How Suture Choice Affects Muscle Healing After FHO Surgery in Dogs

FHO surgery in dogs removes the head and neck of the femur so that the pelvis and femur no longer meet in bone, and the muscles that remain around the hip carry the limb afterwards. Because the result depends on those muscles, the way the muscle, tendon and joint capsule layers are closed deserves attention, and the suture is part of that closure.

This article sets out what three veterinary sources say about the layers that are closed or repaired in the operation, which of them name a suture material, and where suture choice could matter. It also states a limit at the outset. No source reviewed measures how suture material changes muscle healing after FHO, so the Gexfix material comparison is reasoning from manufacturer data and not a finding from a trial.

What Is FHO Surgery in Dogs?

FHO surgery in dogs is the removal of the femoral head and neck, and VCA Animal Hospitals describes the operation as one that restores pain-free mobility by removing bone-on-bone contact in a diseased or damaged hip. VCA Animal Hospitals explains that scar tissue then forms between the acetabulum and the femur and creates cushioning between the bones. The page calls this a false joint, which is anatomically different from a normal hip but provides pain-free mobility in most patients.

A Clinician's Brief article by Laura Peycke, DVM, MS, DACVS, of Texas A&M University lists the indications as coxofemoral hip luxations, femoral head and neck fractures, catastrophic acetabular fractures, failed total hip replacements and chronic pain from hip degenerative joint disease. The guide to sutures in veterinary orthopedic joint procedures covers how sutures stabilise tendons and reinforce joint capsules in orthopedic work generally.

Femoral Head Ostectomy as Hip Surgery for Dogs

Femoral head ostectomy is one form of hip surgery for dogs, and it differs from the others because it removes bone and relies on the soft tissues instead of replacing the joint. The Clinician's Brief article lists failed total hip replacement among the indications, so it can also follow a failed implant. The Today's Veterinary Practice article by Clara Goh, BVSc, MS, DACVS (SA), of Colorado State University states that the ostectomy allows formation of a pseudoarthrosis made up of dense fibrous tissue.

Dog Dislocated Hip

A dog dislocated hip is one of the situations the owner information describes. VCA states that a hip that is out of the socket cannot be put back into place, and that many owners of small dogs choose FHO for this condition. The Clinician's Brief article lists coxofemoral luxation first among its indications.

How the False Joint Forms and Why Muscle Matters

The Clinician's Brief article states that muscle mass has been found to be one of the most important variables in determining the outcome. VCA makes the same point for owners, stating that the muscle mass a dog has built up through activity helps to stabilize the joint, and that inactive dogs have less muscle around the joint, which can mean less stability and longer recovery.

The complications listed in the Clinician's Brief article include decreased range of motion, especially abduction and extension of the hip, limb shortening and muscle atrophy. The Goh article says long-term muscle atrophy and decreased hip extension and weight bearing may occur, and that owner-reported satisfaction has historically been good to excellent. It also states that rehabilitation has been shown to be critical in a successful functional outcome. The surgeon's closure is therefore one input among several.

Which Layers Are Closed or Repaired

The sources are specific about which structures are repaired and almost silent about which suture is used. The table sets out what each source says.

Only the joint capsule has a material named. The Clinician's Brief article specifies 0 or 2-0 absorbable suture for any residual capsule over the acetabulum. The deep gluteal tendon, the vastus lateralis and the pectineus origin are repaired with mattress or simple interrupted sutures, and none of the sources states what those sutures are made of. The guide on choosing suture size based on tissue type and procedure explains how size follows the tissue.

How Suture Choice Could Affect Muscle Healing

What the Evidence Does Not Show

None of the three sources compares suture materials in FHO. They do not report whether a repair of the deep gluteal tendon or the pectineus origin with one material heals differently from the same repair with another. The claim that suture choice affects muscle healing therefore rests on how the repairs behave mechanically, and not on outcome data.

Tendon and Muscle Repairs Under Load

The deep gluteal repair and the pectineus reattachment are repairs of tendon and muscle attachments, and the limb is exercised early. The Clinician's Brief article states that passive range of motion and controlled activity should be explored within the first days after surgery. The Gexfix Product Reference positions PDS at about 180 to 210 days for fascia, tendons and slow-healing or high-tension tissue, with long tensile support and low tissue reactivity. The article on PDS sutures and tissue reactions explains how tissue responds to the material. Matching a long-acting monofilament to repairs of tendon and muscle attachments is reasoning from those figures, and it is not a tested result.

