Orthopedics insteuments

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orthopedic surgical instruments overview

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Here is a comprehensive overview of common orthopedic surgical instruments, organized by category and function:

Orthopedic Surgical Instruments — Overview

1. Cutting Instruments

These instruments are used to cut, shape, or remove bone and soft tissue.

Instrument	Description & Use
Osteotome	A chisel-like instrument used to cut or shape bone. Available in straight and curved designs. Used with a mallet.
Bone Saw (Oscillating/Reciprocating)	Power saw used for precise bone cuts, e.g., in joint arthroplasty (TKA, THA), amputations, and osteotomies.
Rongeur	Hinged, jaw-like instrument for nibbling/removing small pieces of bone or cartilage (e.g., in spinal surgery, joint debridement).
Bone Curette	Spoon-shaped instrument to scoop out bone or soft tissue from cavities; used in bone grafting and tumor excision.
Mallet	Heavy hammer used with osteotomes and chisels to deliver controlled force to bone.
Gigli Saw	Flexible wire saw used for cutting bone in tight spaces (e.g., amputation, pelvic osteotomy).
Periosteal Elevator	Flat-edged instrument to strip periosteum from bone surface before cutting or fixation.

Osteotome used in calcaneal bone tumor resection alongside a fork retractor

Osteotome (right) with fork retractor (left) during calcaneal osteochondroma excision

2. Holding & Grasping Instruments

Used to grip, hold, or stabilize bone fragments and tissue.

Instrument	Description & Use
Bone-Holding Forceps	Self-retaining or handheld forceps used to grip bone fragments during reduction and fixation.
Reduction Forceps (Pointed / Ball-Spike Clamps)	Used to achieve and temporarily maintain fracture reduction before definitive fixation (e.g., in ORIF).
Towel Clamps	Used to hold drapes in place and occasionally to grasp bone.
Tissue Forceps (Adson, Allis)	For grasping soft tissue during exposure.

$Reduction forceps and retractors during ORIF of scapular spine fracture$

Pointed reduction forceps and multi-toothed retractor during scapular fracture fixation

3. Retractors

Used to retract soft tissue and maintain surgical exposure.

Instrument	Description & Use
Hohmann Retractor	Angled retractor placed around bone to retract muscle; widely used in hip, knee, and fracture surgery.
Langenbeck Retractor	Handheld retractor for general soft tissue retraction.
Cobra Retractor	Curved retractor used around the acetabulum or femur in hip arthroplasty.
Taylor Retractor	Self-retaining spinal retractor for posterior approach surgeries.
Gelpi / Weitlaner Retractor	Self-retaining retractors for smaller incisions.
Fork Retractor	Multi-tined retractor for bone exposure (as seen in the image above).

⚠️ Note: Aberrant retractor placement is a recognized cause of neurovascular injury — e.g., peroneal nerve palsy in TKA and obturator vessel damage in hip arthroplasty. — Miller's Review of Orthopaedics, 9th Ed.

4. Drilling & Fixation Instruments

Used for creating holes in bone and applying implants.

Instrument	Description & Use
Power Drill	Used to create drill holes for screws, K-wires, and implant anchors. Small-diameter drills (3.2–4.0 mm) used for core decompression in AVN.
Drill Bits	Various sizes; must match screw diameter. Metal debris from drill bits can contribute to polyethylene wear in joint replacements.
Cannulated Drill System	Drilled over a guidewire for percutaneous and minimally invasive fixation.
Kirschner Wire (K-Wire) Driver	Drives thin K-wires for temporary or definitive fixation (e.g., CRPP for distal radius, pediatric fractures).
Tap	Creates threads in a drill hole before screw insertion.
Screwdriver	Hex or cruciate drives for insertion of cortical, cancellous, or locking screws.
Bone Tamp	Curved instrument used to impact bone graft or reposition bone fragments (shown below).

5. Implant Removal Instruments

Instrument	Description & Use
Shoulder Hook	Long slender instrument with a curved hook tip used to lever implanted plates off bone.
Curved Bone Tamp	Used with a mallet to dislodge implants or bone grafts that have integrated with fibrous/osseous tissue.

Shoulder hook (a) and curved bone tamp (b) for percutaneous implant removal

(a) Shoulder hook — slender metallic shaft with ball tip and curved hook end
(b) Curved bone tamp — wooden handle with curved flat metallic blade

6. Measuring & Alignment Instruments

Instrument	Description & Use
Caliper / Depth Gauge	Measures screw length after drilling.
Goniometer	Measures joint angles, used for alignment checks.
Cutting Jigs / Alignment Guides	Templates for precise bone cuts in arthroplasty (e.g., four-in-one cutting jig in TKA). Malposition leads to complications like femoral notching.
Trial Components	Temporary implant replicas used intraoperatively to verify sizing before definitive implant insertion.

7. Specialty Instruments by Procedure

Procedure	Key Instruments
Total Hip Arthroplasty (THA)	Cobra/Hohmann retractors, acetabular reamers, broaches, cup inserter, femoral rasp
Total Knee Arthroplasty (TKA)	Alignment rods, 4-in-1 cutting jig, tibial baseplate trial, gap balancer
Spinal Surgery	Pedicle awl, pedicle probe, nerve root retractor (Taylor), Kerrison rongeur
Fracture Fixation (ORIF)	Reduction clamps, lag screws, dynamic compression plate, locking plate system
Arthroscopy	Arthroscope, shaver, probe hook, basket punch forceps, cannulas

Summary Classification

Orthopedic Instruments
├── Cutting         → Osteotome, Saw, Rongeur, Curette, Gigli saw
├── Holding         → Bone forceps, Reduction clamps
├── Retractors      → Hohmann, Cobra, Langenbeck, Gelpi
├── Drilling/Fixation → Drill, K-wire driver, Tap, Screwdriver
├── Measuring       → Caliper, Goniometer, Cutting jigs
└── Implant-specific → Reamers, Broaches, Rasps, Trials

Sources: Miller's Review of Orthopaedics, 9th Ed. | Rockwood and Green's Fractures in Adults, 10th Ed.

