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Abstract Background: FHP is considered a widely spread postural disorder among post-pubertal females and it is related to Nasorespiratory obstruction, Masticatory muscles dysfunction and abnormalities in Temporomandibular joint (TMJ) structure results in Temporomandibular Disorders (TMDs). Although there were a lot of studies about the close association between FHP and TMDs and the triad of dysfunction which incorporates Myofascial pain and dysfunction, internal derangement of the TMJ and cervical spine dysfunction, till now, no study have been showed effect of FHP on TMJ proprioception in post-pubertal females. Purpose: This observational cross-sectional study was conducted to investigate the effect of FHP on Temporomandibular joint (TMJ) proprioception in post-pubertal females. Material and Method: Fifty-six post-pubertal females were recruited from undergraduate students of Faculty of Physical Therapy, Cairo University and assigned according to Cranivertebral angle (CVA) into two groups. group A: 23 females without FHP, have normal CVA >48 and group B: 33 females with FHP, CVA<48 and use photographic analysis to measure shoulder angle and use Vernier caliper to measure TMJ repositioning accuracy in different directions (mouth opening, protrusion and lateral movements of jaw including right and left deviation) with open and closed eyes three times |