Reconstructive Shelf Arthroplasty as a Salvage Procedure for Complex Fifth Tarsometatarsal Joint Complex Injuries: A Case Review and Discussion
High-energy cuboid fractures are rare injuries that are commonly associated with other midfoot trauma. With displacement, operative intervention is critical to restore articular congruity and the length of the lateral column. Failure to achieve this predisposes patients to posttraumatic arthritis and deformity, often necessitating secondary procedures. Although primary open reduction and internal fixation is the standard of care for these injuries, at times the traditional principles of fracture fixation cannot be applied to cuboid fractures. We describe the case of a 45-year-old woman who underwent a reconstructive shelf arthroplasty of the cuboid and fifth tarsometatarsal joint for a severe injury to the lateral column of the midfoot.
After a 2-day postoperative course in the hospital, the patient was discharged. She remained non-weight-bearing in a splint with Robert Jones cotton bandage. At her 2-week postoperative visit, all hardware was intact and there was no evidence of infection. Her sutures were removed and she was placed in a new splint. At the patient’s 5-week postoperative visit, all K-wires were removed. At this time she remained non-weight-bearing but was transitioned into a controlled ankle movement (CAM) boot and was allowed to begin active and passive ankle exercises. At her 10-week follow-up, radiographs revealed appropriate interval healing and callus formation. The patient began weight-bearing as tolerated in the CAM boot at that time. At 12 weeks, she was transitioned into a hard-soled shoe for comfort and was allowed to ambulate in the footwear of her choice as tolerated. Her activity levels were slowly advanced, and, at her 12-month follow-up, the patient had returned to playing tennis in her recreational league with no residual sequelae (Figure 5).
Discussion
Although rare, cuboid fractures are critical to identify and can result in significant disability, as they are frequently associated with additional foot trauma, as demonstrated in this case.1-4When isolated cuboid fractures are present, further imaging must be performed, including additional radiographic views and computed tomography, to search for other injuries, such as TMT joint complex disruption.
Only those cuboid fractures that are low-energy, stable, or nondisplaced can be effectively managed conservatively.12In the presence of instability, articular incongruity, or lateral column shortening, operative intervention is warranted. Arthritic degeneration, pain, and deformity result from residual incongruity at the calcaneocuboid or TMT joints, or when lateral column length is not restored.4-6,13 The latter leads to forefoot abduction and lateral subluxation of the lesser metatarsals, with ensuing posttraumatic pes planus or planovalgus deformity, which often necessitates secondary reconstructive procedures or arthrodesis.14,15 Stable reduction and restoration of lateral column length can be challenging, particularly in the setting of comminution and bone loss. Common methods of treatment involve lifting the dorsolateral cortex of the cuboid and buttressing the impacted articular surface with bone graft or bone graft substitutes. Fixation can be achieved with K-wires, small fragment plates and screws, and distraction external fixation.11 The latter is a particularly beneficial technique, as it can be used independent of or in conjunction with ORIF.
In a study by Weber and Locher,11 the short-term to midterm results of cuboid ORIF were assessed in 12 patients. Results were found to be good with respect to restoration of length, joint reconstruction, and overall return to function.11 Admittedly, these authors at times employed a similar but conceptually different approach to our patient. In their 7 patients with severe comminution and lateral column shortening, corticocancellous ICBG was used. However, Weber and Locher11did not describe this as a shelf arthroplasty, but instead as an adjunct to primary ORIF.
In our case, the tricortical ICBG shelf arthroplasty was used as it is in the hip, as a salvage procedure. Although little is known about outcomes following shelf arthroplasty for lateral column reconstruction in the foot, a 50% failure rate has been observed in the hip.16 As such, our preference was to perform an anatomic ORIF of the cuboid and lateral column, with the shelf arthroplasty only indicated if we were unable to achieve this. We believe that the need for tricortical ICBG in the treatment of cuboid fractures is indicative of a more severe injury and that it is a less optimal and more technically demanding intervention compared with primary ORIF. Furthermore, in other studies devoted to the treatment of cuboid fractures, patients requiring reconstruction with structural graft are not included in primary ORIF cohorts.17
As in the hip, suboptimal outcomes may occur when shelf arthroplasty is performed in the foot. There are additional considerations unique to the foot that surgeons must also contemplate when considering shelf arthroplasty. As demonstrated in the literature for adult-acquired flatfoot deformity, lateral column reconstruction is challenging and controversial and is associated with overload, pain, and the need to remove prominent hardware.18 These complications may also occur after shelf arthroplasty for cuboid fractures.
The work by Weber and Locher11 did not elucidate such considerations, and outcomes of ORIF and ICBG reconstruction were not compared. This is a limitation of their study, as differences in functional outcomes between the 2 procedures remain unknown. Given the degree of comminution that precludes ORIF and necessitates a graft reconstruction, we believe that the description of the shelf arthroplasty as a salvage procedure more accurately reflects the severity of injury. This may have implications regarding outcomes and patient expectations that the orthopedic surgeon must address. Future studies must further evaluate the outcomes of this technique, independent of and in comparison with ORIF.
