James V. Nepola

Use of an articulated external fixator for fractures of the tibial plafond

We performed a prospective study of forty-nine displaced fractures of the tibial plafond in forty-eight patients managed, at three centers, with an articulated external fixator placed medially across the ankle joint. Forty ankles had interfragmental screw fixation of a reduced articular fracture, and fourteen ankles had bone-grafting. The average duration of external fixation was twelve weeks. All of the fractures healed (one after delayed bone-grafting). There were no infections in any of the operative or traumatic wounds over the tibia. Two wound infections over the fibula resolved with treatment. Eight patients were managed with antibiotics for a pin-site infection, and two patients had curettage and débridement of a pin site in the hindfoot after removal of the fixator. Thirty patients (thirty-one ankles) completed two-year data sheets at an average of thirty months after the injury. The average ankle score was 67 points. Twenty-one patients had grade-0 or 1 osteoarthrosis and nine had grade-2 or 3. One ankle had been treated with an arthrodesis. These data suggest that the prevalence of early complications associated with severe fractures of the tibial plafond and their treatment can be decreased with use of an articulated external fixator combined with limited internal fixation. We concluded that this technique of external fixation is a satisfactory technique for the treatment of these fractures.

Complications of Locking Plate Fixation in Complex Proximal Tibia Injuries

Objectives: To report the complications and pitfalls in the treatment of complex injuries of the proximal tibia when locking plates are used. Design, Setting, and Patients: This was a retrospective case series conducted at a university Level I trauma center. Thirty-seven patients with complex proximal tibia fractures (41C1, 41C2, 41C3, 41A2, 42A2) were treated with locking plates. Intervention: All fractures were treated with locking plates (Less Invasive Stabilization System (LISS); Synthes, Paoli, PA). Main Outcome Measurements: Healing, alignment, infection, and other complications. Results: Twelve fractures (32%) healed without any complications. Eight patients (22%) developed deep infections that required operative debridements, and 5 of them had a hardware removal; 1 eventually required an above-knee amputation. Eight cases (22%) had postoperative malalignment, with hyperextension as the most common deformity. Three cases (8%) had loss of alignment into varus during healing. Other complications were 1 superficial wound dehiscence, 1 delayed soft-tissue breakdown, 4 hardware irritations, 1 peroneal nerve injury at the distal part of a 9-hole plate, 1 tibial tubercle nonunion, and 1 postoperative compartment syndrome. Conclusion: The complication rate, particularly infection, was higher than in previous reports. Other complications such as hardware prominence, malalignment, and loss of alignment were similar to those of historical controls. Some of the complications may reflect the techniques that were used and should decrease with more experience; however, some may be inherent in the treatment of high-energy fractures using locking plates.

Effects of pulsed electromagnetic fields on bone healing in a rabbit tibial osteotomy model.

OBJECTIVE The purpose of this study was to determine the effect of pulsed electromagnetic field (PEMF) exposure on healing tibial osteotomies in New Zealand White rabbits. DESIGN One-millimeter Gigli saw osteotomies were stabilized by external fixation. One day after surgery, rabbits were randomly assigned to receive either no exposure (sham control) or thirty minutes or sixty minutes per day of low-frequency, low-amplitude PEMF. Radiographs were obtained weekly throughout the study. Rabbits were euthanized at fourteen, twenty-one, or twenty-eight days, and tibiae underwent either destructive torsional testing or histologic analysis. To determine the baseline torsional strength and stiffness of rabbit tibiae, eleven normal intact tibiae were tested to failure. RESULTS Sixty-minute PEMF-treated osteotomies had significantly higher torsional strength than did sham controls at fourteen and twenty-one days postoperatively. Thirty-minute PEMF-treated osteotomies were significantly stronger than sham controls only after twenty-one days. Normal intact torsional strength was achieved by fourteen days in the sixty-minute PEMF group, by twenty-one days in the thirty-minute PEMF group, and by twenty-eight days in the sham controls. Maximum fracture callus area correlated with the time to reach normal torsional strength. CONCLUSION In this animal model, low-frequency, low-amplitude PEMF significantly accelerated callus formation and osteotomy healing in a dose-dependent manner.

