Early Weight-Bearing After Lapidus Arthrodesis

Each subject will undergo a Lapidus Arthrodesis which entails cartilage removal from the 1st
TMT joint, subchondral bone preparation, deformity correction, temporary fixation and
permanent fixation with the Phantom™ Intramedullary Nail. The Phantom™ Intramedullary Nail is
inserted by drilling a hole for the nail at a specified location using instrumentation and a
targeting guide. The nail is inserted into the drill hole and is fixated to the medial
cuneiform and 1st metatarsal using three threaded pegs and a locking screw.

A subchondral drill and chisel are provided in the system with the Lapidus Nail. Subchondral
drilling and feathering of the subchondral bone with a chisel are standard ways to prepare
the subchondral bone and elicit bleeding bone prior to arthrodesis. Use of this
instrumentation is encouraged for this study to ensure that proper bone preparation is
performed for arthrodesis. A torque indicating driver is also encouraged to be used for this
procedure to help guide the surgeon to appropriate compression to apply across the joint.
Alternatively, a standard driver and handle can be used with two-finger tightness when
compressing the joint to achieve a similar effect.

Traditionally, it is common for people who undergo a Lapidus Arthrodesis to be
non-weight-bearing for 6-8 Weeks following the surgical procedure. This time allows the bones
to properly fuse together. During this 6-8 week period, people can be limited in the typical
day-to-day activities they participate in, such as walking, shopping and working.

The Phantom™ Intramedullary Nail may allow subjects to bear weight earlier than traditional
procedures without negatively effecting fusion. By allowing people to bear weight earlier
than traditional methods, it is possible that people will have the opportunity to resume
typical day-to-day activities faster than usual.

The study in question will investigate the Phantom™ Intramedullary Nail with the following
early weight-bearing protocol (see "Post-Operative Protocol for Study Participant" below).

The study preference is that subjects are placed in a splint from 0-2 Weeks. However, a cast
may be substituted according to surgeon preference. No casts are permitted beyond 2 Weeks,
unless deemed as a medical necessity in which case the subject would no longer follow the
early weight-bearing protocol.

The study preference is that subject will be placed in a walking boot at 2 Weeks. However, an
immobilizing shoe may be substituted according to surgeon preference.

Post-Operative Protocol for Study Participant

Activity Level Definitions:

Sedentary: Most activities are done seated or lying down. Surgically repaired foot should be
raised when in seated or reclined position. Standing limited to less than 15 minutes per
hour. Moving is limited to necessary activities such as going to the bathroom or food
preparation.

Light Activity: Standing limited to less than 30 minutes per hour. Movement is mostly limited
to in-home movement such as folding laundry or wiping counters. Short time periods of
movement to leave the house can be performed for necessary activities (such as the grocery
store), but should be limited to less than 30 minutes of standing time.

Moderate Activity: No limits on standing. Walking limited to 45 minute time periods no more
than 3 times per day. No running, jumping or heavy lifting (more than 25 pounds).

Heavy Activity: No limits on walking, running and jumping. No lifting limits.

0-2 Weeks After Surgery:

- Footwear: You will have a splint (or cast) on your surgically repaired foot/leg. The
splint (or cast) should not be removed. You will wear a comfortable shoe on the other
foot.

- Weight-Bearing: Do not put any weight on your surgically repaired foot.

- Mobility Aid: You will use a walking aid such as crutches, rolling knee scooter or
wheelchair to keep all weight off of your surgically repaired foot.

- Range of Motion Exercises: None.

- Activity level: Sedentary after surgery working up to light activity over two Weeks
(restarting activities of daily living without putting weight on your foot).

2-6 Weeks After Surgery:

- Footwear: A restrictive boot (or shoe) will be given to you by your doctor. This should
not be removed other than for range of motion exercises and bathing (seated). Wear a
comfortable shoe on the other foot.

- Weight-Bearing: Put weight on your foot as you can tolerate in the restrictive boot (or
shoe). Do not walk without the restrictive boot (or shoe).

- Mobility Aid: If possible, no walking aid should be used. If needed for pain, use a
walking aid as necessary.

- Range of Motion Exercises: You will do range of motion exercises without the restrictive
boot (or shoe) with no weight on your foot, as instructed by your doctor.

- Activity level: Light activity with restrictive boot (or shoe). 6 Weeks-3 Months After
Surgery:

- Footwear: You will wear a restrictive boot (or shoe) working up to supportive shoe
(preferably a lace-up or Velcro shoe including sneakers, running shoes, work boots or
soft leather shoes without a heel) by 8 Weeks after your surgery.

- Weight-Bearing: Put weight on your foot as you can tolerate. Barefoot walking is not
encouraged.

- Mobility Aid: No help from crutches, scooter, or wheelchair.

- Range of Motion Exercises: You will do range of motion exercises as instructed by your
doctor.

- Activity level: Light activity working up to moderate activity (low impact) as you can
tolerate.

3-6 Months After Surgery:

- Footwear: At Month 3-4, move from a supportive shoe to footwear of your choice, as you
can tolerate.

- Weight-Bearing: Put weight on your foot as you can tolerate.

- Mobility Aid: No help from crutches, scooter, or wheelchair.

- Activity level: Moderate activity for 3-4 Months post-operative, slowly moving into
heavy activity as you can tolerate after Month 4.

6 Months - 2 Years After Surgery:

- Footwear: You have no restrictions on footwear.

- Weight-Bearing: Put weight on your foot as you can tolerate.

- Mobility Aid: No help from crutches, scooter, or wheelchair.

- Activity Level: No activity limits.

Inclusion Criteria:

- The subject is at least 18 years of age with closed physeal plates at the time of
screening.

- The intermetatarsal angle is greater than or equal to 10 degrees.

- The hallux valgus angle is greater than or equal to 25 degrees.

- The subject has foot pain/discomfort on the foot in question.

- The subject has activity limitations due to the foot in question.

- The subject agrees to comply with the requirements of the study and complete the study
measures.

- The subject is willing and able to provide written informed consent.

Exclusion Criteria:

- The subject is pregnant.

- The subject is a current smoker.

- The subject has been clinically diagnosed with diabetes.

- The subject has been clinically diagnosed with peripheral neuropathy.

- The subject had been previously sensitized to titanium.

- The subject currently takes oral steroids or rheumatoid biologics.

- The subject has had previous surgery for hallux valgus on operative side.

- The subject has insufficient quantity or quality of bone to permit stabilization,
conditions that retard healing (not including pathological fractures) and conditions
causing poor blood supply such as peripheral vascular disease.

- The subject has a history of delayed or non-union for fracture or joint.

- The subject has an active, suspected or latent infection in the affected area.

- The subject will require a structural graft in the 1st TMT joint.

- The subject is scheduled to undergo a concomitant 2nd tarsometatarsal joint
arthrodesis procedure.

- The subject is scheduled to undergo a same-day bilateral procedure.

- The subject cannot be scheduled for surgery within 3 months of the pre-operative exam.

- The subject has previously been enrolled into this study for a contralateral
procedure.

- The subject is actively involved with a Workman's Compensation case.

- The subject is not expected to complete the study according to the investigation plan.

- The subject has been deemed physiologically or psychologically inadequate by the
enrolling physician.

- The subject is: a prisoner, unable to understand what participation in the study
entails, mentally incompetent, a known abuser of alcohol and/or drugs or anticipated
to be non-compliant.