Outcomes following limb salvage after combat hindfoot injury are inferior to delayed amputation at five years

Objectives

The surgical challenge with severe hindfoot injuries is one of technical feasibility, and whether the limb can be salvaged. There is an additional question of whether these injuries should be managed with limb salvage, or whether patients would achieve a greater quality of life with a transtibial amputation. This study aims to measure functional outcomes in military patients sustaining hindfoot fractures, and identify injury features associated with poor function.

Methods

Follow-up was attempted in all United Kingdom military casualties sustaining hindfoot fractures. All respondents underwent short-form (SF)-12 scoring; those retaining their limb also completed the American Academy of Orthopaedic Surgeons Foot and Ankle (AAOS F&A) outcomes questionnaire. A multivariate regression analysis identified injury features associated with poor functional recovery.

Results

In 12 years of conflict, 114 patients sustained 134 fractures. Follow-up consisted of 90 fractures (90/134, 67%), at a median of five years (interquartile range (IQR) 52 to 80 months).

The median Short-Form 12 physical component score (PCS) of 62 individuals retaining their limb was 45 (IQR 36 to 53), significantly lower than the median of 51 (IQR 46 to 54) in patients who underwent delayed amputation after attempted reconstruction (p = 0.0351).

Regression analysis identified three variables associated with a poor F&A score: negative Bohler’s angle on initial radiograph; coexisting talus and calcaneus fracture; and tibial plafond fracture in addition to a hindfoot fracture. The presence of two out of three variables was associated with a significantly lower PCS compared with amputees (medians 29, IQR 27 to 43 vs 51, IQR 46 to 54; p < 0.0001).

Conclusions

At five years, patients with reconstructed hindfoot fractures have inferior outcomes to those who have delayed amputation. It is possible to identify injuries which will go on to have particularly poor outcomes.

Cite this article: P. M. Bennett, T. Stevenson, I. D. Sargeant, A. Mountain, J. G. Penn-Barwell. Outcomes following limb salvage after combat hindfoot injury are inferior to delayed amputation at five years. Bone Joint Res 2018;7:131–138. DOI: 10.1302/2046-3758.72.BJR-2017-0217.R2.

Salvage of Combat Hindfoot Fractures in 2003-2014 UK Military

BACKGROUND

Hindfoot fractures pose a considerable challenge to military orthopaedic surgeons, as combat injuries are typically the result of energy transfers not seen in civilian practice. This study aimed to characterize the pattern of hindfoot injuries sustained by UK military casualties in recent conflicts, define the early amputation and infection rate, and identify factors associated with poor early outcomes.

METHODS

The UK Joint Theatre Trauma Registry was searched for British military casualties sustaining a hindfoot fracture from Iraq and Afghanistan between 2003 and 2014. Data on the injury pattern and management were obtained along with 18-month follow-up data. Statistical analysis was performed with the chi-square test and binomial logistic regression analysis. The threshold for significance was set at P < .05. One hundred fourteen patients sustained 134 hindfoot injuries. Eighteen-month follow-up was available for 92 patients (81%) and 114 hindfeet (85%).

RESULTS

The calcaneus was fractured in 116 cases (87%): 54 (47%) were managed conservatively, 32 (28%) underwent K-wire fixation, and 30 (26%) underwent internal fixation. Nineteen patients (17%) required transtibial amputation during this time. A deep infection requiring operative treatment occurred in 13 cases (11%) with Staphylococcus aureus, the most common infectious organism (46%). A deep infection was strongly associated with operative fracture management ( P = .0016). When controlling for multiple variables, the presence of a deep infection was significantly associated with a requirement for amputation at 18 months ( P = .023). There was no association between open fractures and a requirement for amputation at 18 months ( P = .640), nor was conservative management associated with a requirement for amputation ( P = .999). Thirty-six fractures (32%) required unplanned revision surgery within the first 18 months following salvage, of which 19 (53%) involved amputation.

