Approach to the management of slipped capital femoral epiphysis and primary hyperparathyroidism.

Context: Worldwide, only nine cases of slipped capital femoral epiphysis (SCFE) associated with primary hyperparathyroidism (PHP) have been reported.

Case Illustration: This is a report on adolescent subjects with SCFE associated with PHP exhibiting the leading pathogenesis and clinical course.

Methods: Here, we reviewed all known cases and developed an effective approach to the management of SCFE and PHP.

Results: In cases of emergency, SCFE fixation is primarily done regardless of any preexistent hypercalcemia due to PHP and is followed by parathyroidectomy as soon as possible. In cases of mild and moderate hypercalcemia, whether SCFE fixation is followed by parathyroidectomy and vice versa or resolved during a single operating session depends on the side effects of hypercalcemia. Severely hypercalcemic patients should undergo urgent parathyroidectomy followed by immediate orthopedic surgery or even as a simultaneous procedure. This is to avoid onset of hypercalcemic side effects or worsening of preexisting side manifestations resulting from hypercalcemia.

Conclusion: Our report demonstrates that SCFE patients presenting with hypercalcemia, signs of low bone density, or with non-typical age of onset deserve further workup for secondary causes. In addition, the newly developed systematic approach toward achieving an effective, efficient management should help in improving the patients' long-term outcome.