Case Report of a Traumatic Atlantoaxial Rotatory Subluxation with Bilateral Locked Cervical Facets: Management, Treatment, and Outcome.

The aim was to report a rare case of isolated traumatic atlantoaxial rotatory subluxation without ligamentous injury. Management consisted of analgesia, sedation, and application of a halo skull traction device. After removing halo skull traction, full reduction and recovery were achieved without instability.

The use of a modular system to convert an anatomical total shoulder arthroplasty to a reverse shoulder arthroplasty: Clinical and radiological results.

If a modular convertible total shoulder system is used as a primary implant for an anatomical total shoulder arthroplasty, failure of the prosthesis or the rotator cuff can be addressed by converting it to a reverse shoulder arthroplasty (RSA), with retention of the humeral stem and glenoid baseplate. This has the potential to reduce morbidity and improve the results. In a retrospective study of 14 patients (15 shoulders) with a mean age of 70 years (47 to 83) we reviewed the clinical and radiological outcome of converting an anatomical shoulder arthroplasty (ASA) to a RSA using a convertible prosthetic system (SMR system, Lima, San Daniele, Italy).

Biomechanics of the hindfoot joints in response to degenerative hindfoot arthrodeses.

OBJECTIVE: The aim of this study is to understand how the different single and combined hindfoot arthrodeses affect the biomechanics of the hindfoot. DESIGN: The range of rotation of each hindfoot bone in in vitro specimens were measured and compared before and after prescribed arthrodeses. BACKGROUND: Single and combinations of single arthrodeses in the hindfoot are used by surgeons to correct hindfoot deformities.

Hindfoot motion after isolated and combined arthrodeses: measurements in anatomic specimens.

Passive motions at the subtalar joint, talonavicular joint and calcaneocuboid joint were measured in eight ankle specimens, using an ultrasonic motion analysis system. Arthrodeses of the three joints were performed in all feasible combinations and the resulting motion change at the unfused joints was determined. Motion at the subtalar joint was not significantly affected by fusion of the calcaneocuboid joint, reduced to one quarter by fusion of the talonavicular and calcaneocuboid joints (double arthrodesis) and almost completely eliminated with all other fusions.