In chronic hemiplegic individuals, gait loss due to biomechanical disorders of the talocrural joint (TCJ) and subtalar joint (STJ) affects 50% of the population. Although foot posture is seen at the same rate in pronation and supination, approximately 30% of individuals have abnormal and asymmetric foot posture. In particular, foot posture in the direction of plantar flexion and inversion leads to limited ankle mobility. Loss of mobility can be caused by non-neural factors as well as neural factors such as spasticity and increased myostatic reflex. Due to long-term immobilization, negative changes are seen in the tissues such as bone, muscle, tendon and ligament and especially ankle dorsiflexion is limited. Limited ankle dorsiflexion adversely affects the weight bearing capacity, increases the knee extensor moment and causes insufficient maneuvers to change the center of gravity of the body in patients with hemiplegia. The main problem is the timing of the posterior foot plantar flexion after the first contact at the beginning of the posture phase; in the late phase, defective heel and forefoot rocker roll mechanism due to the failure of forward weight transfer. For these reasons, foot posture, ankle joint range of motion and balance are adversely affected in hemiplegic individuals. Biomechanical problems related to foot deformities in chronic hemiplegic individuals have been frequently associated with TCJ and STJ anomalies. However, in biomechanical studies, it is emphasized that proximal tibiofibular joint (PTFJ) and distal tibiofibular joint (DTFJ) have important roles in optimal ankle dorsiflexion. Although PTFJ is anatomically belonging to the knee, it is evaluated within the foot-ankle complex as a function. PTFJ makes slip movements during movement in TCJ. Limitations in PTFJ movement result in limitation of the endpoints of normal ankle joint movement and anterior pain in the ankle during weight bearing. Increased tension in the lateral ligaments due to plantar flexion and inversion anomalies and traumas of the ankle applies inferior directional traction force to the distal fibula.This leads to fibular rotation in the parasagittal plane. Anterior and inferior movement of the distal fibula causes inferior and posterior shifting of the PTFJ and the PTFJ locks. This locking restricts the movement of the entire fibula during ankle movements and leads to a limitation of dorsiflexion of TCJ. It is emphasized that ankle posture significantly affects DTFJ in addition to PTFJ. The anterior ligament of DTFJ is closely related to the anterior talofibular ligament (ATFL). Plantar flexion and inversion of the trauma or supination of the foot posture, etc. conditions increase the tension in the lateral ligaments and cause pathologies in ATFL. This situation adversely affects the anterior ligament of DTFJ, leading to instability risk in this joint and loss of dorsiflexion in TCJ. While biomechanical studies emphasized the importance of proximal tibiofibular joint and distal tibiofibular joint manipulations for ankle dorsiflexion, no studies examining the effect of corrective manipulation techniques applied to these two joints on foot posture, range of motion and balance were observed. It is thought that PTFJ and DTFJ also have an effect on the above mentioned biomechanical chain in functional deficiencies caused by foot posture in the direction of plantar flexion and inversion. Therefore, we aimed to investigate the effects of PTFJ and DTFJ manipulation techniques on foot posture, range of motion and balance parameters in chronic hemiplegic subjects.
Limited ankle dorsiflexion adversely affects the weight bearing capacity, increases the knee extensor moment and causes insufficient maneuvers to change the center of gravity of the body in patients with hemiplegia. While biomechanical studies emphasized the importance of proximal tibiofibular joint and distal tibiofibular joint manipulations for ankle dorsiflexion, no studies examining the effect of corrective manipulation techniques applied to these two joints on foot posture, range of motion and balance were observed.