Biomedical subjects

A D Mazzocca

Publications and source records attributed to A D Mazzocca.

3 recordsLinked to original sources

PubMed1998

The nonarticulating portion of the radial head: anatomic and clinical correlations for internal fixation.

The proximal radioulnar joint was dissected in 24 cadaveric elbows to localize the area of the radial head that did not articulate with the lesser sigmoid notch of the ulna. The nonarticulating portion of the radial head was posterolateral in the anatomic position of full supination. Gross observations of the nonarticulating portion of the radial head revealed a thinner band of yellowish cartilage relative to a wider, white, glistening cartilage of the articular portion of the radial head. The nonarticular portion of the radial head did not contain the angled peak, which is most prominent in the middle of the articular portion. The average arc of the nonarticulating radial head was 113 degrees (range, 106 degrees to 120 degrees; standard deviation, 4 degrees). This nonarticulating portion of the radial head (or safe zone for prominent fixation) consistently encompassed a 90 degrees angle localized by palpation of the radial styloid and Lister's tubercle. Using these palpable distal landmarks to localize the safe zone of the radial head, 24 different cadaveric elbows were internally fixed with a plate and screws through 3 different approaches (anterior, lateral, and posterolateral). Regardless of approach, the internal fixation allowed full forearm rotation in all the specimens. Utilization of this method and anatomic landmarks to localize the nonarticular portion of the radial head may assist the surgeon in open reduction and internal fixation of fractures of the radial head and neck.

Cadaver↗

PubMed1991

A comparison between computer-controlled and set work rate exercise based on target heart rate.

Good exercise prescriptions provide work rates (WRs) that maintain heart rates (HR) in a target zone and at a percent of maximum metabolic equivalent (%METmax). HR and MET were evaluated from computer-controlled and set WR (constant speed) sessions (20 min at 65% METmax). Computer-controlled WR used a control algorithm to adjust speed and grade to maintain the target HR. The set WR (mean +/- S.D.) HR (139 +/- 8 bpm) was lower (p less than 0.05) than the target (147 +/- 3 bpm) and computer-controlled HRs (153 +/- 5 bpm). The set WR MET (8.6 +/- 2.2) was not different than the target (8.6 +/- 2.2), but both were lower than computer-controlled exercise (9.7 +/- 2.2). Computer-control time in target HR zone (16 +/- 5 min) was significantly (p less than 0.004) greater than set WR exercise (6 +/- 5 min). Computer-controlled WR was significantly better in maintaining target HR and the MET values were not physiologically different than target WRs.

Adult↗

PubMedDate not supplied

Comparison of the posterior approach versus the dorsal approach in the treatment of congenital vertical talus.

The purpose of this study was to compare retrospectively the results of a single-stage dorsal approach versus the posterior approach for the surgical treatment of congenital vertical talus (CVT) at a single institution. Twenty-four patients (33 feet) with CVT were treated surgically between 1960 and 1998. Eighteen patients (25 feet) underwent a posterior release (group 1), and six patients (eight feet) underwent surgery via the dorsal approach (group 2). All patients were evaluated at a minimal follow-up of 3 years. Preoperative and follow-up radiographs were evaluated, and a modified version of the clinical score by Adalaar was used. Group 1 had 45 procedures on 25 feet, whereas group 2 had no repeated or revision operations. The clinical score was 6.75 for group 1 and 8.0 for group 2. Tourniquet time was 123 minutes and 87 minutes for groups 1 and 2, respectively. Twelve group 1 patients (48%) had avascular necrosis (AVN) versus none of the group 2 patients. Both groups had similar preoperative and postoperative radiographic measurements. Both approaches were able to reduce successfully the talonavicular joint; however, the single-stage dorsal incision group required significantly less operative time, had better clinical scores, and had fewer complications 3 years after surgery.

Adolescent↗