The Joint Capsule and Superficial Layers

The capsule closure is where the sources name a material, which is absorbable suture of 0 or 2-0. The Product Reference lists PGCL at about 90 to 120 days and braided PGA at about 60 to 90 days for soft tissue closures. The buried subcutaneous and intradermal continuous closure that Goh describes is covered in the guide to subcuticular suture technique.

Comparing Suture Options for FHO Closure

The Product Reference does not name FHO as an indication for any suture. The table sets the manufacturer properties beside what the FHO sources say about each material.

The table supports a narrow conclusion. Absorbable monofilament and long tensile support suit the load bearing repairs on the manufacturer figures, and the capsule closure has a named material class. None of this has been tested in FHO, and the table says so in its last row.

When Suture Choice Is NOT the Deciding Factor

Muscle Mass Before Surgery

Muscle mass is one of the most important variables in the outcome, according to the Clinician's Brief article, and inactive dogs have less of it. A suture cannot supply muscle that was lost before surgery. The Today's Veterinary Practice article advises against waiting until the patient has significant muscle atrophy and obesity.

Rehabilitation

Goh states that rehabilitation has been shown to be critical, with early work focused on pain, inflammation and protecting the surgical site and later work on hip extension and muscle mass. The Clinician's Brief article adds that swimming should be postponed until the incision has healed. VCA states that most dogs show signs of complete recovery approximately six weeks after surgery. These variables act on muscle healing independently of the material.

Soft Tissue Interposition

The Clinician's Brief article calls soft tissue interposition controversial, and its author writes that it may increase the chances of deep tissue necrosis and infection. A suture choice does not resolve a technique decision of that kind.

Choosing a Suture for FHO Surgery in Dogs

The sources show which layers are closed in femoral head ostectomy and that muscle is central to the outcome. They do not show that one suture heals muscle better than another. The reasoned choice is an absorbable monofilament matched to the load that each layer carries, with the technique and the rehabilitation plan treated as larger influences than the material.

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Sources

Clinician's Brief (Peycke L.E.), Femoral Head and Neck Ostectomy (2011). Peer reviewed procedure article by a board certified veterinary surgeon at Texas A&M University, with no sponsor or conflict disclosure on the page. Supports the indications, the closure of the capsule, the deep gluteal and vastus lateralis repairs, the muscle mass statement and the complications. The article is from 2011.

Today's Veterinary Practice (Goh C.S.S.), Ventral Femoral Head and Neck Ostectomy: An Alternative Approach to a Common Surgery (2024). Peer reviewed article by a board certified veterinary surgeon at Colorado State University, with no funding or disclosure stated on the page. Supports the ventral approach closure, the pectineus reattachment, the rehabilitation statements and the long-term muscle findings.

VCA Animal Hospitals (Barnes C., Weir M., Barnette C.), Femoral Head Ostectomy (FHO) in Dogs (last updated 2026). Owner information from a veterinary hospital group, with no separate reviewer listed. Supports the description of the false joint, the dislocated hip statement and the six week recovery figure.

Absorption windows, handling notes and infection field guidance come from technical data supplied by Gexfix International Corp. and Assut Europe S.P.A. and are manufacturer information.

FAQs

Q. What is FHO surgery in dogs and why does the closure matter?

A. FHO surgery in dogs removes the femoral head and neck, and the muscles around the hip carry the limb afterwards. The Clinician's Brief article states that muscle mass is one of the most important variables in the outcome, and the operation includes repair of the deep gluteal tendon, the vastus lateralis and, in the ventral approach, the pectineus origin.

Q. What is femoral head ostectomy used to treat?

A. The Clinician's Brief article lists coxofemoral hip luxations, femoral head and neck fractures, catastrophic acetabular fractures, failed total hip replacements and chronic pain from hip degenerative joint disease. The Today’s Veterinary Practice article also names Legg-Calve-Perthes disease and advanced hip dysplasia.

Q. Is FHO the right hip surgery for dogs with a dislocated hip?

A. VCA states that a hip that is out of the socket cannot be put back into place, and that many owners of small dogs choose FHO for a dog dislocated hip. The choice of hip surgery for dogs is a decision for the treating surgeon.

Q. How long is recovery after FHO surgery?

A. VCA states that most dogs show signs of complete recovery approximately six weeks after surgery. The Clinician's Brief article advises that passive range of motion and controlled activity be explored within the first days and that swimming wait until the incision has healed.

Q. Does suture choice change muscle healing after FHO surgery?

A. None of the sources reviewed compares suture materials in FHO, so the effect is not established. The sources name only 0 or 2-0 absorbable suture for the joint capsule. Muscle mass before surgery and rehabilitation afterwards are the variables the sources emphasise.