Excision of heterotopic ossification from the knee: a functional outcome study

We retrospectively reviewed 17 consecutive patients with neurologic injuries (22 knees) who had excision of heterotopic ossification (22 knees, five bilateral) of the knees. Our primary research goal was to determine the change in range of motion at the knee after resection of heterotopic ossification in patients with neurologic injuries. Our secondary research goal was to determine the mobility gains measured regarding ambulatory and sitting functions for these patients. Diagnoses included traumatic brain injury (15 patients), anoxia (one patient), and spinal cord injury (one patient). The average age of the patients was 33 years (range, 19-51 years). Data were collected by an independent observer and included range of motion of the knee, ambulatory ability according to a five-level scale, and sitting ability according to a three-level scale. The average followup was 32 months. Range of motion improved by 65 degrees postoperatively. Extension improved from a preoperative mean of 16 degrees to a postoperative mean of 2 degrees . Flexion improved from a preoperative mean of 57 degrees to a postoperative mean of 107 degrees . Ambulatory and sitting function improved as a result of treatment. Surgical excision of heterotopic ossification of the knee is an effective procedure to increase joint mobility and function.

Therapeutic study, Level IV (case series-no, or historical control group). See the Guidelines for Authors for a complete description of levels of evidence.