Biomedical subjects
Publications and source records attributed to A L Boerboom.
Bilateral coracoclavicular joints were found in a 44-year-old male patient following a fall. He had an Indonesian mother and a Dutch father. Prior to the injury he was asymptomatic and had full range of movement in both shoulders but the trauma resulted in pain and limitation of movement in the left shoulder which required resection of the anomalous joint, after which full pain-free movement was restored.
Anterior cruciate ligament (ACL) deficiency may cause functional instability of the knee (noncopers), while other patients compensate and perform at the same level as before injury (copers). This pilot study investigated whether there is a compensatory electromyographic (EMG) activity of the hamstrings in copers, noncopers and control patients. Ten patients with an ACL deficiency were equally divided into two groups of copers and noncopers. All patients underwent gait analysis with EMG of six muscles around the knee. Ten healthy young men formed the control group. In contrast to noncopers, copers showed an atypical semitendinosus activity during stance phase; the corresponding trend was found in biceps femoris activity. There was no difference between copers and controls in knee extension during stance phase. The noncopers had less knee extension. Atypical hamstring muscle activity may thus be a compensatory mechanism by which copers enable themselves to perform on a normal level.
Twelve of 14 patients who underwent arthrolysis of the elbow for post-traumatic stiffness were re-examined after a mean of 62 months. Pain and subjective stiffness were improved. The mean function of the elbow improved from 73 degrees to 112 degrees. Those operated on within a year of their injury improved twice as much as those who had been operated on after a longer period. Arthrolysis may be very rewarding when conservative treatment fails, especially when it is carried out within a year of the injury.