a proliferation of treatments of these fractures. Various surgical techniques have been developed and enhanced, offering the modern-day surgeon a wide choice of fixation options and devices, all with their own indications, contraindications and potential problems. The treatment of the soft-tissue injuries that so often accompany tibial plateau fractures (TPFs) and the type of material that is best for the filling of subchondral defects after the reduction of depressed fractures are among a range of subjects that are also matters of controversy.
Based on a wealth of literature, this paper takes a critical look at the controversies that have developed regarding aspects of the classification, treatment modalities and prognosis of TPF with reference to related matters. After discussing each of these aspects of TPF separately, the author makes recommendations.


 

 

Introduction

Tibial plateau fractures (TPFs) represent a complex group of injuries that involve one of the major weight-bearing joints in the human body. Our understanding of the mechanism of injury, the associated injuries and the prognostic factors has evolved over the years.1,2 Accordingly there has been much advancement in the classification, evaluation, prognostication and especially treatment of these fractures. As with any evolving topic, many issues have not been settled and therefore some controversies regarding the management of TPF remain. This paper will review these controversies and aims to make recommendations according to the latest literature.

 

Controversies

Classification systems

In order to compare research and results and to aid in communication, treatment and determination of prognosis, a universal classification system of TPF is needed. The requirements of such a system would be reproducibility and reliability (both intra- and interobserver), ease of use and inclusiveness. Despite the abundance of available classification systems, none fully complies with all of the requirements. The Hohl and Moore3 classification fails to be inclusive of all fracture types, while a Turkish classification according to concomitant fibula fractures is mostly of prognostic value.4

Both the AO (Arbeitsgemeinschaft für Osteosynthesefragen)5 (Figure 1) and Schatzker classifications6 (Figure 2) are widely used, but both show suboptimal reliability. Both classifications are, however, based on X-ray imaging only, and studies have shown that computer tomography (CT) and especially spiral CT (SCT) substantially improved the reliability of both classifications.7,8,9 Moreover, SCT with 3-dimensional reconstructions (3-D) significantly improved the treatment planning in complex TPF.7 Although the AO classification has been adopted by two major journals (JBJS and the Journal of Orthopaedic Trauma), the Schatzker classification has been shown to be superior with regard to interobserver and intra-observer reliability as well as ease of use and simplicity.3 Neither of these systems includes dislocations or associated soft-tissue injuries.

 

 

 

 

Recommendation

Familiarity with any one classification will lead to better reliability, therefore a surgeon or institution should adopt either the AO or Schatzker classification and use it consistently. If plain X-rays fail to facilitate classification of a fracture, or in complex fractures, CT or SCT 3-D should be obtained. Attention must be paid to associated injuries and dislocations. For research and publication purposes, it seems to be prudent to include both classification systems.

Imaging and radiology

Radiological evaluation of TPF always commences with a trauma series of X-rays (XR) (Figure 3). These will routinely include anteroposterior (AP), lateral and oblique views.2 Due to the complex nature of these injuries and the high incidence of associated injuries, further imaging is often necessary. The role of CT and MRI (magnetic resonance imaging) is still controversial to some extent.

 

 

CT is more effective in demonstrating the fracture anatomy (Figure 4) and amount of fragments than XR and has been shown to increase the accuracy of fracture classification and surgical planning.7 This is especially true for complex and bicondylar TPF. According to Mui et al, CT can even be utilised to exclude ligament injury.10 SCT delivers a lower XR dose than conventional XR tomographic studies.7

 

 

MRI has a high sensitivity for demonstrating soft-tissue injuries (Figure 5) and is also effective in demonstrating the fracture pattern.10 Due to the high rate of concomitant soft-tissue injuries in TPF, there is a move towards more frequent MRI studies.11 The limitations to this approach are the high cost of MRI and its limited availability.

 

 

Recommendation

Standard AP, lateral and oblique XR films must form the basis for diagnosis, classification and surgical planning in TPF. CT and SCT-3D are indicated in complex fractures (Schatzker 4-6) or where classification and surgical planning cannot be made on XR alone. It is also used to diagnose hidden fractures not seen on XR. MRI is most useful for the pre-operative diagnosis of meniscus and ligamentous injuries in TPF that would otherwise have been treated percutaneously or conservatively.12

XR tomography has been replaced by SCT-3D.