Rank Order Analysis of Tibial Plafond Fractures: Does Injury or Reduction Predict Outcome?

We investigated the effects of severity of initial injury pattern and the quality of the articular reduction on outcome of displaced intra-articular distal tibial fractures, using a series of 25 patients who were treated with articulated external fixation and limited internal fixation, which provided a spectrum of reduction quality. Outcome was assessed by clinical ankle scores and radio-graphic arthrosis. The results demonstrate the rank order method to be a reliable means of stratifying severity of injury and quality of reduction. Neither injury nor reduction correlated with clinical ankle score. Reduction had a significant correlation with radiographic arthrosis. We conclude that the rank order method is useful in stratification of fracture patients, and that factors other than injury pattern and quality of articular reduction are important in determining outcome of patients with this severe articular injury.

External Fixation of Tibial Plafond Fractures: Is Routine Plating of the Fibula Necessary?

OBJECTIVES To determine the advantages and disadvantages of plating an associated fibula fracture in tibial plafond fractures treated with external fixation that spans the ankle. STUDY DESIGN Retrospective clinical review. METHODS The incidence of treatment complications and the outcomes achieved were compared between two groups of patients with tibial plafond fractures and associated fractures of the fibula. Both groups were treated by a uniform technique of monolateral external fixation. One group, consisting of twenty-two patients with twenty-two fractures, had plate fixation of the distal fibula and the other group, thirty-one patients with thirty-two fractures, had no fibular fixation. RESULTS The demographics of the two groups, including sex, fracture classification, and number of open fractures, were similar. The outcome of the two groups for radiographic arthrosis and clinical ankle score, measured at minimum two-year follow-up, showed no statistically significant difference. The total numbers of complications were not statistically different between the two groups (p = 0.15), but the types of complications varied. Group I had eight complications: five fibular wound infections, two fibular nonunions, and one angular nonunion. Group II had seven complications: six angular malunions and one tibial wound infection. CONCLUSION Open reduction and internal fixation of the fibula fracture in tibial plafond fractures treated with external fixation that spans the ankle is associated with a significant rate of complications, and good clinical results may be obtained without fixing the fibula.

Unilateral External Fixation Until Healing with the Dynamic Axial Fixator for Severe Open Tibial Fractures

One hundred one cases of open tibia fractures were treated until healing with a unilateral external fixation device that permits fracture site compression with weight bearing. There were 38 type II and 63 type III (24 IIIA, 33 IIIB, six IIIC) open fractures. A standard protocol was followed including irrigation and debridement and, when necessary, flap coverage (19 cases) and bone grafting (31 cases). Fixators were applied at the first debridement and removed when the fracture was healed. All patients were permitted early partial weight bearing and progressed to full weight bearing with fixator dynamization. Ninety-six cases healed in the fixator (12-50 weeks; average, 24.6). Three of the five failures were associated with screw complications. Five patients required screw changes and 29 required oral antibiotic therapy for screw complications. Ninety-five percent of healed cases had angulation of less than 10 degrees (in any plane). There were only six fracture site infections during the course of treatment. Dynamic axial fixation may be applied at the first debridement and be used until healing in severe open tibia fractures. Change of the fixator to another treatment method is not required.

