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Zimmer Biomet Headless Compression
and Twist-Off Screws Скачать руководство пользователя страница 11

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Headless Compression and Twist-Off Screws

Surgical Technique

Insertion

Load the screw onto the T7 Cannulated Driver and Mini
Rachet Handle. Place screw over the 0.9 mm k-wire
down to surface of bone. Advance the screw into
bone by turning the T7 Cannulated Driver clockwise.
Continue advancing until the head of the screw is at
or just below the near cortex. After compression is
achieved, remove the T7 Cannulated Driver and 0.9
mm k-wire. Verify screw position with fluoroscopy.

Screw Removal

For screw removal, insert the T7 Solid Driver into the
head of the screw, and turn the Driver counterclockwise
until the screw is removed.

2.0 x 65 mm Cann Drill Bit AO 110027744

Compatible with the
70 mm and longer k-wires

2.0 x 80 mm Cann Drill Bit AO 110018532

compatible with the
105 mm and longer k-wires

2.5 mm Head Relief Drill AO
110027746

3.0 mm Head Relief Drill AO
110027747

Headless Compression Screw Technique – Bicortical Applications

Figure 11

Drilling (Optional)

(cont.)

In situations where bi-cortical lagging is required (such
as a Scarf-Z Osteotomy), use the 2.0 mm Cannulated
AO Drill for preparation of the far cortex (Figure 11).

The medial cortical shelf and metatarsal head are then
osteotomized and rasped to a smooth contour.

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Содержание Headless Compression and Twist-Off Screws

Страница 1: ...Headless Compression and Twist Off Screws Surgical Technique ...

Страница 2: ......

Страница 3: ...cal Applications 4 Osteotomy 4 K Wire Placement 5 Screw Measurement 6 Insertion 7 Drilling Optional 7 Screw Removal 7 Bicortical Osteotomy 8 K Wire Placement 8 Drilling Optional 8 Insertion 9 Screw Removal 9 Twist Off Screw 10 Surgical Approach 11 Osteotomy 11 Insertion 12 Final Step 14 Ordering Information 15 Indications and Contraindications 17 ...

Страница 4: ...ue 2 5 mm 10 40 mm 2 mm increments 3 0 mm 10 40 mm 2 mm increments Tapered Threads 0 9 mm Cobalt Chrome K Wire T7 Hexalobe Drive Four Cutting Edges TiMAX Titanium 1 8 mm minor diameter designed for increased strength over prior screw1 Headless Compression Screws ...

Страница 5: ... the dorsal aspect of the first metatarsophalangeal joint just medial and parallel to the EHL tendon The incision is carried down to the subcutaneous tissues Figure 2 Retract the soft tissues carefully being certain to protect the neurovascular bundle in the skin flap Lateral Release If necessary a standard lateral release is performed through the same incision This includes the release of the add...

Страница 6: ...rt a 0 9 mm k wire perpendicular into the center of the first metatarsal head Figure 3a A medially based long arm Chevron type osteotomy is then created from medial to lateral Remove the k wire The capital fragment is then mobilized and transposed laterally to correct the 1st IMA and impacted on the 1st metatarsal shaft Figure 3b Figure 3 Figure 3b Figure 3a Headless Compression Screw Technique Un...

Страница 7: ... 4 mm from the depth gauge measurement to avoid penetrating the articular cartilage with the distal tip of the screw For example if the measurement is 20 mm then select the 16 mm screw Tip When using a screw longer than 28 mm for oblique applications it may be beneficial to use a 0 9 mm x 105 mm k wire Tip For hammertoe applications a sterile double tipped 0 9 mm x 152 mm k wire is available for o...

Страница 8: ...crew length may vary depending upon the level of obliquity applied to the k wire during insertion To determine the screw length and with the obliquity of the k wire in mind record the measurement Using the K Wire Obliquity Chart below subtract the corresponding milimeters from the recorded measurement Figure 5 It is recommended that each screw length be verified off the screw caddy measurement slo...

Страница 9: ...ote The Zimmer Biomet Headless Compression screws are designed to be self drilling and self tapping and may be inserted under power If the bone is deemed to be too hard prior to screw insertion or an oblique approach is required use a Head Relief Drill to prepare the near cortex For the 2 5 mm screw use the 2 5 mm Head Relief Drill and for the 3 0 mm screw use the 3 0 mm Head Relief Drill Figure 8...

