Group 1 (amputated individuals with phantom sensation) inclusion criteria:  Having an acceptable (non-irritating) phantom sensation that persists throughout the day, even if the severity is variable Having unilateral below-knee amputation due to trauma Using OttoBock® prosthesis with dynamic foot component, silicone liner design and active vacuum system: The reason for choosing this prosthesis; This is because it is a prosthesis documented in the literature, with the highest standards of use in today's conditions, the most preferred in the international platform, used in research, and advantageous for use in daily life. Thus, deficiencies that may arise from the design of the prosthesis will not be encountered. At least 2 years have passed since amputation surgery Using the last prosthesis for at least 6 months for at least 6-8 hours a day Being within the limits of body mass index (weight/height2: 18.5-24.9 kg/m2) accepted as normal by the World Health Organization Having the ability to speak and understand Turkish Not having any balance and coordination difficulties that can be observed with clinical functional tests Not having any joint contracture or muscle shortness that may affect walking ability Agree to participate in the study  Group 1 (amputated individuals with phantom sensation) exclusion criteria:  Undergoing amputation surgery for non-traumatic reasons Having multiple amputations To be followed up with any medical pre-diagnosis (orthopedic, neurological, cardiovascular, psychiatric, etc.) To be followed up with any medical diagnosis (orthopedic, neurological, cardiovascular, psychiatric, etc.) Being on medication during the research Having consumed alcohol in the last 48 hours Taking painkillers in the last 48 hours Having a history of surgery and acute trauma in the last 6 months Having a history of falling in the last 1 year Loss of sensation in the remaining limb (stump) after amputation Having a disturbing phantom feeling Having any chronic and/or acute pain, including phantom pain and stump pain Observing any shortness, contracture or balance problems in the pre-tests  Group 2 - (amputated individuals without phantom sensation) inclusion criteria:  Having unilateral below-knee amputation due to trauma Volunteering to participate in the study Using OttoBock® prosthesis with dynamic foot component, silicone liner design and active vacuum system (Picture 1) At least 2 years have passed since amputation surgery Using the last prosthesis for at least 6 months for at least 6-8 hours a day Being within the limits of body mass index (weight/height2: 18.5-24.9 kg/m2) accepted as normal by the World Health Organization Having the ability to speak and understand Turkish Absence of phantom sensation at any time and movement in the last 4 weeks  Group 2 - (amputated individuals without phantom sensation) exclusion criteria:  Undergoing amputation surgery for non-traumatic reasons Having multiple amputations To be followed up with any medical pre-diagnosis (orthopedic, neurological, cardiovascular, psychiatric, etc.) To be followed up with any medical diagnosis (orthopedic, neurological, cardiovascular, psychiatric, etc.) Being on medication during the research Having consumed alcohol in the last 48 hours Taking painkillers in the last 48 hours Having a history of surgery and acute trauma in the last 6 months Having a history of falling in the last 1 year Loss of sensation in the remaining limb (stump) after amputation Having a phantom feeling Having any chronic and/or acute pain, including phantom pain and stump pain Observing any shortness, contracture or balance problems in the pre-tests  Group 3 - (healthy volunteers) inclusion criteria:  Being within the limits of body mass index (weight/height2: 18.5-24.9 kg/m2) accepted as normal by the World Health Organization Having the ability to speak and understand Turkish Agree to participate in the study  Group 3 - (healthy volunteers) exclusion criteria:  To be followed up with any medical pre-diagnosis (orthopedic, neurological, cardiovascular, psychiatric, etc.) To be followed up with any medical diagnosis (orthopedic, neurological, cardiovascular, psychiatric, etc.) Being on medication during the research Having consumed alcohol in the last 48 hours Taking painkillers in the last 48 hours Having a history of surgery and acute trauma in the last 6 months Having a history of falling in the last 1 year Observing any shortness, contracture or balance problems in the pre-tests