When hip pain becomes a reason to consider surgery

Persistent hip pain alone does not automatically indicate a need for surgery — and neither does an X-ray showing significant joint wear. The clinical threshold for hip arthroplasty requires both elements together: severe, ongoing pain that disrupts daily life, combined with imaging evidence of advanced joint deterioration.

On the imaging side, this typically means Kellgren-Lawrence grade 3 or 4 arthritis — described in everyday terms as 'bone-on-bone' contact within the joint, where cartilage has worn down to the point that the femoral head grinds against the acetabular socket. That structural finding alone is not enough to justify surgery if pain remains manageable.

On the symptom side, the bar is meaningfully high. Pain must be affecting activities such as walking, sleeping, driving, or dressing — or be present at rest — not simply uncomfortable with certain movements. When hip pain reaches the point where it limits these basic functions despite treatment, that is when the balance of risks and benefits begins to shift toward replacement.

Before that threshold is reached, surgeons expect conservative measures to have been genuinely trialled — typically physiotherapy, anti-inflammatory medications, steroid injections, and mobility aids sustained for at least three to six months without adequate relief.

Osteoarthritis is by far the most common underlying cause. Avascular necrosis, rheumatoid arthritis, and joint damage following a hip fracture are also recognised indications, each following the same essential two-part logic: structural deterioration plus pain and functional loss that conservative care can no longer control.

What a hip replacement assessment actually involves

A structured assessment typically unfolds across four areas: medical history, physical examination, imaging, and blood tests — each contributing a different piece of the clinical picture before any surgical decision is made.

Medical history covers the pattern and duration of hip pain, treatments already tried, and any systemic conditions that might affect anaesthetic risk or post-operative healing.

Physical examination assesses range of motion, gait, and functional capacity — how the joint moves under load, and where it fails. This hands-on component often reveals functional deficits that symptom questionnaires alone cannot capture.

Imaging begins with plain X-ray, which remains the standard tool for grading structural damage. MRI or CT is added where anatomy is complex, bone quality is uncertain, or soft-tissue detail is needed beyond what X-ray can show.

Blood tests establish a broader systemic baseline — relevant to anaesthetic suitability and the body's capacity to recover from a major procedure.

A patient's readiness and motivation to commit to post-operative physiotherapy is formally weighed alongside these clinical findings — not treated as peripheral to the decision.

At Hip Replacement Lincolnshire — part of the MSK Doctors group, with consultant-led clinics at Sleaford and Grantham — assessments are available without GP referral or NHS waiting lists. Where objective movement data adds clinical value, MAI Motion® gait analysis can form part of the pre-operative picture. The consultation is ultimately as much about understanding a patient's goals and expectations as it is about reviewing their scans.

How age, weight, and health conditions affect suitability

Three questions tend to dominate a patient's thinking before they even book a consultation: am I too old, am I the wrong weight, and will my other health problems rule me out? Each has a more nuanced answer than a simple yes or no.

Age

There is no upper or lower age limit. Hip replacement is most commonly performed in patients aged 60–80, but that range reflects epidemiology rather than exclusion criteria. Younger patients with severe, confirmed joint damage who have exhausted non-surgical options are valid candidates — and modern implants, in appropriately selected cases, may last well beyond 25 to 30 years. The clinical question is not how old the patient is but whether the damage, the symptoms, and the treatment history together justify surgery.

Weight

Elevated BMI — broadly above 30 to 40, with the threshold varying by surgeon and NHS trust — is not an absolute barrier, but it raises the risk of delayed wound healing and post-operative infection. Most surgeons ask for meaningful pre-operative weight management, both to reduce these risks and to support rehabilitation. The relationship runs in both directions: low BMI (below approximately 20) carries its own distinct risk, specifically an increased likelihood of post-operative dislocation. Weight, in short, is a risk modifier that informs surgical planning rather than a pass-or-fail criterion.

Medical conditions

Active infection is the sole absolute contraindication to hip arthroplasty. Poorly controlled diabetes, severe cardiovascular disease, and other unstable systemic conditions are relative contraindications — meaning surgery is deferred, not refused, until those issues are medically stabilised. How these factors combine in any one patient is not something population-level criteria can resolve; it requires examination, imaging review, and a direct conversation with the operating surgeon.