Indications for surgical treatment

There is general consensus in the literature that TPFs that are stable and show minimal displacement do not require surgery.6,13,14 Contraindications to surgery have also been well established, namely severe soft-tissue swelling, active infection near the fracture site, comorbid conditions that preclude anaesthesia or appropriate postoperative rehabilitation, as well as surgeon or implant incapability to address the injury.13

The precise amount of fracture displacement, angulation, articular depression and condylar widening as well as associated soft-tissue injuries that require surgical intervention are still matters of debate. The main reason for this is the lack of correlation between the abovementioned parameters and the clinical outcome.15-20 This is further confounded by patient age, health status and functional demands. Despite all these variables, there are some indications for surgery that seem to be well accepted.13,15

Recommendation

Fracture-specific indications for surgery are the following:

• intra-articular step-off of more than 2 mm

• condylar widening of more than 5 mm

• angulation (varus-valgus or sagittal) more than 5º

Other indications for surgery would be:

• associated compartment syndrome

• ipsilateral tibia or fibula fractures

• compound fractures

The appropriate management should be individualised in each case according to these guidelines and patientspecific factors.

 

Surgical technique and fixation modalities

Various surgical techniques and approaches have been described, all with their own advantages and disadvantages. Likewise, numerous fixation options and devices are available, all with their own indications, contraindications and potential problems. The treatment of associated soft-tissue injuries and variable options for cancellous defect augmentation are also matters of controversy.

Approach and incision

Due to the relative subcutaneous nature of the tibia and the associated soft-tissue injuries with TPF, there is a high risk for wound complications.2,21,23 The matter is complicated by the need for excellent reduction and fracture visualisation, stable fixation and the extent of the fracture. The amount of soft-tissue dissection necessary with single or double incisions varies significantly. When the likelihood of future knee arthroplasty is also taken into consideration it becomes clear that the surgical approach in TPF is of utmost importance.

Although a single anterior incision allows access to both tibial condyles and has the fewest implications for future arthroplasty surgery, it necessitates extensive soft-tissue dissection and has the potential of wound complications.21,24 A dual-incision approach for double plating reduces the risk of wound breakdown when compared to a single incision due to more direct access to the fracture and less dissection.18,22 Locking-plate technology might obviate the need for medial exploration and instrumentation and allow minimallyinvasive techniques through an anterolateral incision in many bicondylar TPFs.2,24,25,26

Recommendation

A two-incision approach centred over the fragments but not directly over the plates is recommended for bicondylar TPFs that are not amenable to lateral locking-plate fixation alone. Care must be taken to leave an adequate skin gap between the incisions.

A single anterolateral incision is sufficient for fractures that can be stabilised with lateral buttress plating or locking plates and the dissection can be further minimised by using minimally invasive techniques.

A posteromedial incision is indicated for medial fracture-dislocations, posteromedial-plateau fractures and posterior metaphyseal-wedge fractures.

Raft screws

Treatment of split-depression fractures of the lateral plateau (Schatzker 2 and 3) entails reduction of the articular surface and augmentation of the subsequent cancellous cavity. Fixation can then be accomplished by subchondral parallel screws with or without a lateral buttress plate. Traditionally two large-fragment 6.5 mm cancellous lag screws were used, but alternative methods utilising small-fragment 3.5 mm screws have been described,1,27,28 as well as cannulated screws and arthroscopic assistance.29,30 Biomechanical studies show that smaller screws placed nearer to the subchondral bone have adequate construct stiffness while providing greater support to prevent depression and more favourable elasticity underneath the articular cartilage than larger screws.27

Recommendation

Buttress plating in Schatzker-type 1, 2 and 3 fractures to support raft-screw fixation is necessary for all TPFs with poor bone quality or fragment instability.2,29

A raft made up of four parallel 3.5 mm cortical screws is advisable for depressed TPFs with good bone stock and adequate augmentation of the defect.27,28

Lateral locking plate in medial TPF

Medial TPF (Schatzker 4) treatment traditionally entailed medial buttress plating, but the problem of prominent hardware and the ease of use of laterally placed minimally invasive locking plates has challenged this treatment option. Buttress plating has been shown to allow less displacement of medial fragments than conventional lateral plating,31 but fixed-angle plates have greater stability than regular tension-band lateral plating.32 The size and position of the medial fragment determines whether lateral locking-plate fixation will have an adequate grip and stabilising effect on medial TPF.33 Inadequate stabilisation of these fractures will lead to varus deformity of the tibia.12

Recommendation

Medial buttress plating through an anteromedial approach is indicated for isolated medial plateau fractures. Lateral locking plates are best suited for bicondylar fractures.

