Late results were determined for 42 patients who had undergone detorsion and fixation for unilateral testicular torsion in the prepubertal and pubertal age. Exocrine and endocrine function for the testes was determined in 30 patients who had reached postpuberal age. Patients who underwent detorsion and fixation 8 hours or less after the onset of symptoms had normal-sized testicles and only slight changes in testicular morphology. When treatment was delayed and detorsion was done more than 8 hours later a marked decrease was observed in testicular size. The exocrine function in patients with torsion was reduced. The semen quality, as judged by 2 semen analyses, was normal in 15 patients, doubtful in 3 and pathological in 12. Even when detorsion was done 4 hours or less after the onset of symptoms the exocrine function of the testes was normal in only 50 per cent of the cases. In patients with doubtful and pathological sperm analyses higher follicle-stimulating and luteinizing hormone levels were observed.

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