Mark S Vrahas, MD, Partners Chief of Orthopaedic Trauma, and Associate Professor of Orthopaedic Surgery at Harvard Medical School, describes a new way to fix tibial tubercle fractures. Dr Vrahas sees patients at the Brigham & Women’s Hospital, and the Massachusetts General Hospital.
A fracture of the tibial tubercle when associated with a fracture of the tibial plateau often disrupts the extensor mechanism and can be difficult to manage. Traditionally, tibial tubercle fractures have been repaired by lagging the tubercle fragment to the posterior cortex of the tibia. However, the screws do not get adequate purchase, particularly in comminuted or osteoporotic bone. Over several years we successfully stabilized such tubercle fractures using a simple wiring technique. Here, the tibial tubercle fragment is stabilized by wiring it directly to the screws of a locking plate. Our preliminary results using this new technique have demonstrated a high rate of clinical and radiographic union, with near normal return of extensor mechanism function.
Our technique relies on the stable fixed angle construct created by the locking plate. The tibial plateau fracture and tibial tubercle fragment are exposed using a standard proximal tibia approach. Three or four 16-gauge stainless steel wires are tunneled beneath the medial soft tissues, through the medial fracture line and into the medullary canal. Care is taken to preserve as much of the soft tissue attachments to the tibial tubercle fragment as possible. The number of wires used is dependent upon the size of the fragment; for most routine cases, we generally use two or three. The plateau fracture is then reduced and stabilized using a locking plate. The lateral free ends of the wire are then looped around the visible screw shafts and brought out to the lateral side of the fracture site. The fragment is reduced and the wires are tightened to compress the fragment into place. The locking screw shafts anchor the wires and provide an overall excellent fixation.
Patients are maintained at touch down weight bearing in a range of motion brace for six weeks to protect the plateau, but are allowed full, active, and passive range of motion from day one.
Key Learning Points
Use a proximal tibia locking plate for this kind of operation. Whether the cerclage wires used to tie down the tubercle are placed before or after the locking plate is not important. The critical factor is that the wires pass around locking screws.
JK Chakraverty, MJ Weaver, RM Smith, MS Vrahas, “Surgical Management of Tibial Tubercle Fractures in Association With Tibial Plateau Fractures Fixed by Direct Wiring to a Locking Plate,” J Orthopaedic Trauma, 2009; 23: 221-225. PDF
Filed under: Knee, Orthopaedic, Trauma, Trauma Rounds | Tagged: BWH, cerclage wires, fixation, fractures, Mass General, MGH, Partners Healthcare, Tibia, tibial plateau fracture, tibial tubercle, wiring |