Initial outcomes of 3-dimensional imaging-based computer-assisted retrograde drilling of talar osteochondral lesions.

Background: In operative treatment of Berndt and Harty stage 1 and stage 2 osteochondral lesions of the talus, the goal is revascularization. The use of computer-assisted guided retrograde drilling of osteochondral lesions has been described as a new technique with promising results.

Purpose: This study reports the follow-up assessment of patients treated with Iso-C-3D-navigated retrograde drilling.

Comparative study of different intraoperative 3-D image intensifiers in orthopedic trauma care.

Introduction: Recently, isocentric C-arm fluoroscopy (Iso-C 3D) has been introduced as a precise imaging modality for intraoperative evaluation and management of fractures and osteosyntheses. The Siemens Iso-C 3D collects multiple fluoroscopic images during a 190-degree arc of rotation around the anatomic region of interest and reconstructs them into sagittal, axial, and coronal planes. Like the Iso-C 3D, the new Ziehm Vario 3D imaging system reconstructs images in multiple planes, but only requires a 136-degree arc of rotation.

Intraoperative 3D imaging in calcaneal fracture care-clinical implications and decision making.

Background: In operative calcaneal fracture care malposition of screws and joint line incongruity frequently remain unrecognized using fluoroscopy intraoperatively, and are frequently only recognized on postoperative computed tomography scans. The purpose of this study was to analyze the feasibility and utility of a new C-arm-based three-dimensional imaging technology for calcaneal trauma care.

Methods: The C-arm-based three- dimensional imaging device (ISO-C-3D) was used in 32 patients during a 2-year period.

Navigated pedicle screw placement: experimental comparison between CT- and 3D fluoroscopy-based techniques.

Objective: Even with CT-based navigation, the misplacement rate for pedicle screws is reported to be as high as 10%. Using fluoroscopy-based 3D navigation, misplacement rates of 1.7 to 6% occur.

[Open reduction and internal fixation by primary subtalar arthrodesis for intraarticular calcaneal fractures].

Objective: To prevent the development of painful posttraumatic degenerative joint disease by a primary one-stage procedure to treat calcaneal fractures involving obvious comminution or severe and extensive cartilage damage to the subtalar facet.

Indications: Sanders type IV calcaneal fractures with severe and extensive cartilage destruction. The definitive indication for arthrodesis can only be established intraoperatively.

Differences in the mechanical properties of calcaneal artificial specimens, fresh frozen specimens, and embalmed specimens in experimental testing.

Background: Artificial calcanei, fresh-frozen cadaver specimens, and embalmed cadaver specimens were compared in experimental testing under biocompatible loading to clarify the biocompatibility of artificial calcaneal specimens for implant testing.

Methods: Two different artificial calcaneal bone models (Sawbone, Pacific Research Laboratories, Vashon, WA, and Synbone, Synbone Inc., Davos, Switzerland), embalmed cadaver calcaneal specimens (bone density, 313.

Intraoperative pedography: a validated method for static intraoperative biomechanical assessment.

Background: A new device was developed to perform intraoperative static pedography. The purpose of this study was to validate the introduced method by a comparison with the standard method for dynamic and static pedography.

Methods: A device known as Kraftsimulator Intraoperative Pedographie (KIOP) was developed for intraoperative placement of standardized forces to the sole of the foot.

Navigated Iso-C3D-based percutaneous osteoid osteoma resection: a preliminary clinical report.

Minimally invasive osteoid osteoma resection under computer tomography (CT) guidance has yielded good results and has become a viable alternative to open surgical procedures. Limited visualization of the actual drill position under CT guidance can frequently result in inadequate and malpositioned drilling, especially at lesions located in less accessible anatomic regions. With the conventional CT-guided drilling technique, sterility and general operative management poorly correlate with standard operating room conditions, and are at risk of intra- and postoperative complications.

A comparison of plates with and without locking screws in a calcaneal fracture model.

Background: We compared different plates in an experimental calcaneal fracture model under biocompatible loading.

Methods: Four plates were tested: a plate without locked screws (Synthes), and three different plates with locked screws (Newdeal, Darco, Synthes). Synthetic calcanei (Sawbone) were osteotomized to create a fracture model, and the plates were fixed onto them.

Intraoperative three-dimensional imaging with a motorized mobile C-arm (SIREMOBIL ISO-C-3D) in foot and ankle trauma care: a preliminary report.

Objective: The aim of the study was to assess the feasibility and benefit of the intraoperative use of a mobile C-arm with 3-dimensional imaging (ISO-C-3D).

Design: Prospective consecutive clinical study.

Setting: University hospital, level I trauma center.

Computer assisted pelvic surgery: registration based on a modified external fixator.

A fundamental step in Computer Assisted Surgery (CAS) is the registration, when the preoperative virtual data and the corresponding operative anatomy of the region of interest are merged. To provide exact landmarks for anatomical registration, a tubular external fixator was modified. Two intact pelvic bones (one artificial foam pelvis and one cadaver specimen) were used for the experimental setup.

Computer aided tumor resection in the pelvis.

Surgical treatment of malignant tumors within the pelvis is a complex problem due to the anatomy and biomechanics. There are standardized preoperative diagnostic tools like computed tomography (CT) or magnetic resonance imaging (MRI) that provide multidimensional information. However, this information cannot be transferred intraoperatively.