Lateral locking plate vs dual plating in bicondylar TPF

Lateral locking-plate fixation for bicondylar TPF has the advantage of a single lateral incision and therefore no devascularisation of the medial fragment and reduced wound complications.24 The fixed-angle construct is thought to have sufficient stability to treat these unstable fractures.2,25,34,35 Medial and lateral buttress plating with the resultant 'dead-bone sandwich' (Figure 6) has, however, been replaced by anteromedial anti-gliding plate and lateral buttress-plate combinations with less soft-tissue complications.36 This technique has the advantage over locking plates in that interfragmentary compression can be achieved through the plate and screws, and dual plating still remains the most rigid construct to treat bicondylar TPF.2,25 Some studies suggest that the use of a lateral locking plate alone involves a higher risk of loss of reduction and malunion than dual plating.2,24,37

 

 

Recommendation

Although dual plating remains an effective form of treatment for bicondylar TPF, lateral locking plates (especially when combined with interfragmentary screws) is a good alternative, especially for high-energy injuries with severe soft-tissue compromise and medial wounds, as well as in osteoporotic fractures or poor bone quality (Figure 7).

 

 

The fracture configuration must be taken into consideration when applying lateral locking plates in order to recognise the need for alternative or additional fixation devices such as interfragmentary screws and posteromedial anti-gliding plates.33

External fixation

The use of spanning external fixators as part of the staged management of TPF, especially in high-energy injuries (Figure 8), is well established.22 A high index of suspicion should, however, be maintained for the development of compartment syndrome after restoration of length, and the foot should not be incorporated into the frame to facilitate clinical evaluation for compartment syndrome.38 Some controversy remains, however, about the role of external fixators with or without minimal internal fixation and ring or fine-wire/Ilizarov frames. Although soft-tissue dissection and therefore also complications can be minimised with the use of external fixators, the maintenance of reduction can be problematic.39 Pin-track sepsis might be easily managed in most cases,19 but joint capsule penetration with resultant septic arthritis can be a major cause of morbidity.23 Dormant infection after pin-track sepsis will be a concern in future arthroplasty, but limited soft-tissue dissection and less hardware and scarring will be beneficial.18 Articular reduction and the identification and treatment of associated soft-tissue injuries are less effectively achieved through external fixation techniques, but this does not seem to cause any deterioration in the clinical outcome as compared to open reduction and internal fixation (ORIF).16,18,19 A shorter duration of hospital stay and fewer complications with external fixation have to be weighed against patient discomfort and potential loss of motion.2 Fine wire-ring fixation seems to be stronger than hybrid devices (Figure 9) or monolateral fixators, and compares favourably with double-plating techniques.40

 

 

 

 

Recommendation

Fine wire-ring fixators (Ilizarov frames) are a good option in the treatment of TPF with extensive soft-tissue damage, severe metaphyseal-diaphyseal comminution, extension into the tibial shaft and limited intra-articular displacement.13 Articular reduction and fixation can be achieved by olive wires or minimal ORIF with percutaneous lag screws. Placement and care of pins must be meticulous to avoid complications. Pins must be placed outside the joint capsule and away from future sites of internal fixation.

Arthroscopy

Arthroscopic reduction and internal fixation (ARIF) in the treatment of TPF is reported to have fewer complications than ORIF, but since the technique has mostly been used in less severe fractures, this finding might be insignificant. The increase in theatre time might increase the risk of infective and thrombotic complications, but is off-set by faster rehabilitation and decreased hospital stay.23,41 Fluid leakage and lower-leg compartment syndrome is a very real danger, but if the technique is applied carefully and correctly this can be prevented.14,29 Intra-articular visualisation aids in more precise fracture reduction, but adequate fixation and the application of bone graft or substitutes for depressed fractures remain essential for preventing displacement and poor outcome.14,23 One of the most claimed advantages of ARIF is the ability to treat associated intra-articular lesions like meniscus tears, but the acute reconstruction of anterior cruciate ligament (ACL) injuries is not recommended due to the additional soft-tissue damage.14

Recommendation

ARIF remains an adjunct and non-essential technique in the treatment of low-energy TPF. Fluid inflow must be gravitational only and an early bone window through an anteromedial incision is recommended to enhance outflow.29 Appropriate and adequate fixation must still be employed. Repair of tibial spine fractures, removal of small osteochondral fragments and debridement or repair of meniscus injuries can be done effectively.