CONCLUSION

A deep infection was the sole variable significantly associated with a requirement for amputation by 18 months. These results suggest that attempts at salvaging these injuries are at the limits of orthopaedic technical feasibility.

LEVEL OF EVIDENCE

Level III, comparative series.

Gun-shot injuries in UK military casualties - Features associated with wound severity

INTRODUCTION

Surgical treatment of high-energy gun-shot wounds (GSWs) to the extremities is challenging. Recent surgical doctrine states that wound tracts from high-energy GSWs should be laid open, however the experience from previous conflicts suggests that some of these injuries can be managed more conservatively. The aim of this study is to firstly characterise the GSW injuries sustained by UK forces, and secondly test the hypothesis that the likely severity of GSWs can be predicted by features of the wound.

METHODS

The UK Military trauma registry was searched for cases injured by GSW in the five years between 01 January 2009 and 31 December 2013: only UK personnel were included. Clinical notes and radiographs were then reviewed. Features associated with energy transfer in extremity wounds in survivors were further examined with number of wound debridements used as a surrogate marker of wound severity.

RESULTS

There were 450 cases who met the inclusion criteria. 96 (21%) were fatally injured, with 354 (79%) surviving their injuries. Casualties in the fatality group had a median New Injury Severity Score (NISS) of 75 (IQR 75-75), while the median NISS of the survivors was 12 (IQR 4-48) with 10 survivors having a NISS of 75. In survivors the limbs were most commonly injured (56%). 'Through and through' wounds, where the bullet passes intact through the body, were strongly associated with less requirement for debridement (p<0.0001). When a bullet fragmented there was a significant association with a requirement for a greater number of wound debridements (p=0.0002), as there was if a bullet fractured a bone (p=0.0006).

CONCLUSIONS

More complex wounds, as indicated by the requirement for repeated debridements, are associated with injuries where the bullet does not pass straight through the body, or where a bone is fractured. Gunshot wounds should be assessed according to the likely energy transferred, extremity wounds without features of high energy transfer do not require extensive exploration.

Factors influencing infection in 10 years of battlefield open tibia fractures

The aim of this study was to characterise severe open tibial shaft fractures sustained by the UK military personnel over 10 years of combat in Iraq and Afghanistan. The UK military Joint Theatre Trauma Registry was searched for all such injuries, and clinical records were reviewed for all patients. One hundred Gustilo-Anderson III tibia fractures in 89 patients were identified in the 10 year study period; the majority sustained injuries through explosive weapons (63, 68 %) with the remainder being injured from gunshot wounds. Three fractures were not followed up for 12 months and were therefore excluded. Twenty-two (23 %) of the remaining 97 tibial fractures were complicated by infection, with S. aureus being the causative agent in 13/22 infected fractures (59 %). Neither injury severity, mechanism, the use of an external fixator, the need for vascularised tissue transfer nor smoking status was associated with subsequent infection. Bone loss was significantly associated with subsequent infection (p < 0.0001, Fisher's exact test). This study presents 10 years of open tibial fractures sustained in Iraq and Afghanistan. Most infection in combat open tibia fractures is caused by familiar organisms, i.e. S. aureus. While the overall severity of a casualty's injuries was not associated with infection, the degree of bone loss from the fracture was.

Dermal Fenestration With Negative Pressure Wound Therapy: A Technique for Managing Soft Tissue Injuries Associated With High-Energy Complex Foot Fractures

Military casualties can sustain complex foot fractures from blast incidents. This frequently involves the calcaneum and is commonly associated with mid-foot fracture dislocations. The foot is at risk of both compartment syndrome and the development of fracture blisters after such injuries. The amount of energy transfer and the environment in which the injury was sustained also predispose patients to potential skin necrosis and deep infection. Decompression of the compartments is a part of accepted practice in civilian trauma to reduce the risk of complications associated with significant soft tissue swelling. The traditional methods of foot fasciotomy, however, are not without significant complications. We report a simple technique of dermal fenestration combined with the use of negative pressure wound therapy, which aims to preserve the skin integrity of the foot without resorting to formal fasciotomy.

