Impact of Bone Volume Upon Condylar Activity in Patients With Unilateral Condylar Hyperplasia

Luc H E Karssemakers, Jitske W Nolte, D Bram Tuinzing, Geerling E J Langenbach, Alfred G Becking, Pieter G Raijmakers

Research output: Contribution to journalArticleAcademicpeer-review


PURPOSE: Unilateral condylar hyperplasia or hyperactivity (UCH) is a bone overgrowth disorder affecting the mandible. The purpose of this study was to determine the relations among age, condylar bone structure, condylar bone volume, and condylar bone activity on single-photon emission computed tomographic (SPECT) scans in patients with UCH.

MATERIALS AND METHODS: This study included 20 patients with a clinical presentation of progressive mandibular asymmetry and a positive bone SPECT scan. A bone SPECT-derived standardized uptake value (bSUV) for the condylar region was determined. All patients underwent condylectomy to arrest further progression of the disease. The resected condyles were scanned with a micro-computed tomographic scanner (18-μm resolution). Bone architectural parameters were calculated with routine morphometric software.

RESULTS: The mean bSUV of the condyle on the affected side was 15.32 (standard deviation [SD], 8.98) compared with 9.85 (SD, 4.40) on the nonaffected side (P = .0007). For trabecular bone structure, there was a nonsignificant correlation between the SUV of the affected condyle and the measured bone volume fraction (r = 0.13; P = .58) and trabecular thickness (r = 0.03; P = .90).

CONCLUSION: No meaningful relation was found between condylar bone volume fraction and condylar activity on bone scan; therefore, the impact of bone volume fraction on the results of bone scans is limited. The measured condylar activity on SPECT scan seems to be primarily a reflection of the remodeling rate of bone.

Original languageEnglish
Pages (from-to)2177-2182
Number of pages6
JournalJournal of Oral and Maxillofacial Surgery
Issue number10
Publication statusPublished - Oct 2018

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