William C. Allen

Learn More
Coxa saltans, or “snapping hip,” has several causes. These can be divided into three types: external, internal, and intra-articular. Snapping of the external type occurs when a thickened area of the posterior iliotibial band or the leading anterior edge of the gluteus maximus snaps forward over the greater trochanter with flexion of the hip. The internal(More)
The snapping hip syndrome is a symptom complex characterized by hip pain and an audible snapping of the hip with exercise typically seen in young individuals. "External" and "internal" etiologies have been described, although the "internal" etiology is poorly understood. A clinical, radiographic, and anatomical study of eight patients with this disorder,(More)
The purpose of this study was to determine an expedient and effective method for disinfecting contaminated human bone-tendon allografts. The first part of this study used beef muscle and cadaveric human tissues to determine the most effective solution and volume to decontaminate tissues inoculated with four different organisms: Staphylococcus aureus,(More)
The throw and its modifications are integral components of many sports. This study correlates case histories of acute injuries in throwing with a biomechanical analysis of the throwing mechanism. Comparisons are made with a similar analysis of the kick analyzed by the same film technique and computer program. Just prior to ball release, the pitching arm(More)
BACKGROUND External snapping hip is an entity that describes a snap that is felt on the lateral aspect of the hip. Several surgical interventions are described. HYPOTHESIS The external snapping hip can be corrected with a simple procedure that is minimally invasive and less demanding than other techniques. STUDY DESIGN This is a retrospective review(More)
This study analyzed the gait of women exhibiting symptoms of chondromalacia patellae, and compared them with a group of women without chondromalacia symptoms. High speed cinematography was used to film the subjects walking on a level surface and a 15 downhill slope. Flexion of the knee on both surfaces during the single support phase was significantly less(More)
Eighteen patients with 20 symptomatic hips underwent lengthening of the iliopsoas tendon for persistent painful snapping of this "internal" variety of snapping hip. We referred to the pathologic, painful snapping of the iliopsoas in the deep anterior groin as the "internal" snapping hip. This is in contrast to the more common and better-known "external"(More)
The iliopsoas bursa is a well-defined anatomic structure that has been involved in various diseases about the hip, including osteoarthritis, rheumatoid arthritis, pigmented villonodular synovitis, and synovial chondromatosis. Demonstration of the iliopsoas bursa using contrast material has been reported during hip arthrography and inadvertently during(More)
In early surgical repair of forty acute ruptures of the medial ligament of the knee in patients sixteen to twenty-four years old, the meniscus was resutured when it was avulsed from the bone and was excised only when there was central disruption (three knees). Follow-up of one to six years in thirty-six patients whose menisci were preserved showed that(More)