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Biomedical subjects

J B Ryan

Publications and source records attributed to J B Ryan.

61 records · Page 4Linked to original sources
PubMedDate not supplied

Quadriceps contusions. West Point update.

A 3 year study of 117 quadriceps contusions in West Point cadets was undertaken to document the effectiveness of a three-phased therapy program to return these young athletes to full activity with a normal knee range of motion and without recurrence of injury. The treatment protocol of this study was modeled after the 1973 West Point study of Jackson and Feagin with two major changes: 1) resting the injured leg in flexion (versus extension) and 2) emphasizing early flexion exercises (versus extension). Classification of contusions was based on knee range of motion at 12 to 24 hours after the injury (mild, greater than 90 degrees; moderate, 45 degrees to 90 degrees; severe, less than 45 degrees). The average disability time was 13 days for mild, 19 days for moderate, and 21 days for severe contusions. Myositis ossificans developed in 9% of cadets and was associated with five risk factors (knee motion less than 120 degrees, injury occurring during football, previous quadriceps injury, delay in treatment greater than 3 days, and ipsilateral knee effusion.

Adolescent↗
PubMedDate not supplied

Arthroscopic Bankart repair versus nonoperative treatment for acute, initial anterior shoulder dislocations.

A prospective study evaluating nonoperative treatment versus arthroscopic Bankart suture repair for acute, initial dislocation of the shoulder was undertaken in young athletes. All patients met the following criteria: 1) sustained an acute first-time traumatic anterior dislocation, 2) no history of impingement or occult subluxation, 3) the dislocation required a manual reduction, and 4) no concomitant neurologic injury. Thirty-six athletes (average age, 20 years) met the criteria for inclusion. Group I patients were immobilized for 1 month followed by rehabilitation; they were allowed full activity at 4 months. Group II patients underwent arthroscopic Bankart repair followed by the same protocol as Group I. Group I consisted of 15 athletes. Twelve patients (80%) developed recurrent instability; 7 of the 12 have required open Bankart repair for recurrent instability. Group II consisted of 21 patients; 18 patients (86%) had no recurrent instability at last followup (average, 32 months; range, 15 to 45) (P = 0.001). One patient in Group II has required a subsequent open Bankart repair to treat symptomatic recurrence (P = 0.005). In this study, arthroscopic Bankart repair significantly reduced the recurrence rate in young athletes who sustained an acute, initial anterior dislocation of the shoulder.

Acute Disease↗
PubMedDate not supplied

Anabolic-androgenic steroid administration causes hypertrophy of immobilized and nonimmobilized skeletal muscle in a sedentary rabbit model.

Although the use of anabolic agents in athletics has generated extensive publicity and controversy, the potential therapeutic benefits of these drugs have not been fully investigated. This randomized, blinded experimental study investigated whether short-term administration of an anabolic-androgenic steroid can limit immobilization-induced muscle atrophy in a rabbit model. We casted one hindlimb each in 48 New Zealand White rabbits and randomly assigned the rabbits to two groups. The treated group received weekly intramuscular injections of the anabolic-androgenic steroid, nandrolone decanoate (15 mg/kg). Immobilization significantly decreased muscle weights in both the treated rabbits and controls. Compared with controls, the body weights of the treated rabbits increased significantly at 2, 4, and 8 weeks. At 4 and 8 weeks, wet weights, dry weights, and contractile forces were significantly greater in both the casted and noncasted tibialis anterior muscle-tendon units of the treated group. Dry weights and casted contractile forces of the extensor digitorum longus muscle unit at 4 weeks and all measures at 8 weeks were greater in the treated rabbits than in controls. These results are contrary to previously accepted views that anabolic-androgenic steroid use leads to muscle hypertrophy only in conjunction with strength training. This study adds to the growing evidence that anabolic-androgenic steroids can produce significant skeletal muscle hypertrophy in sedentary populations.

Anabolic Agents↗