A Preliminary Study of Ankle Single Photon Emission Computed Tomography/Computed Tomography in Patients With Bony Impingement Syndrome: Association With the Visual Analogue Scale Pain Score.

Both osteoarthritis and impingement syndrome are the disorders commonly observed in sports medicine. However, failure in pain alleviation by surgical intervention introduces challenges in the diagnosis and decision-making for orthopedists. Hybrid single photon emission computed tomography/computed tomography (SPECT/CT) provides both functional and structural information of ankle pathology. The purpose of this retrospective study was to evaluate whether bone tracer uptake by ankle SPECT/CT is related to the lesion type and visual analog scale (VAS) pain score for patients with osteoarthritis and bony impingement. Fifty individuals with chronic ankle pain who underwent pretreatment ankle SPECT/CT were included in the current study. The median follow-up period was 2.5 (range 1.8 to 3.2) years. The lesion types were categorized by the positions of anatomical changes and bone tracer uptake. The VAS pain score was recorded 2 weeks before and 1.5 year after surgical intervention. Twenty-nine (58%) of 50 patients had osseous impingement. Among them, 16 (55.2%), 4 (13.8%), and 9 (31%) patients had anterior, posterior, and both types of ankle impingement, respectively. The uptake grade of bone tracer was significantly related to the lesion type of ankle impingement (p < .001). The VAS pain score was significantly correlated with bone tracer uptake before treatment (p < .001). Bone tracer uptake was related to the lesion type of impingement detected by SPECT/CT and was confirmed by surgical findings. The VAS pain score was significantly correlated with the bone tracer uptake. Preoperative ankle SPECT/CT may be helpful to clinically correlate the VAS pain score in the pre- and postsurgical periods for patients with osteoarthritis and bony impingement syndrome.