Ankle Dislocation without Fracture

Dislocation of the ankle without accompanying malleolar fracture has been regarded as a rare lesion, with few cases reported in the literature. To date, there has been no precedent for accurate descriptions of the mechanisms, optimum treatment, and long-term prognosis of this injury. Our goal was to evaluate these variables by a retrospective review of cases from our institution. We identified eight patients who had sustained ankle dislocation without fracture and were treated at the University of Iowa during the period 1958 to 1986. We interviewed and examined each patient and obtained ankle radiographs at an average of 11.5 years postinjury (range 2 to 24 years). After analyzing our cases and others reported in the literature, we have found that this injury is most common in young people (average age 31 years, range 10 to 73 years) and males (72%), and occurs most frequently in falls, motor vehicle accidents, and sports (86%). Medial displacement occurs most frequently (27%). Disruption of the mortise occurs variably. The most likely mechanism appears to be anterior or posterior extrusion of the talus from the mortise secondary to a force applied to the plantarflexed foot. Final displacement is then determined by the position of the foot and the direction of the force applied. Physical findings are commensurate with the deformity. Neurovascular compromise is uncommon (10%). Closed reduction is almost invariably accomplished easily unless the deformity is accompanied by posterior tibiofibular dislocation. Optimum treatment appears to be immobilization in a short leg cast for 6 weeks with no weightbearing for the first 3 weeks. Long-term follow-up revealed the following. Results were all good to excellent considering the following variables: return to work and sports activities, pain, instability, swelling, and ankle and subtalar joint motion. No patient reported instability and all returned to work and sports participation. We noted mild pain and swelling that was not severe enough to require medication in 25% of patients. Range of motion was normal in all but four patients; none of these lacked more than 10° of motion in any plane. Radiographic abnormalities consisted of minor ligamentous or capsular calcification in all patients, small osteophytes in four patients, and minimal joint space narrowing in one patient. No patient had normal radiographs.

Cast brace treatment of proximal tibia fractures. A ten-year follow-up study.

The long-term outcome of tibial plateau fractures treated by cast bracing was observed in 29 patients sustaining 30 tibial plateau fractures more than ten years after injury. Clinical and roentgenographic evaluation was performed and showed 61% good results overall. Range of motion averaged 117 degrees. Iowa knee score averaged 71 of 100 possible points. Thirty-two percent of the patients developed moderate or severe roentgenographic posttraumatic degenerative arthritis. Minimally displaced fractures were observed to do very well clinically without roentgenographic evidence of degenerative joint disease after a ten-year follow-up period. Seventy percent of displaced bicondylar fractures developed degenerative joint disease in clinical and roentgenographic evaluation. Cast bracing of minimally displaced fractures gave satisfactory results, whereas cast bracing of more complex fractures produced variable functional results.

Vertical shear injuries: is there a relationship between residual displacement and functional outcome?

BACKGROUND Residual vertical displacement is often cited as being related to poor outcome in patients with pelvic injuries. This study attempts to clarify the relationship between residual vertical displacement and functional outcome. METHODS From 1982 to 1989, over 500 patients with pelvic ring injuries were treated at two Level I trauma centers. Thirty-three patients with vertical shear (Tile C) fractures and residual displacement (2-52 mm) were evaluated. Outcomes were quantified by using SF-36 Short-Form Health Survey (SF-36) and the Iowa Pelvic Score (IPS). RESULTS There was no correlation between IPS or SF-36 scales and residual vertical displacement. The IPS correlated (p<0.05) with seven of eight SF-36 categories, excluding mental health. Patients reporting limp and leg length discrepancy also correlated with the IPS and select SF-36. CONCLUSION Pelvic injuries showed no correlation between functional outcome and residual vertical displacement suggesting other factors. The degree of residual vertical displacement does not affect functional outcome.

Factors affecting outcome in tibial plafond fractures.

To determine what fracture- and patient-specific variables affect outcome, 29 patients with 32 tibial plafond fractures were evaluated at a minimum of 2 years from the time of injury (range, 24–129 months; average, 46.5 months). The rank order method was used to assess severity of injury and accuracy of articular reduction on radiographs and agreement among the five surgeons was excellent with intraclass correlation coefficients of 0.93 and 0.94. Outcome was assessed by four independent measures: a radiographic arthrosis score, a subjective ankle score, the Short Form-36 (SF-36), and the patient’s ability to return to work. The four outcome measures did not correlate with each other. Radiographic arthrosis was predicted best by severity of injury and accuracy of reduction. However, these variables did not show any significant relationship to the clinical ankle score, the SF-36, or return to work. These outcome measures were more influenced by patient-specific socioeconomic factors. Higher ankle scores were seen in patients with college degrees and lower scores were seen in patients with a work-related injury. The ability to return to work was affected by the patient’s level of education. This study highlights the difficulties of predicting patient outcome, after these severe articular fractures.