Medium-term outcomes following limb salvage for severe open tibia fracture are similar to trans-tibial amputation

Extremity injuries define the surgical burden of recent conflicts. Current literature is inconclusive when assessing the merits of limb salvage over amputation. The aim of this study was to determine medium term functional outcomes in military casualties undergoing limb salvage for severe open tibia fractures, and compare them to equivalent outcomes for unilateral trans-tibial amputees. Cases of severe open diaphyseal tibia fractures sustained in combat between 2006 and 2010, as described in a previously published series, were contacted. Consenting individuals conducted a brief telephone interview and were asked to complete a SF-36 questionnaire. These results were compared to a similar cohort of 18 military patients who sustained a unilateral trans-tibial amputation between 2004 and 2010. Forty-nine patients with 57 severe open tibia fractures met the inclusion criteria. Telephone follow-up and SF-36 questionnaire data was available for 30 patients (61%). The median follow-up was 4 years (49 months, IQR 39-63). Ten of the 30 patients required revision surgery, three of which involved conversion from initial fixation to a circular frame for non- or mal-union. Twenty-two of the 30 patients (73%) recovered sufficiently to complete an age-standardised basic military fitness test. The median physical component score of SF-36 in the limb salvage group was 46 (IQR 35-54) which was similar to the trans-tibial amputation cohort (p=0.3057, Mann-Whitney). Similarly there was no difference in mental component scores between the limb salvage and amputation groups (p=0.1595, Mann-Whitney). There was no significant difference in the proportion of patients in either the amputation or limb salvage group reporting pain (p=0.1157, Fisher's exact test) or with respect to SF-36 physical pain scores (p=0.5258, Mann-Whitney). This study demonstrates that medium term outcomes for military patients are similar following trans-tibial amputation or limb salvage following combat trauma.

Acute bilateral leg amputation following combat injury in UK servicemen

BACKGROUND

This study aims to characterise the injuries and surgical management of British servicemen sustaining bilateral lower limb amputations.

METHODS

The UK Military Trauma Registry was searched for all cases of primary bilateral lower limb amputation sustained between March 2004 and March 2010. Amputations were excluded if they occurred more than 7 days after injury or if they were at the ankle or more distal.

RESULTS

There were 1694 UK military patients injured or killed during this six-year study period. Forty-three of these (2.8%) were casualties with bilateral lower limb amputations. All casualties were men with a mean age of 25.1 years (SD 4.3): all were injured in Afghanistan by Improvised Explosive Devices (IEDs). Six casualties were in vehicles when they were injured with the remaining 37 (80%) patrolling on foot. The mean New Injury Severity Score (NISS) was 48.2 (SD 13.2): four patients had a maximum score of 75. The mean TRISS probability of survival was 60% (SD 39.4), with 18 having a survival probability of less than 50% i.e. unexpected survivors. The most common amputation pattern was bilateral trans-femoral (TF) amputations, which was seen in 25 patients (58%). Nine patients also lost an upper limb (triple amputation): no patients survived loss of all four limbs. In retained upper limbs extensive injuries to the hands and forearms were common, including loss of digits. Six patients (14%) sustained an open pelvic fracture. Perineal/genital injury was a feature in 19 (44%) patients, ranging from unilateral orchidectomy to loss of genitalia and permanent requirement for colostomy and urostomy. The mean requirement for blood products was 66 units (SD 41.7). The maximum transfusion was 12 units of platelets, 94 packed red cells, 8 cryoprecipitate, 76 units of fresh frozen plasma and 3 units of fresh whole blood, a total of 193 units of blood products.

CONCLUSIONS

Our findings detail the severe nature of these injuries together with the massive surgical and resuscitative efforts required to firstly keep patients alive and secondly reconstruct and prepare them for rehabilitation.

