Background: Chronic ankle instability (CAI) is common sequelae of lateral ankle sprains characterized by recurrent episodes of giving way, impaired proprioception, reduced balance, neuromuscular deficits, and restricted ankle dorsiflexion range of motion (ROM). Approximately one-third of individuals sustaining an ankle sprain develop persistent instability and functional limitations. Current rehabilitation approaches emphasize neuromuscular training, balance exercises, and manual therapy interventions. Fascial Distortion Model (FDM) and Instrument-Assisted Soft Tissue Mobilization (IASTM) are increasingly used in clinical practice; however, evidence directly comparing these interventions in CAI remains limited.

Objective of this Study: To compare the effectiveness of Fascial Distortion Model combined with Balance Strength Training (BST) and Instrument-Assisted Soft Tissue Mobilization combined with Balance Strength Training in improving balance and ankle dorsiflexion ROM among individuals with chronic ankle instability.

Materials and Methods: A comparative pre-test and post-test experimental study was conducted among 40 participants with chronic ankle instability. Participants were allocated into two groups (n=20 each). Group A received Fascial Distortion Model and Balance Strength Training, while Group B received Instrument-Assisted Soft Tissue Mobilization and Balance Strength Training. The intervention was administered for four weeks. Balance was assessed using the Flamingo Balance Test, and ankle dorsiflexion ROM was measured using a universal goniometer. Statistical analysis was performed using paired and unpaired t-tests.

Results: Both groups demonstrated statistically significant improvements in balance and ankle dorsiflexion ROM following intervention (p<0.005). Group A exhibited greater improvement in balance compared with Group B (mean difference 6.25 vs. 4.25; t=3.782). Significant improvements in ankle dorsiflexion ROM were also observed, with between-group analysis favoring Group A (t=3.944).

Conclusion: Both interventions effectively improved balance and ankle dorsiflexion ROM in individuals with chronic ankle instability. However, Fascial Distortion Model combined with Balance Strength Training demonstrated superior clinical outcomes and may represent a more effective rehabilitation strategy for individuals with CAI.