 

Bone graft and substitutes

The filling of subchondral defects after reduction of depressed fractures is generally accepted as necessary, but the type of material is still controversial.2 Taking autogenous cancellous bone graft (usually from the iliac crest) has been standard practice, but the use of calcium phosphate cement (CPC), calcium sulphate, freeze-dried cancellous allograft, bovine xenograft and even trabecular metal has been proposed.42-45 Iliac-crest graft harvesting is marred by the possibility of donor site morbidity and complications, but it remains the cheapest and most readily available option.46 Yet, the total cost of treatment with CPC might actually be lower than that of autograft-treated patients due to faster rehabilitation and a shorter hospital stay.47

Although the proximal tibial metaphysis has been shown to be a reliable donor site48 it is of doubtful use in the scenario of acute TPF. For the treatment of TPF non-unions, autograft remains the golden standard.49,50

Studies have shown the stiffness and compressive strength of calcium phosphate and sulphate cement to be better than that of cancellous bone and therefore less fracture subsidence and even earlier weight bearing is possible.42,51 Calcium sulphate has become available in an injectable formula but the exothermic effect on the overlying chondrocytes is still to be determined. The rapid resorption rate has the advantage that intra-articular extravasation does not need to be removed.42 Tricalcium phosphate (TCP) granules have faster bone integration than calcium phosphate, but do not allow immediate stability and have sub-optimal cavity filling.52 The newer CPC cures rapidly with an isothermic reaction, but slow absorption and incorporation necessitate the removal of intra-articular spillage.4,53 Unlike allografts, CPC carries no risk for disease transmission, and no adverse wound effects have been reported.46,47,54-56

Osteochondral allograft can be successfully utilised in the treatment of articular defects after TPF, but is not indicated in the acute management of these fractures.57

Recommendation

Autogenous cancellous bone graft remains the golden standard in the treatment of depressed TPF. Injectable CPC is a viable alternative with obvious support from the industry. Careful application of CPC under fluoroscopic control (Figure 10) will effectively fill the subchondral gap with early stability, permitting faster rehabilitation. Stable fixation of the fracture should still be performed according to general guidelines.

 

 

Treatment of associated soft-tissue injuries

Soft-tissue injuries associated with TPF are numerous and common, despite variable incidence reports in the literature.1,2,18,20,29,30,58 The most common findings are ACL injuries, lateral and medial meniscus lesions, collateral ligament injuries, posterior cruciate ligament injuries and patella-tendon avulsion. Popliteal artery injuries are rare but must not be missed. Likewise, peroneal nerve injuries are mostly associated with fracture-dislocation type injuries. Although accelerated post-traumatic osteoarthritis (OA) is seen in unstable knees after TPF,23 clinical outcomes are similar for patients with and without initial intra-articular soft-tissue repair.18 Instability in the acute setting is difficult to confirm due to the underlying fracture, and as a late complication instability can be the cause or result of post-traumatic OA.59 Meniscus injuries are often detachments or in the red zone and therefore repairable,14,60 while meniscectomy is associated with a poor outcome.23,59 Fracture type, configuration and depression do not correlate with the incidence of meniscus injury, but MRI is both sensitive and specific for diagnosis.11 ACL repair is not advised in the acute setting and, due to arthrofibrosis, ACL-deficient knees may not show significant instability to necessitate reconstruction.41

Recommendation

Avulsion fractures need to be repaired as part of the initial management of TPF. Meniscus injuries can be repaired through open techniques or arthroscopy, but meniscectomy is contraindicated. Most collateral-ligament injuries have an acceptable outcome with conservative treatment. Likewise, ACL injuries only need secondary reconstruction if the knee is unstable after rehabilitation.

Pre-operative and postoperative assessment of the vascular and neurological status of the affected leg is of utmost importance at first presentation.

 

Rehabilitation

The principle of stable fixation and early movement is of particular importance in TPF. Early range-of-motion exercises and continuous passive movement are used to prevent arthrofibrosis. The speed at which weight bearing can be allowed is, however, controversial.61 Reports in the literature vary from partial weight bearing at two days postoperatively47 to full weight bearing (FWB) at 6 to 8 weeks1,39 and up to 12 weeks.17,24 The convention is for FWB to be commenced at 6 weeks, but this might not be applicable for all fracture types and all patient groups.

Recommendation

Depression fractures should remain non-weight bearing (NWB) for 6 weeks, unless they are low-energy injuries treated with calcium phosphate cement, in which case partial weight bearing can be allowed as pain permits. High energy, unstable fracture patterns are best kept NWB until signs of union are visible, usually around 8 to 12 weeks postoperatively. Range of motion exercises are best started 10 to 14 days postoperatively to allow wound stabilisation.

 

Future developments

The use of computer-assisted surgery (CAS) to obtain optimal alignment and the role of cartilage regeneration in the treatment of post-traumatic OA are areas of treatment that await further research.

 

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