User releases Point Partial(s) while performing an active grasp by pressing the dorsal button (Pass/Fail). This validation method was used to confirm the following user need of the Point Partial has been met: Point Partial shall be releasable while performing active grasps. A simple pass/fail result was recorded for each user need for each participant. An overall passing rate above 80% across all user needs and participants is considered a success. Each participant attended a single-day experimental session. A day-use prosthetic socket was fabricated and Point Partials were mounted to the socket. Then, each participant attempted the validation test.

User positions Point Partial(s) into each of the locking positions (Pass/Fail). This validation method was used to confirm the following user need of the Point Partial has been met: Point Partial shall have a smooth ratcheting mechanism. A simple pass/fail result was recorded for each user need for each participant. An overall passing rate above 80% across all user needs and participants is considered a success. Each participant attended a single-day experimental session. A day-use prosthetic socket was fabricated and Point Partials were mounted to the socket. Then, each participant attempted the validation test.

User activates spring-back mechanism by using (1) contralateral hand, (2) tabletop, and (3) side or thigh throughout day without failed extension (Pass/Fail). This validation method was used to confirm the following user need of the Point Partial has been met: Point Partial shall have a reliable auto spring-back mechanism. A simple pass/fail result was recorded for each user need for each participant. An overall passing rate above 80% across all user needs and participants is considered a success. Each participant attended a single-day experimental session. A day-use prosthetic socket was fabricated and Point Partials were mounted to the socket. Then, each participant attempted the validation test.

User grips a 5 lb. cylindrical smooth object using Point Partial(s) for 10 seconds (Pass/Fail). This validation method was used to confirm the following user need of the Point Partial has been met: Point Partial shall have high grip surface friction. A simple pass/fail result was recorded for each user need for each participant. An overall passing rate above 80% across all user needs and participants is considered a success. Each participant attended a single-day experimental session. A day-use prosthetic socket was fabricated and Point Partials were mounted to the socket. Then, each participant attempted the validation test.

User picks up 1 coin from a smooth tabletop (Pass/Fail). This validation method was used to confirm the following user need of the Point Partial has been met: Point Partial shall have a pronounced fingernail. A simple pass/fail result was recorded for each user need for each participant. An overall passing rate above 80% across all user needs and participants is considered a success. Each participant attended a single-day experimental session. A day-use prosthetic socket was fabricated and Point Partials were mounted to the socket. Then, each participant attempted the validation test.

User performs VAL-1 through VAL-8 (Pass/Fail). This validation method was used to confirm the following user need of the Point Partial has been met: Point Partial shall be robustly attached to mounting system. A simple pass/fail result was recorded for each user need for each participant. An overall passing rate above 80% across all user needs and participants is considered a success. Each participant attended a single-day experimental session. A day-use prosthetic socket was fabricated and Point Partials were mounted to the socket. Then, each participant attempted the validation test.

User flexes and extends the Point Partial(s) without using contralateral hand (Pass/Fail). This validation method was used to confirm the following user need of the Point Partial has been met: Point Partial shall allow the user to flex and extend finger without their second hand. A simple pass/fail result was recorded for each user need for each participant. An overall passing rate above 80% across all user needs and participants is considered a success. Each participant attended a single-day experimental session. A day-use prosthetic socket was fabricated and Point Partials were mounted to the socket. Then, each participant attempted the validation test.

User lifts a 25 lb. bag with Point Partial(s) (Pass/Fail). This validation method was used to confirm the following user need of the Point Partial has been met: Point Partial shall be robust enough to operate in challenging environments. A simple pass/fail result was recorded for each user need for each participant. An overall passing rate above 80% across all user needs and participants is considered a success. Each participant attended a single-day experimental session. A day-use prosthetic socket was fabricated and Point Partials were mounted to the socket. Then, each participant attempted the validation test.

User grips a hammer with Point Partial(s) and drives a nail into a piece of wood (Pass/Fail). This validation method was used to confirm the following user need of the Point Partial has been met: Point Partial shall be robust enough to operate in challenging environments. A simple pass/fail result was recorded for each user need for each participant. An overall passing rate above 80% across all user needs and participants is considered a success. Each participant attended a single-day experimental session. A day-use prosthetic socket was fabricated and Point Partials were mounted to the socket. Then, each participant attempted the validation test.

User releases Point Partial(s) while performing an active grasp by pressing the dorsal button (Pass/Fail). This validation method was used to confirm the following user need of the Point Partial has been met: Point Partial shall be releasable while performing active grasps. A simple pass/fail result was recorded for each user need for each participant. An overall passing rate above 80% across all user needs and participants is considered a success. Each participant attended a single-day experimental session. A day-use prosthetic socket was fabricated and Point Partials were mounted to the socket. Then, each participant attempted the validation test.

User positions Point Partial(s) into each of the locking positions (Pass/Fail). This validation method was used to confirm the following user need of the Point Partial has been met: Point Partial shall have a smooth ratcheting mechanism. A simple pass/fail result was recorded for each user need for each participant. An overall passing rate above 80% across all user needs and participants is considered a success. Each participant attended a single-day experimental session. A day-use prosthetic socket was fabricated and Point Partials were mounted to the socket. Then, each participant attempted the validation test.

User activates spring-back mechanism by using (1) contralateral hand, (2) tabletop, and (3) side or thigh throughout day without failed extension (Pass/Fail). This validation method was used to confirm the following user need of the Point Partial has been met: Point Partial shall have a reliable auto spring-back mechanism. A simple pass/fail result was recorded for each user need for each participant. An overall passing rate above 80% across all user needs and participants is considered a success. Each participant attended a single-day experimental session. A day-use prosthetic socket was fabricated and Point Partials were mounted to the socket. Then, each participant attempted the validation test.

User grips a 5 lb. cylindrical smooth object using Point Partial(s) for 10 seconds (Pass/Fail). This validation method was used to confirm the following user need of the Point Partial has been met: Point Partial shall have high grip surface friction. A simple pass/fail result was recorded for each user need for each participant. An overall passing rate above 80% across all user needs and participants is considered a success. Each participant attended a single-day experimental session. A day-use prosthetic socket was fabricated and Point Partials were mounted to the socket. Then, each participant attempted the validation test.

User picks up 1 coin from a smooth tabletop (Pass/Fail). This validation method was used to confirm the following user need of the Point Partial has been met: Point Partial shall have a pronounced fingernail. A simple pass/fail result was recorded for each user need for each participant. An overall passing rate above 80% across all user needs and participants is considered a success. Each participant attended a single-day experimental session. A day-use prosthetic socket was fabricated and Point Partials were mounted to the socket. Then, each participant attempted the validation test.

User performs VAL-1 through VAL-8 (Pass/Fail). This validation method was used to confirm the following user need of the Point Partial has been met: Point Partial shall be robustly attached to mounting system. A simple pass/fail result was recorded for each user need for each participant. An overall passing rate above 80% across all user needs and participants is considered a success. Each participant attended a single-day experimental session. A day-use prosthetic socket was fabricated and Point Partials were mounted to the socket. Then, each participant attempted the validation test.