Страница 10: ... the 2 5 mm Head Relief Drill and for the 3 0 mm screw use the 3 0 mm Head Relief Drill Figure 10 Headless Compression Screw Technique Bicortical Applications Figure 9 K Wire Placement For bi cortical applications such as the Scarf Z or Ludloff osteotomy insert the k wire until the tip begins to exit the outer wall of the far cortex Figure 9 Screw measurement subtraction is not necessary for bi co...

Страница 11: ...ert the T7 Solid Driver into the head of the screw and turn the Driver counterclockwise until the screw is removed 2 0 x 65 mm Cann Drill Bit AO 110027744 Compatible with the 70 mm and longer k wires 2 0 x 80 mm Cann Drill Bit AO 110018532 compatible with the 105 mm and longer k wires 2 5 mm Head Relief Drill AO 110027746 3 0 mm Head Relief Drill AO 110027747 Headless Compression Screw Technique B...

Страница 12: ...rements 2 7 mm Screw 8 mm 16 mm 1 mm increments 18 24 mm 2 mm increments Expanded shaft length over previous design for use with pin drivers 3 point head engagement designed for stable driving Cortical threads Cancellous threads Cutting tip designed to maximize far cortex purchase Twist Off Screws ...

Страница 13: ...nt Placing one Hohmann retractor on each side of the metatarsal should make this maneuver much easier The use of a spreader helps to ensure a safe osteotomy by providing adequate protection Osteotomy The osteotomy is made horizontal and parallel to the sole It starts in the cartilage of the head near the dorsal margin and should be at least 2 5 cm long Figure 2 Caution The direction of the cut sho...

Страница 14: ...hat it is sitting flush with the bone The depth gauge displays the measurement from the distal tip of the depth gauge to the top of the k wire Figure 3 Figure 5 Insertion Hold the head against the metatarsal with the forefinger The placement of a dorsal clamp aids in accurate head positioning and desired fixation Using the Pin Driver on the Twist Off Screw drive the screw into the bone slowly unde...

Страница 15: ...ting the Twist Off Screw in osteoporotic bone stop advancing the screw before the head engages the near cortex Place the mosquito clamp against the screw below the head applying pressure while bending the pin driver towards the mosquito clamp Figure 7 until the shaft breaks off from the screw head Place the Twist Off Finishing Driver on the Mini Rachet Handle and finish screw placement by hand Fig...

Страница 16: ...shortening Z shaped release of extensor muscles is often necessary Close the incision Note The 2 0 mm Twist Off Screw is designed with cortical threads while the 2 7 mm Twist Off Screw has cancellous threads for use in softer bone and is designed for increased purchase Figure 10 Figure 9 Figure 10 2 0 mm Cortical 2 7 mm Cancellous Twist Off Screw Technique ...

Страница 17: ... Sterile Description 110018424 110018425 110018426 110018427 110018428 110018429 110018430 HCS Screw 2 5 x 28 PT HCS Screw 2 5 x 30 PT HCS Screw 2 5 x 32 PT HCS Screw 2 5 x 34 PT HCS Screw 2 5 x 36 PT HCS Screw 2 5 x 38 PT HCS Screw 2 5 x 40 PT 3 0 mm Screws Fully Threaded Non Sterile Description 110018448 110018449 110018450 110018451 110018452 110018453 110018454 110018455 110018456 110018457 11...

Страница 18: ... Twist Off Screw 2 7 x 14 Twist Off Screw 2 7 x 15 Twist Off Screw 2 7 x 16 Twist Off Screw 2 7 x 18 Twist Off Screw 2 7 x 20 Twist Off Screw 2 7 x 22 Twist Off Screw 2 7 x 24 Included in tray Implants Twist Off Screws Instruments Disposables Instruments Non Sterile Description 110018531 110018535 PA017 110018537 110018541 PA720 110017406 110018539 110018538 110018561 110018562 T7 Driver Cannulate...

Страница 19: ... hand In the foot these include procedures to correct Hallux Valgus bunions Hallux Varus and Hallux Rigidus Hammer toe Claw toe and Mallet toe CONTRAINDICATIONS 1 Infections 2 Patient conditions including blood supply limitations insufficient quantity or quality of bone 3 Patients with mental or neurologic conditions who are unwilling or incapable of following postoperative care instructions 4 For...

Страница 20: ...erbiomet com This technique was prepared in conjunction with a licensed health care professional Zimmer Biomet does not practice medicine and does not recommend any particular orthopedic implant or surgical technique for use on a specific patient Information on the products and procedures contained in this document are of a general nature and does not constitute medical advice or recommendations T...

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