Compressive Strength of Midfoot Fusion Nail vs Midfoot Fusion Bolt and Role of Subtalar Fusion in Midfoot Charcot Fixation Model.

BACKGROUND: Operative management of midfoot Charcot arthropathy often involves an extended midfoot arthrodesis with intramedullary bolts for fixation, a method called "beaming." Recently intramedullary nails have been introduced for the same indication, presumably providing stronger fixation. This study compares midfoot fusion nails to bolts with regard to stiffness and compressive ability. Additionally, we assessed how the addition of a subtalar fusion affects the construct. METHODS: Medial column fusions were performed on 10 matched cadaver foot specimens with either a midfoot fusion nail or bolt. Specimens underwent cyclical compression loading, and displacement was measured. Separately, compressive forces produced were compared between the 2 fixation constructs using a synthetic bone block model. Lastly, another 10 matched specimens with midfoot fusion nails were evaluated with or without subtalar fusions. RESULTS: No differences in stiffness were found in comparing matched specimens between nail vs bolt or comparing nail only without subtalar fusion (STF) vs nail with STF. The compressive force produced by the nail specimens was significantly and substantially greater than the bolted specimens (751.7 vs 139.0 N, P = .01). The accumulated height drop at the midfoot after cycling was 0.5 mm more in the nail group than in the bolt group (1.72 vs 1.22 mm, P = .008). The nail with STF group had greater initial height drop at the midfoot than the nail-only group (0.68 vs 0.34 mm, P = .035) with similar initial height drop at the ankle. However, there were no differences in strength among the matched pairs of midfoot nail-only vs midfoot nail with STF as measured by displacement after fatigue or maximum force at load to failure. CONCLUSION: The overall cadaveric comparisons between matched pairs of nails vs bolts, and nail-only vs nail with STF, did not provide noteworthy differences between the groups with regard to strength or stiffness. However, the compressive force of the midfoot fusion nail was far superior to the bolt in a synthetic bone model. These data provide valuable insight comparing implants used in Charcot midfoot arthrodesis.

Incidence of Vitamin D Deficiency in Foot and Ankle Arthrodesis Nonunions.

Background Vitamin D has been found to be crucial in musculoskeletal health. The role of vitamin D levels in orthopedic patients has become a growing area of interest given its negative impact on fracture healing which can contribute to the development of nonunion following surgery. We sought to investigate the incidence of hypovitaminosis D in a cohort of patients who experienced a nonunion following a foot and ankle arthrodesis procedure. Methodology Patients who underwent a major elective foot and ankle arthrodesis procedure and developed a nonunion were given the opportunity to obtain serum vitamin D levels. All vitamin D levels were reported from percutaneous venous blood samples and compared to our institution's range of accepted normal values (25-80 ng/mL). Results A total of 13 patients who developed a nonunion agreed to have a vitamin D level obtained, and 11 of 13 patients had a low vitamin D level (average = 14.6 ng/mL, range = 9-24 ng/mL). Five patients underwent revision arthrodesis after normalization of vitamin D levels, and four out of five patients went on to successful union. Conclusions Hypovitaminosis D may be a modifiable risk factor for nonunion following a major foot and ankle arthrodesis procedure. Orthopedic surgeons should consider vitamin D screening and supplementation in patients undergoing elective arthrodesis procedures.

Use of Standardized Language for C-arm Fluoroscopy Improves Intraoperative Communication and Efficiency.

INTRODUCTION: Intraoperative fluoroscopy is a ubiquitous tool in orthopaedic surgery. However, many orthopaedic surgeons and radiology technologists are not taught standard terminology to communicate with one another. Breakdown of communication leads to inefficiencies. Simulation studies have demonstrated that a common language for C-arm movements may reduce time to capture the desired images and number of radiographs required. Our objective was to investigate the effect of a standardized language protocol for intraoperative C-arm fluoroscopy on communication as perceived by the surgeon and radiology technologists. METHODS: Our study intervention was the implementation of a common C-arm fluoroscopy terminology education protocol. To evaluate the efficacy of this protocol, a survey was administered to orthopaedic surgeons and radiology technologists after procedures involving the use of intraoperative fluoroscopy. Study end points were measured using a 5-point Likert scale and included effectiveness of communication, need for obtaining repeat radiographs, need to correct the C-arm position, and confusion noted during surgery. This survey was administered before and after the study intervention. RESULTS: The study intervention resulted in a statistically significant improvement in the mean perceived quality of intraoperative communication between the surgeon and the radiology technologist (0.398 [0.072, 0.725], P = 0.017). There was also a reported decrease in confusion in the operating room (-0.572 [-0.880, -0.263], P < 0.001), movement correction of the C-arm fluoroscope (-0.592 [-0.936, -0.248], P = 0.001), and need for repeat radiographs (-0.782 [-1.158, -0.406], P < 0.001) after the implementation of a standardized fluoroscopy language. CONCLUSION: A standardized fluoroscopy language protocol improves intraoperative communication between orthopaedic surgeons and radiology technologists.