Biomedical subjects

J J Schaffer

Publications and source records attributed to J J Schaffer.

5 recordsLinked to original sources

PubMed1990

A simplified approach to the tibial attachment of the posterior cruciate ligament.

The standard approach through the popliteal fossa to the tibial attachment of the posterior cruciate ligament (PCL) can be time-consuming and is regarded as hazardous. The simplified approach does not transect or expose neurovascular structures as in other procedures. With dissection on the medial border of the medial head of the gastrocnemius and by lateral retraction, the posterior capsule is safely exposed. The approach is ideal for internal fixation of an avulsed tibial attachment of the PCL.

Adolescent↗

PubMed1987

Maisonneuve fracture: case report of a missed diagnosis.

We report the case of a Maisonneuve fracture of the fibula in which the diagnosis was initially missed. The patient presented with a chief complaint of medial ankle pain. Rentograms of the ankle were unremarkable, and the proximal fibula was not examined. He returned four days later with increased pain, at which time examination revealed tenderness along the proximal fibula and medial ankle. Roentgenograms showed widening of the medial joint space of the ankle and an oblique crush of the proximal fibula. The patient underwent open reduction and internal fixation of the syndesmosis and repair of the deltoid ligament, and recovered uneventfully. Physical examination of ankle injuries should include the proximal fibula.

Adult↗

PubMed1987

Posterior tibial tendon rupture in pronation-external rotation ankle fractures.

We have recently treated two patients with closed pronation-external rotation bimalleolar ankle fractures. During the surgical explorations, an avulsion type rupture of the posterior tibial tendon was observed. Open reduction and internal fixation of the fracture in conjunction with primary tendon repair has produced excellent clinical results. We wish to report these two cases of this uncommon injury. More important, we wish to point out the association of the tendon rupture in conjunction with a particular type of fracture pattern.

Adult↗

PubMed1987

The antiglide plate for distal fibular fixation. A biomechanical comparison with fixation with a lateral plate.

Posterior antiglide plates recently have been introduced as a method of fixation for the short oblique fracture (Type B, as defined by the AO Group) of the distal part of the fibula. This method has several advantages over the more commonly used lateral plate for the fixation of this type of fracture, including dissection of a smaller area and less operative time, minimum bending of the plate, and no potential for penetration of a screw into the joint. The system can also be applied without insertion of a screw into the distal fragment. This prompted us to compare the biomechanical properties of fixation with the antiglide and lateral plating systems. Short oblique fractures of the distal part of the fibula were produced mechanically in cadaveric legs by supination and external rotation of the foot. The torque that was necessary to produce the fracture in each of twenty-four fibulae was recorded. After fracture, each fibula was reduced anatomically and fixed internally with a lateral plate or antiglide plate applied posteriorly. The strength of fixation was measured by restressing the legs until failure of fixation occurred. The stiffness of the fixation system and the amount of energy required to produce failure of fixation were also calculated. The system using the lateral plate for fixation failed when the torque reached an average of 64.3 per cent of the torque that produced the fracture.(ABSTRACT TRUNCATED AT 250 WORDS)

Biomechanical Phenomena↗

PubMedDate not supplied

Late-onset tibia vara.

Fifteen children with late-onset tibia vara were studied. There were seven unilateral and eight bilateral cases. Eleven children were male, four were female and 13 were black; 14 were obese. All had a history of gradually progressive genu varus (average onset 11 years); 12 had preoperative knee pain. The average age at surgery was 12 years, with a preoperative tibiofemoral angle of 14 degree varus. The average follow-up was 4 years 4 months. The average tibiofemoral angle at follow-up was 0 degrees. There were 15 good, two fair, and six poor final results.

Adolescent↗