Efficacy of Temporary Intentional Leg Shortening and Deformation for Treatment of Massive Bone and Soft Tissue Defects in Three Patients
Corresponding Author: Hidenori Matsubara, Department of Orthopaedic Surgery, Graduate School of Medical Sciences, Kanazawa University, Kanazawa, Ishikawa, Japan, Phone: +81 762652374, e-mail: email@example.com
How to cite this article: Ugaji S, Matsubara H, Aikawa T, et al. Efficacy of Temporary Intentional Leg Shortening and Deformation for Treatment of Massive Bone and Soft Tissue Defects in Three Patients. Strategies Trauma Limb Reconstr 2022;17(3):195–201.
Source of support: Nil
Conflict of interest: None
Received on: 02 September 2021; Accepted on: 22 August 2022; Published on: 30 December 2022
Aim: This study describes the intentional deformation and shortening of a limb using external fixation (EF) in three patients with post-traumatic injury tibial defects and to assess the outcomes.
Case description: Three patients with infected non-unions and massive bone and soft tissue defects who were treated with temporary intentional leg shortening and deformation using a Taylor Spatial Frame (TSF) EF were retrospectively reviewed. The alignment was restored by gradual deformity correction and lengthening after a 2-week interval. No additional surgical intervention was required for soft tissue reconstruction after primary skin closure. Skin closure and good bone alignment were achieved in all patients. The functional outcomes and bone outcomes were evaluated for all cases according to the Paley criteria modified by the Association for the Study and Application of Methods of Ilizarov. All patients showed excellent bone outcomes. Two patients achieved excellent functional outcomes and one had a good outcome. The patient with a good outcome was unable to descend the stairs comfortably.
Conclusion: This technique is suitable for treating massive bone and soft tissue defects and should be considered as a treatment option.
Keywords: Bone defect, External fixator, Infection, Taylor Spatial Frame, Tibia.
Massive bone and soft tissue defects are difficult to treat1,2 because both the defects require transplantation from other sites along with bone grafts; excellent surgical skills are necessary to perform these techniques. Treatment options include flaps,3 vascularised fibula grafts,2 and the Masquelet technique.4–7 However, many hospitals do not have orthoplastic teams to perform flap or microsurgery procedures. Free vascularised transfer of tissue involves a donor site morbidity and, despite this sacrifice, there are instances of flap failure. The Masquelet technique requires an intact soft tissue envelope and can only treat bone defects; this technique also requires a large amount of bone graft. This study aims to report the technique of temporary intentional leg shortening and deformation, which has been reported by Nho et al.8 in the English literature, and to assess the outcomes. We describe the advantages and disadvantages of this method.
The treatment method involves a temporary intentional leg shortening and deformation using an EF. This treatment can be used for a wide range of bone and soft tissue defects and, in these instances, uses a hexapod EF frame, the TSF. Devitalised bone and tissue are removed before the EF is applied; the limb is then manipulated, creating both a deformity and shortening, in order to approximate the ends of the wound and allow for primary closure (Fig. 1). At one week after this closure, a deformity correction protocol is initiated.
Three patients with post-traumatic injury defects of the tibia were treated by intentional deformation and shortening using the TSF in this study. Two of the three patients were also treated with bone transport. Post-tibial assessment used the Paley criteria modified by Application of Methods of Ilizarov.9,10 The patients’ data are summarised in Table 1.