Aggressive soft tissue infections and amputation in military trauma patients

Due to the nature of IED injuries, during the conflicts in Iraq and Afghanistan The traditional, two-stage amputation for unsalvageable combat lower limb injuries has evolved into a strategy of serial debridement and greater use of plastic surgical techniques in order to preserve residual limb length. This study aimed to characterise the current treatment of lower limb loss with particular focus on the impact of specific wound infections. The UK military trauma registry and clinical notes were reviewed for details of all lower limb amputation identifying: 51 patients with 70 lower limb amputations. The mean number of debridements per stump prior to closure was 4.1 (95% CI 3.5-4.7). A final more proximal amputation level was required in 21 stumps (30%). Recovery of A. hydrophillia from wounds was significantly associated with a requirement for a more proximal amputation level (p=0.0038) and greater number of debridements (p=0.0474) when compared to residual limb wounds withoutA. hydrophillia.

Tetraplegia following cervical spine cord contusion from indirect gunshot injury effects

We present the case of a 31 year old British soldier who sustained a high energy gunshot injury to the neck with delayed onset tetraplegia. The bullet's transcervical track was subsequently shown to have had no direct contact with the spinal cord, but four to five minutes after injury the patient developed tetraplegia. Subsequent Magnetic Resonance Imaging confirmed this to be due to contusion of the cervical spinal cord. This case illustrates the high levels of energy potentially transferred to surrounding tissues by the passage of a high available energy projectile, causing significant injury to nearby structures not actually impacted by the missile.

British-Czech co-operation in a mass casualty incident, Sipovo. From aeromedical evacuation from Bosnia to discharge from Central Military Hospital, Prague

On Thursday 8 January 1998, a Czech Hip helicopter with 21 personnel on board crashed in Bos Krupa, northwest Bosnia, resulting in one of the largest mass casualty incidents involving peacekeepers in Bosnia since conflict broke out there in 1992. Seventeen patients were airlifted from the scene to the British Hospital Squadron in Sipovo, central Bosnia for resuscitation and initial treatment. The next day, six severely injured patients underwent aeromedical evacuation to the Central Military Hospital in Prague. The role of the British Defence Medical Services in this incident was documented in the first article of this two part series. This second article highlights the role of the Czech medical services following aeromedical evacuation of these six patients, and closes the audit trial by documenting the patients' progress and final outcome in Prague.

Mass casualty incident at Hospital Squadron Sipovo, Bosnia following a Czech hip helicopter crash, 8 Jan 1998

On Thursday 8 January 1998, a Czech Hip helicopter with 21 personnel on board crashed shortly after take off from Bos Krupa, northwest Bosnia. Seventeen casualties (including six with severe injuries) were airlifted from the scene for treatment at the British Hospital Squadron in Sipovo before aeromedical evacuation the next day to Prague, or discharge to their unit. This was the largest mass casualty incident dealt with by the British Defence Medical Services since British troops deployed to Bosnia in 1992.

The AO unreamed tibial nail: a 14-month follow-up of the 1992 TT experience

This paper reports early experiences with the immediate use of the AO unreamed tibial nail, the immediate complications and the 14 months follow-up of 13 patients with Gustilo grades I, II and IIIa open tibial fractures. The nail insertion technique was found to be clear and quickly acquired by the surgeons unfamiliar with it. There were two equipment complications associated with insertion and one early compartment syndrome. Two patients needed a split skin graft and one other patient required hyperbaric oxygen therapy with a split skin graft to bring about impact wound closure. At 14 months two nails had been electively removed. There had been four cases of locking bolt failure leading to metalwork exchange in two cases, metalwork exchange and bone graft in one case and nail removal in one cases. Two patients had undergone bone graft with nail removal or exchange. Five patients had undergone no further bony procedures. Four patients had not achieved bony union. There were no cases of early or late bone or soft-tissue infection. The authors suggest that the unreamed nail principle has a valuable place in the early management of open tibial fractures.