Background

Proper positioning of the acetabular component is critical for prevention of dislocation and excessive wear for total hip arthroplasty (THA) and hip resurfacing. Consideration of preoperative pelvic tilt (PT) may aid in acetabular component placement. The purpose of this study was to investigate how PT changes after hip resurfacing, via pre and post-operative radiographic analysis of anterior pelvic plane (APP), and whether radiographic analysis of the APP is a reproducible method for evaluating PT in resurfaced hips.

Minimally invasive plate osteosynthesis is a technically feasible surgical alternative to treat displaced diaphyseal fractures of the tibia. In recent years, this technique has evolved in response to the poor results following tibial fracture stabilization using the traditional open method of plate fixation. Devascularisation with periosteal stripping of bone fragments using open reduction and internal fixation to ensure adequate fracture visualisation led to a substantial percentage of complications including deep infection, delayed union or non union, and refractures after plate removal. Using the technique of minimally invasive plate osteosynthesis, fracture management is achieved with closed reduction followed by stabilisation using a subcutaneous epiperiosteal LC-DC-plate.

Twenty-four patients with 25 tibial fractures were treated by minimally invasive plate osteosynthesis at the Kantonsspital, Fribourg, Switzerland, between 1997 and 1999. These cases were retrospectively reviewed.

There were 11 male and 13 female patients with a mean age of 41 years (range 16 -64). Nineteen tibial diaphyseal fractures (7 type A, 11 type B, and 1 type C) and six tibial epiphyseal-metaphyseal fractures (4 type A, 1 type B, and 1 type C) were surgically treated. Three fractures were open (grade I). Twenty-four fractures were treated using a 4.5 mm titanium LC-DC-plate, and in one fracture a 4.5 mm stainless steel DC-plate was used for tibial fixation. Open reduction and internal fixation of the fibula was necessary in eleven fractures, nine of which were stabilized with a one-third tubular plate and two with a 3.5 mm LC-DC-plate. The postoperative regimen included partial weight bearing for eight weeks followed by progressive and protected weight bearing until fracture union was achieved. Fracture union was confirmed with radiographs obtained at six to eight weeks, twelve to sixteen weeks, and at final follow-up. The mean time to final follow-up was eighteen months.

All fractures had solidly united within four months postoperatively. Radiographically, healing was characterised by callus formation located on the lateral and posterior aspects of the tibial diaphysis, and was similar to that which is usually seen after stabilisation of tibial fractures using an intramedullary rod. Both ankle and knee range of motion were similar to the uninjured side by final follow-up. There were eight cases of residual valgus malalignment of less than five degrees, and were associated with distal third tibial diaphyseal fractures with concomitant fibula fractures which were not rigidly stabilised. Postoperative complications included two deep wound infections and one postoperative compartment syndrome.

Overall good results were obtained by using minimally invasive plate osteosynthesis of diaphyseal fractures of the tibia. Although this technique is more technically demanding than standard open reduction and internal fixation of tibial diaphyseal fractures, preservation of the soft tissue envelope and periosteal blood supply is beneficial for fracture healing. Surgical indications for minimally invasive plate osteosynthesis of the tibial diaphysis include a narrow tibial medullary canal as well as distal and proximal metaphyseal fractures not suitable for intramedullary rodding, and associated intra-articular tibial fractures. Minimally invasive plate osteosynthesis should be considered as a surgical alternative for the treatment of displaced diaphyseal fractures of the tibia.