|Characteristics||Patient 1||Patient 2||Patient 3|
|Bone loss (cm)||4.5||5||7|
|Soft tissue loss (cm)||7||10||10|
|EF period (day)||84||110||364|
|EF index (day/cm)||15||22||52|
A 48-year-old male was injured by a concrete block that fell on his left lower leg. He sustained a Gustilo type 3C open fracture11,12 of the proximal tibia (Fig. 2A). The posterior tibial artery, peroneal artery, and anterior tibial artery were ruptured. An anastomosis of the posterior tibial and peroneal arteries was performed, and the tibia was shortened by 3 cm. A uniplanar EF was applied (Fig. 2B). Four months later, he was referred to our institution for further treatment of the 3-cm tibial shortening, an infected non-union and a residual soft tissue defect. Methicillin-sensitive Staphylococcus aureus was detected from the open wound and over-granulation had formed (Fig. 3A). The antibiotic cefazolin was administered intravenously for the methicillin-susceptible S. aureus. Debridement of the granulation tissue was performed first. This resulted in an anterior soft tissue defect measuring 7 cm by 2 cm. The non-union was exposed and resected. We then confirmed that the edges of the wound could be approximated by acute deformation of the limb (Fig. 3B). Three pre-constructed rings of TSF were applied; the anterior wound with exposed bone was closed by deforming the leg, creating a 25° apex–posterior angulation. An osteotomy at the distal part of the tibia was performed for lengthening to compensate for the limb shortening (Fig. 2C). Lengthening was commenced at the distal osteotomy (0.5 mm/day) 2 weeks postoperatively. The limb was kept in the deformed position for 3 weeks. A correction was commenced thereafter and took 6 weeks to complete (Fig. 2D) but the eventual 45-mm lengthening took 3 months to achieve equal leg lengths. The wound was healed completely at this time. The final procedure was to substitute the EF for plate fixation (Fig. 2E). Fifty months after the first operation (Fig. 2F), the patient was able to walk without pain (Fig. 3C). Using the outcome measures described earlier (modified criteria of Paley et al.), the bone result was excellent at 2 years after the procedure whereas the functional result was good.
A 55-year-old male had fallen and suffered a closed fracture at the distal tibia and fibula (Fig. 4A). The first surgeon had performed an open reduction and internal fixation with a plate on the lateral malleolus and anteromedial tibia 9 days after the injury (Fig. 4B). This wound became infected. Despite repeated debridement, the infection had not improved; the plates were removed at 2 months postoperatively (Fig. 4C). The patient was referred to our institution for treatment. At the first consultation, the tibia, tibialis anterior, and peroneal tendons were found exposed (Fig. 5A). One wound was anterior 10 cm × 3 cm and the other wound was lateral 9 cm × 3 cm. Negative-pressure wound therapy was commenced initially in an attempt to reduce the soft tissue defects. At definitive surgery, the medial malleolus that was un-united was removed. The TSF was applied and, to achieve primary closure of the wound (Fig. 5B), the foot was moved 4° valgus, 31° dorsiflexion, and 10-mm anterior translation (Fig. 4D). The wound was then closed. A proximal tibial lengthening was planned to occur concurrently with a correction of the deformity distally after a wait-period of 2 weeks (Fig. 4E). Three months after the operation, good alignment and 50-mm lengthening had been achieved. The wound was healed completely at 3 months (Fig. 5C). Four months after the first operation, conversion of fixation to plate and screws was performed. However, the distal docking site showed a non-union. Eight months after the first operation, we performed arthrodesis at the subtalar and talocrural joint using a retrograde nail and iliac crest bone graft (Figs 4F and G). At review of 4 years following the first operation, the alignment was assessed to be good, there was no leg length discrepancy (Fig. 4H), and the patient walked without a limp. The bone and functional scores were excellent according to the modified criteria of Paley et al.
A 21-year-old male had been in a traffic accident and sustained an open tibial shaft fracture (Fig. 6A). A previous surgeon had placed a cement spacer after debridement and applied an EF (Fig. 6B). One month after the injury, he was referred to our institution for treatment of bone and soft tissue defects. A 3 cm × 5 cm soft tissue defect exposing the cement spacer was found distal to the lower tibial shaft (Fig. 7A). Pseudomonas aeruginosa was detected in a wound culture. At surgery, devitalised and contaminated soft tissue was excised, and the cement spacer removed (Fig. 7B). We were able to confirm the soft tissue wound edges could be approximated by intentional shortening and deformation (Fig. 7C) of 10° of varus and 4° of apex–posterior angulation (Fig. 6C). Bone lengthening was performed proximally through an osteotomy and deformation was corrected distally after a 2-week waiting period. The wound was healed completely 1.5 months after the operation (Fig. 7D). Restoration of alignment took approximately 4 months because of the large amount of shortening (Fig. 6D). The leg lengths became equal at 5 months after a 7-cm lengthening (Fig. 6E). As this case was not suitable for plate conversion, iliac bone grafting at the docking site was performed. One year after the operation, bone union was achieved, and the hardware was removed. Two years following the first operation, this patient is able to run, climb stairs, and work as a caregiver (Figs 6F and 7E). The bone and functional outcomes were excellent according to the modified criteria of Paley et al.