How the surgical approach connects to patient selection

Deciding whether to operate is one part of the clinical conversation; deciding how is another. The choice of surgical approach carries real consequences for recovery speed, dislocation risk, soft-tissue disruption, and post-operative movement precautions — and it is shaped, in part, by the same patient factors that inform candidacy in the first place.

Common approaches and their tradeoffs

The main routes to the hip joint each prioritise different things:

• Standard posterior approach provides good joint visualisation but requires detachment of the short external rotator tendons, which elevates dislocation risk and has traditionally necessitated hip-movement precautions for up to 90 days.
• Lateral (Hardinge) approach avoids posterior structures but involves splitting gluteus medius, which can affect gait and typically takes longer to fully recover.
• Anterior / DAA (direct anterior approach) works through a natural muscle interval and may support faster early recovery, but visualisation of complex anatomy can be limited and femoral preparation requires specific positioning equipment.
• SuperPATH is a short-incision posterolateral technique that aims to reduce tissue trauma while maintaining component positioning, though it carries a meaningful learning curve and is not universally available.
• SPAIRE — which Saves the Piriformis And Internus with Repair of Externus — is a muscle-sparing posterior technique informed by the clinical practice of Prof Paul Lee at Hip Replacement Lincolnshire. By preserving the key posterior tendons, it aims to lower dislocation risk without the soft-tissue trade-offs of the anterior or lateral approaches.

Approach selection is part of the patient assessment

No single technique suits every anatomy. BMI, prior surgery, hip geometry, and bone structure all influence which approach offers the best access and the most secure reconstruction. Patients who are younger, female, or have a low BMI already carry elevated dislocation risk; in those cases, tendon-preserving technique may carry particular clinical relevance.

Suitability for an enhanced recovery pathway — including earlier mobilisation and, in appropriate cases, same-day or next-day discharge — depends on how technique, implant, and individual health profile align. The approach discussion therefore sits inside the pre-operative consultation, not after it: a patient's anatomy and risk profile and the surgical plan are assessed together.

What well-selected candidates can realistically expect

Around 58% of total hip replacements are estimated to last 25 years, and modern implants — in appropriately selected patients — can support longevity exceeding 30 years. For someone who has spent months managing escalating pain, that figure reframes the calculation: surgery is not a stopgap but a long-term structural solution, and the timing of that decision matters.

The aspirational clinical benchmark is the 'forgotten joint' — a state in which patients go about ordinary daily life without consciously registering their prosthetic hip. It is not achieved by every patient, and no surgeon can guarantee it in advance; but it represents what the procedure is capable of delivering when the indication is strong and the surgical technique well-matched to the patient.

Rehabilitation plays a direct role in reaching that outcome. Recovery speed varies considerably: patients on an enhanced biological rapid recovery pathway may be discharged early, but structured physiotherapy and progressive loading remain part of the process regardless of approach. A patient who engages actively with that phase is more likely to arrive at the functional result both they and their surgeon are working towards.

The longevity statistics and functional benchmarks are population-level data points — useful for framing the decision, but not a forecast for any one individual. Bone quality, specific hip geometry, and the trajectory of joint deterioration all shape what a given patient can realistically gain. Those variables are precisely what a pre-operative assessment is designed to map.

Getting a suitability assessment without a GP referral

For patients who have worked through the questions in this article, a structured clinical assessment is the logical next step — one that covers the full picture: medical history, imaging review, physical examination, and a direct conversation about whether hip arthroplasty is appropriate now, or at all.

Hip Replacement Lincolnshire, part of the MSK Doctors group, accepts patients without a GP referral. Consultant-led assessments are available at clinics in Sleaford (NG34) and Grantham (NG31), where Open MRI and objective gait analysis can contribute to the evaluation without requiring separate appointments elsewhere.

Not every patient assessed will proceed to surgery. Where non-surgical options have not been fully exhausted, or where the clinical picture does not yet support arthroplasty, that assessment is delivered plainly. The aim is an accurate clinical answer, not a recommendation by default.

For most patients, knowing clearly where they stand — whether or not surgery is the conclusion — is the most useful thing a first appointment can deliver. Bookings are accepted directly, without referral, at hipreplacementlincolnshire.co.uk.