Dhs plate

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DHS dynamic hip screw plate fixation intertrochanteric fracture

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Here is a comprehensive overview of the DHS (Dynamic Hip Screw) Plate:

DHS Plate (Dynamic Hip Screw / Sliding Hip Screw)

What is it?

The DHS plate — also called the Sliding Hip Screw or Compression Hip Screw (name varies by manufacturer) — is an extramedullary implant used to fix proximal femoral fractures. It was first developed in the 1950s and remains the gold standard for stable trochanteric (A1) hip fractures.

Components

The DHS construct has three main parts:

Component	Description
Lag Screw	Large-diameter cannulated screw inserted up the femoral neck into the femoral head. The serrated/threaded tip grips bone in the femoral head.
Barrel/Plate	Angled side plate with a cylindrical barrel at the top. The lag screw slides freely inside the barrel — this is the key "dynamic" feature.
Cortical Screws	3–4 screws fix the side plate to the lateral femoral shaft.

The barrel angle is typically 135° or 130° relative to the plate shaft. A lesser angle risks lag screw jamming; a higher angle causes a superior screw position with increased cutout risk.

Mechanism of Action (Why "Dynamic"?)

Unlike older fixed/static nail-plates (Jewett, Thornton, McLaughlin plates) where fracture collapse caused the screw to penetrate the hip joint, the DHS allows:

The lag screw to slide within the barrel as the fracture collapses
Controlled dynamic compression at the fracture site during weight-bearing
Fracture healing through impaction rather than fixation failure

DHS postoperative AP and lateral X-rays showing lag screw in femoral head with side plate fixed to femoral shaft

AP (a) and lateral (b) radiographs showing DHS fixation of an intertrochanteric fracture — lag screw in femoral head, 4-hole side plate fixed to femoral shaft

Indications

Indication	Notes
Stable intertrochanteric fractures (AO/OTA A1)	Primary indication — gold standard
Basicervical femoral neck fractures	Some surgeons prefer DHS
Undisplaced intracapsular fractures (Garden 1 & 2)	Used in younger patients (<60 yrs)
Subtrochanteric osteotomy fixation	With appropriate plate angle

Not recommended for:

Unstable A2/A3 fractures → prefer cephalomedullary nail
Reversed/transverse (A3) fractures → the DHS cannot allow longitudinal sliding; Medoff plate or nail preferred

Surgical Technique (Step-by-Step)

Patient supine on fracture table, traction applied
Fracture reduced under image intensifier (AP + lateral views)
5–7 cm lateral incision just distal to the greater trochanter
Divide fascia lata, reflect or split vastus lateralis to expose lateral femur
Insert guidewire using angle guide (135° most common)
- Position: central-to-low on AP, central on lateral
Measure guidewire depth → select lag screw length
- Tip should be 5 mm from subchondral bone of femoral head
- Not too far from joint → increases cutout risk
Tap femoral head bone (prevents rotation of head during screw insertion)
Insert lag screw — prevent femoral head rotation (place finger on anterior femoral neck or use anti-rotation pin)
Attach side plate to femur; insert cortical screws (usually 4-hole plate)
Ensure lateral end of lag screw is 5 mm from lateral side of barrel so initial sliding is within the barrel (avoids protrusion into soft tissue)
Close fascia lata → skin with absorbable subcuticular sutures + pressure dressing

Intraoperative fluoroscopy showing DHS lag screw guidewire placement in femoral head

Intraoperative fluoroscopy — guidewire position in femoral head with DHS lag screw at 135° neck-shaft angle

DHS X-ray Appearance

DHS AP radiograph showing lag screw, barrel, and side plate on femoral shaft

Classic DHS AP X-ray — large lag screw traversing femoral neck into head, angled barrel, side plate with 3–4 cortical screws

Modifications of the Sliding Hip Screw

Modification	Indication	Feature
Lateral Trochanteric Stabilizing Plate	Disrupted lateral femoral wall (A2 fractures)	Clips to side of standard DHS; resists femoral medialization; reconstructs greater trochanter
Medoff Plate	Reversed/transverse A3 fractures	Two interdigitating femoral plates allowing two-way sliding (along lag screw AND along femoral axis)

Complications

Complication	Cause
Screw cutout (most common)	Poor lag screw position (superior/peripheral placement); tip >10 mm from joint; varus malreduction
Screw jamming	Lag screw at too-low angle; screw tip too far from barrel end
Lateral protrusion of lag screw	Excessive fracture collapse; screw too far lateral in barrel initially
Femoral medialization	Unstable fractures without stabilizing plate
Infection / wound dehiscence	Higher risk in obese patients
Fixation failure / non-union	Unstable fracture pattern treated with DHS instead of nail

DHS vs. Cephalomedullary Nail

Feature	DHS (Sliding Hip Screw)	Cephalomedullary Nail
Best for	Stable A1 fractures	Unstable A2, A3, subtrochanteric
Implant position	Extramedullary (lateral plate)	Intramedullary
Load sharing	No (load bypass)	Yes
Reoperation rate	Higher for unstable fractures	Lower for unstable fractures
Surgical access	Lateral incision, more exposure	Smaller, minimally invasive

Sources: Rockwood and Green's Fractures in Adults, 10th Ed., 2025 | Grainger & Allison's Diagnostic Radiology

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