The method of intentional shortening and deformity creation enabled simultaneous treatment of soft tissue and bone defects. Generally, an infected non-union (bone defect) is treated by removing all infected bone and then filling the void with normal bone.4 Vascularised fibula, bone transport, and the Masquelet technique are used for bone reconstruction. Treatment is more difficult when soft tissue defects are present in addition to bone defects.1 Soft tissue reconstruction can be treated with a vascularized fibular and flap but these options have disadvantages. First, a vascularized fibula is associated with complications at both the donor and recipient sites. The recipient site needs to hypertrophy13 and there are risks of stress fractures of the grafted fibula.14 The donor site has a risk of ankle instability15 and valgus deformity.16 Second, bone transport has a high probability of needing bone grafting at the docking site. Therefore, surgery must be performed multiple times. Third, a vascularised free flap depends on the recipient site condition and success is highly dependent on the operator’s skill. Use of a flap always carries the risk of flap loss.17–19
This method can treat bone and soft tissue defects simultaneously by applying deformation and shortening and does not require a flap. This method can also be used to treat patients in whom a flap is not possible. Case 1 in the present study involved a patient with vascular injuries. High rates of flap failure have reportedly been correlated with decreasing numbers of patent vessels in the leg.20 Therefore, a good indication for intentional deformation and shortening is for patients in whom a flap cannot be used because of the vascular status.
The method proposed for simultaneous treatment of bone and soft tissue defects has some disadvantages. First, this method must be used with a ring EF, which is a heavy burden for patients. Second, this method takes a long time. Our Cases 1 and 2, but not Case 3, underwent plate conversion. Therefore, the EF period was much longer for the patient in Case 3 than for the other two patients (Table 1).
This method was reported by Nho et al.8 and was used to treat parts of some open fractures. Subsequently, Gulsen and Ozkan21 used this method to treat infected non-unions (bone defects) in two parts. An unusual aspect of our cases was that Cases 2 and 3 underwent bone transport; there have been no similar reports to date. Moreover, the method we adopted involved the use of three rings of the TSF with the deformity correction performed only at the sites with soft tissue damage and the bone lengthened at the healthy sites. Avoiding bone lengthening at the site of soft tissue injuries can lead to good bone maturation in an area of normal blood flow. The Ilizarov method22,23 is based on “distraction histogenesis” which is a local biological regenerative process. Distraction osteogenesis induces an increased blood flow in the bone lengthening part24,25 which augments the healing of both bone and soft tissue. Treatment at two sites simultaneously also adds to this improved lower-limb blood flow. This is a useful method when the bone defect and soft tissue defect occur simultaneously.26
The important points to note regarding this method are the amount of shortening and deformation. It has been said that 3 cm is the limit for an acute shortening of the tibia.27 Others have reported that middle and distal tibial defects can routinely accommodate up to 6 cm of acute shortening.28,29 In our case series, the maximum shortening was 4 cm. If it is found that the amount of shortening is insufficient to create bone-to-bone contact, this can be adjusted by performing bone transport. Caution is required because neurovascular bundles undergo kinking and normal function may not be possible. It is important to monitor the foot with a pulse oximeter when shortening and producing the deformation.
This case series is small because the conditions for which this method is indicated are very limited. Vascular injuries, such as Gustilo 3C, are rare.30 Further evaluation of cases using such a method is needed and the scarcity of numbers may be overcome by collecting data from multiple centres.
This study has showed that intractable cases involving patients with massive bone and soft tissue defects can benefit from reconstruction using intentional deformation and shortening.
Hidenori Matsubara https://orcid.org/0000-0002-8394-1003
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